bluuebunny/crossref_metadata_2025 huggingface dataset:
The Practice and Cognition of Tracing with Drilling in Fish Bone Horizontal Well
Authors: Yu Kai Chun , Zhu Yan , Li Xiao Xing , Zhang Shi Feng
Published: November 2012

The branch well G8-33-H1Z is the first fishbone horizontal well of Daqing. The fishbone horizontal well is one type of the branch horizontal wells, which drilling again two or more branch holes in the horizontal section of the horizontal well. This well lies in G21 block where is near to the west of Daqing oilfield Changyuan area and the northeast of G20 of the north Gaotaizi oilfield. The purpose of the drilling is using branch horizontal well to control more areal reserves and increasing drainable area to improve well production. This technique can improve the economic benefit of oilfield development, which saves drilling investment, makes full use of the upper borehole to improve the comprehensive exploitation degree of the reservoir and achieves highly efficient development using less well. This well has two horizontal branches, and puts ‘trunk-branch-trunk-branch’ into effect while drilling. The first branch designed horizontal length 150m. The second branch designed horizontal length 150m. This paper introduced the tracing with drilling process of Daqing first fishbone horizontal well, and also described the complex situations and the treatment methods while drilling wellbore trajectory and constructing well and the development effect. Finally some suggestions were put forward about tracing with drilling in fishbone horizontal well.
On Analysis Economic Loss Appraisal Method for Geological Disasters
Authors: Li Shi Gui , Yi Qing Lin , Wu Juan Juan
Published: November 2012

China is one of the most serious national which does harm to geological disasters, and the geological disasters have effect on China’s economy. Therefore, the effective evaluation for the economic losses caused by geological disasters has some reference value. This paper mainly introduces the geological disaster economic losses structure drawing and evaluated methods which include human capital method, shadow valuation method, market valuation method, investigation appraisal method and coefficient of proportionality method, and analyzes different economic losses should adopt different appraisal method. And take the Qianjiangping landslide for instant, this paper introduces how to evaluate landslide disasters economic loss. The idea and method have certain guiding significance to geological disaster economic losses evaluation.
Discussions on Zonal Disintegration around Tunnel in Deep Rock Mass
Authors: Jia Peng , Yang Tian Hong , Zhang Chun Ming
Published: November 2012

Questions related to zonal disintegration such as difference between results from laboratory test and field monitoring test, as well as the effect of multi-axial stress level on zonal disintegration were discussed through numerical modeling by using a 3D numerical code called RFPA3D. Results show that the much smaller fracture spacing captured by laboratory test on zonal disintegration is due to the heterogeneity extent of the tested material. Zonal disintegration is an inherent character of heterogeneous rock mass, the more the heterogeneous the rock is, the larger the spacing between the adjacent fractures will be. The configuration of zonal disintegration is influenced by combination of stress level in three directions. Intact fracture rings can not be formed unless a nearly hydrostatic stress state exists in directions perpendicular to tunnel axis.
Characteristics and Mechanics Analysis of Debris Flow Disaster in Xinjiang Arid Area
Authors: Lv Li Qun , Chen Ning Sheng , Lu Yang , Huang Qi , Li Jun , Zhu Yun Hua
Published: November 2012

Xinjiang arid area is characterized by low rainfall, strong evaporation capacity, sparse vegetation, intensive tectonic movement, and fragile ecological environment ; the rainfall-type debris flow in the arid area are obviously different from the same type debris flow in humid and subhumid area of China with conditions of rainfall excitation, watershed morphology, motion and deposition processes, material composition, active period and disaster mechanism. Investigations and analyses of characteristics of rainfall-type debris flow in the arid area will reveal the rule of the occurrence and development and explore the evolution trends, to establish reasonable disaster reduction measures. Qiaoquli gully located in Kashgar is a typical arid area rainfall debris flow gully. The 50-year frequency outbreak of debris flow in 2005 destroyed chinapakistan highway . Further investigation to this debris flow gully will contribute to our understanding of this kind of debris flow disaster characteristics and mechanism.
Experiment Study on the Relationship between the Height of Capping Layer and the Porosity of Broken Rocks
Authors: Du Cui Feng , Li Bin
Published: November 2012

The gas seepage characteristics of four kinds of broken rocks of different gradations and the relationship between the capping height and the porosity were studied by means of the simulation experiment and the theoretical analysis. The results show that the air flow in the capping layer composed of broken rocks is in the non-Darcy state which can be described as Forchheimer equation and Ergun equation. Moreover, on the basis of the experimental data, the relational expressions between the permeability, the non-Darcy β factor and the porosity were determined. Through the numerical fitting, the equation of the minimum capping height and the porosity was ultimately derived, which provided the basis and the reference for the determination of capping height and the air leakage control of mine.
3D Modeling of Building Based on CSG and SketchUp
Authors: Wang Yan Bing , Zheng Mei Xia , Li Xiao Juan
Published: November 2012

3D modeling of city has become a hot research topic in the field of GIS, it has very important significance in terms of urban construction, management and planning. Building model is an important sector of 3D city model, after analyzing the traditional algorithm of building modeling, a combined algorithm based on CSG and SketchUp is proposed in this paper. Using CSG model, the regular buildings are constructed firstly, then using SketchUp software, the irregular buildings are constructed. Finally, all building models are combined into a continuous building. The paper uses parts of the actual data to verify the feasibility of this modeling approach in the paper.
Application of GPS-RTK Technology in the Measurement of Discontinuity Traces
Authors: Zhang Yang Song , Li Ruo Yao , Wen Fan
Published: November 2012

Rock discontinuities appear as traces on exposures such as natural outcrops or tunnel walls. Discontinuity size which has important effects on rock mass behavior such as rock mass strength, deformability, stability, fluid flow, contaminant transport is related to trace length. Field linear and areal sampling techniques are time-consuming and low accuracy. Real-Time Kinematic GPS (GPS-RTK) developed from GPS is a more secure and fast way, which has some advantages of shorter observation time, high positioning accuracy, unnecessary intervisible and direct result of exact coordinate in field. This paper uses GPS-RTK technology in the measurement of discontinuity traces in Beishan granite rock mass of Gansu province. Through analyzing the processing and results acquired from Beishan granite rock mass discontinuity traces, the paper tries to demonstrate the feasibility and practicality of the method.
Analysis of Landslide Surface Deformation Using Geographically Weighted Regression
Authors: Huang Hai Feng , Yi Wu , Yi Qing Lin , Zhang Guo Dong
Published: November 2012

Traditional regression analysis methods such as Ordinary Least Squares (OLS) are usually used to explore data relations, but they cannot reflect the spatial non-stationarity of the data. Geographically Weighted Regression (GWR) is an effective tool for dealing with this situation, whereas there has not any related studies about using GWR to analyze the landslide surface deformation. This paper tries to base on a typical reservoir-type landslide in Three Gorges Reservoir area of Yangtze River, China, and uses monitoring data, to build OLS and GWR model between landslide surface displacements and trigger factors by ArcGIS. Analysis showed that the GWR model has greater R2 and smaller Akaike information criterion (AIC) value, and the residuals spatial autocorrelation degree can be significantly reduced then the OLS model, what means the GWR model can capture the spatial non-stationarity of independent variables and is more reliable in analysis of landslide surface deformation.
Evacuation Simulation Model for Large Hotel Based on GIS
Authors: Cai Fei , Cui Jian , Ma Dong Ling , Li Jin
Published: November 2012

To meet the requirements of emergency evacuation in a large hotel, this paper introduces design and implementation of emergency evacuation simulation model for a large hotel based on GIS in detail. Firstly, the design of the simulation model is introduced in the paper. Four-tier framework of the model is composed of user layer, application layer, underlying support layer and data layer. Secondly, the key technologies of the model are emphasized. The spatial analysis and attribute data analysis of GIS are used to determine evacuation zone of emergencies and disasters in a large hotel and achieve the optimal emergency evacuation plan for crowd. Finally, test results showed the model improves the simulation precision and can provide effective service for emergency evacuation in a large hotel.
Study on Heating Zone and Producing Zone of Cyclic Steam Stimulation with Horizontal Well in Heavy Oil Reservoir
Authors: Huang Shi Jun , Hu Ping , Li Qiu
Published: November 2012

In this paper, employing reservoir simulation and mathematical analysis methods, considering typical heavy oil reservoir and fluid thermal properties, the heating and producing shape of thermal recovery with horizontal well for different heavy oil reservoirs including ordinary, extra and super heavy oil are investigated based on the modification of thermal recovery parameters of different viscosity. By introducing heating radius and producing radius and considering the coupling effect of temperature, pressure and oil saturation fields, a quantitative expression between heating radius/producing radius and oil viscosity, formation thickness is presented, so is the impact of oil viscosity on the heating radius. Results shows that for Cyclic Steam Stimulation, the producing radius of horizontal well is bigger than its heating radius for light oil, both of which, however, shrink with higher viscosity. Beyond a critical viscosity, where the heating radius equals to the producing radius, the heating radius of horizontal well would be bigger than its producing radius. More over, the critical viscosity shows tight relationship to the formation thickness.
The Characteristics of Seepage Field and Numerical Analysis on the Stability of Reservoir Landslide
Authors: Tang Xiao Song , Zheng Ying Ren , Wang Yong Fu
Published: November 2012

The stability of reservoir landslide would be influenced obviously by the fluctuation of water level, especially when the water descends, which is different from common landslide. Due to the unsteady seepage of underground water inside slope caused by the change of water level, the stability analysis of reservoir landslide through fluid-solid coupling is very complicated. At present, most people hold the view qualitatively that the less the permeability coefficient is and the faster the water level changes, the more unfavorable it is to the stability. This view lacks quantitative basis. Based on FEM strength reduction, the paper analyzes the influence of different sets of descending speed and permeability coefficient on the stability of reservoir landslide through fluid-solid coupling analysis. The paper also conducts the relevant analysis on the change of the characteristics of seepage field inside the slope, which provides basis for the study of the failure mechanism and the forecast of reservoir landslide.
The Application Research on the Elastic-Flexible Anchor in the Retaining Wall
Authors: Gao Lin , Shi Yan , Xu Guo Qiang
Published: November 2012

The anchor which added a elastic-flexible deformable body on the common anchor will be form a new type anchor, it is called the elastic-flexible anchor. With the help of FLAC3D 3.0, we compared the numerical simulation analysis results between the common anchor and the elastic-flexible anchor. we obtained that, the elastic-flexible anchor has the higher bearing capacity and more excellent anti-deformation performance, this mainly due to the elastic-flexible deformable body which has the buffering effect of the stress and deformation. The results confirmed the elastic-flexible anchor especially applied to the support structure with the requirements of large deformation and dynamic load, and worth popularizing in the anchor retaining wall engineering.
Sectional Optimization Study on Perforation Parameters of Horizontal Wells in DaQing Oilfield
Authors: Zhang Hai Jun , Yang Zhi Zhong , Guan Peng Ju , Xu Guo Ping , Fu Li , Li Hong Yan , Xu Lei
Published: November 2012

A coupled model for horizontal wells with perforation completion was built by combing the flow models in reservoir and wellbore. Then used the genetic algorithm to determine the flow rate and pressure distribution along the wellbore. The influence of the length and position of the perforation section to the production ability was also studied. The partition perforation optimization technique can uniform the inflow profile along the horizontal wellbore, prolong the develop cycle, and increase the development benefit.
The Research of Layer System Adjustment Methods in DQY103 Block of the Low Permeability Reservoirs
Authors: Yang Tie Jun , Liu Chun Lin , Fu Chun Quan , Zhang Jun Ting , Yin Hong Jun
Published: November 2012

In order to ease the contradiction between layers, layer system adjustment is applied in oilfield development and separated layer water flooding is realized better. This method is a major adjustment measure to improve development effects. DQY103 is a typical low-permeability oilfield and physical property is poor. Many problems are existed, such as apparent contradiction between layers, and poor development effects and so on. In this article, the physical property and thickness of barrier, injection profile, permeability contrast and remaining oil distribution are analyzed comprehensively. A reasonable method is also proposed. Much weakness which exists in the former methods is overcome. For example, factors are not comprehensive and accurately reflected. Poor thin layers are produced better. Invalid water injection and contradiction between layers are decreased. Development effects are improved eventually. It is a reference and guidance for other blocks which exists the same problem.
Numerical Simulation Study on Diamond-Shape Inverted Nine-Spot Well Pattern
Authors: Wang Sheng Peng , Yu Rong Ze , Bian Yan An
Published: November 2012

A newly derived nonlinear flow numerical simulator was used to study on the diamond-shape inverted nine-spot well pattern based on laboratory experiment and actual field data. The optimum artificial fracture penetration ratio, flow conductivity, and condition of converting the corner-wells to injection wells were presented on the basis of 37 concept model well plans. Finally, the formation pressure gradient distributions of different well plans were provided and analyzed.
Numerical Study on Mechanical Response of Steel Wire Wound Reinforced Rubber Flexible Pipe under Internal Pressure
Authors: Gu Fan , Wang Hui Xin , Sun Li
Published: November 2012

According to the actual structure of steel wire wound reinforced rubber flexible pipe, using the finite element software ANSYS, 3-D finite element model of flexible pipe is established. For the mechanical response of flexible pipe under internal pressure, the comparison on the result by numerical calculation, the static loading test and the result by analytic method shows that the 3-D finite element model of flexible pipe is rational. Moreover, based on the finite element model of flexible pipe, the influence of internal pressure, spanning length and reinforced steel wire diameter on the axial stress of the innerest steel layer and the Mises stress of the innerest rubber layer is analyzed.
On the Investigation of Flow around the Square Cylinder Based on Different LES Models
Authors: Liu Zhe
Published: November 2012

Although the conventional Reynolds-averaged Navier–Stokes (RANS) model has been widely applied in the industrial and engineering field, it is worthwhile to study whether these models are suitable to investigate the flow filed varying with the time. With the development of turbulence models, the unsteady Reynolds-averaged Navier–Stokes (URANS) model, detached eddy simulation (DES) and large eddy simulation (LES) compensate the disadvantage of RANS model. This paper mainly presents the theory of standard LES model, LES dynamic model and wall-adapting local eddy-viscosity (WALE) LES model. And the square cylinder is selected as the research target to study the flow characteristics around it at Reynolds number 13,000. The influence of different LES models on the flow field around the square cylinder is compared.
Study on Collision Damage Behavior of Ship
Authors: Lü Yan Song , Mei Zhi Yuan
Published: November 2012

Ship collision is a kind of dangerous accident which may result in serious damage of struck hull structure during shipping process. The damage of ship depends on the relative rigidity of striking ship and the capabilities of crash resistance of ship structures. The rigidity of bow is always considered as higher than that of side, so the structure of bow is regarded as rigid body. But this method is so conservative that the result of numerical simulation may be wrong when the rigidity of side of one ship is higher than that of bow of another ship. The process of collision of two ships is simulated, in which the structures of two ships are all defined as elastic body. The behavior of side is studied and some useful results are found.
Bifurcation Phenomena of Secondary Flows in Curved Duct of Square Cross-Section
Authors: Xue Lei
Published: November 2012

Based on the flow model and its mathematical description in curvilinear coordinates, the steady and fully developed laminar flow in the curved pipe of square cross-section was simulated by the Galerkin method. The results show that the eye points of the secondary flow vortex at low Reynolds numbers almost locate at the position of 0.457 on the vertical axis, the axial velocity maximum shifts inward or outward when the pipe curvature parameter and flow conditions change. Furthermore the bifurcation flow is studied to draw the bifurcation state diagram, and the Reynolds number corresponding to the bifurcation point of the four-vortex solution is accurately equal to 300.1.
Additional Stress Distribution in DJM Pile Composite Foundation and Simplified Calculation Method
Authors: He Fang Ding , Guo Guang Jun , Wu Jian Qing
Published: November 2012

Although DJM-Pile have a good effect on strengthening soft foundation,theories about additional stress are too complex or too simply to be used in project well.By adopting FEM software with considering of friction between soil and pile,simulate the additional stress in composite foundation because of DJM pile construction and compare with results gotten in Bossinesq method.The comparison shows that the distribution of additional stress is very similar.So considering several major influential factors,the paper updates the Bossinesq method and brings forward a simplified calculation method.
Nonlinear Buckling Behavior of Cylindrical Shells of Uniform Thickness under Wind Load
Authors: Chen Lei , Peng Yi Liang , Wan Li , Li Hong Bo
Published: November 2012

Abstract: Cylindrical shells are widely used in civil engineering. Examples include cooling towers, nuclear containment vessels, metal silos and tanks for storage of bulk solids and liquids, and pressure vessels. Cylindrical shells subjected to non-uniform wind pressure display different buckling behaviours from those of cylinders under uniform external pressure. At different aspect ratios, quite complex buckling modes occur. The geometric nonlinearity may have a significant effect on the buckling behavior. This paper presents a widely study of the nonlinear buckling behavior of cylindrical shells of uniform thickness under wind loading. The finite element analyses indicate that for stocky cylinders, the nonlinear buckling modes are the circumferential compression buckling mode, which is similar to cylinders under uniform external pressure, while for cylinders in mediate length, pre-buckling ovalization of the cross-section has an important influence on the buckling strength.
Research on Constructing 3D Geological Model of the Construction Layers in Daxing New City Area of Beijing
Authors: Huang Xiao , Chen Gang , Li Zhe Lin
Published: November 2012

The new city in Daxing district is the focus of future development in the southern of Beijing city, establishing 3D geological model of its engineering construction layer can provide a scientific basis for urban planning and construction as well as the land’s proper utilization. After collecting the geological drilling data, we establish the geological model based on a 3D geological modeling platform developed by Peking University. The 3D spatial modeling method based on sections is used to analyze two key technical problems about simulation process named high-precision modeling and rapid modeling respectively. In the modeling process, Delaunay triangulation and Kriging interpolation algorithms are used. Furthermore, the manual intervention is achieved through the use of flexible and convenient 3D interactive modeling tools. The application examples indicate that the 3D geological model constructed by this method can better reflect the actual situation, it also possesses the advantages of high precision and fast modeling.
Application Study of Landscape Design Based on Visual Authenticity and Intellectual Authenticity
Authors: Liu Can , Yang Xue Song
Published: November 2012

Design works not only bring visual perception, but also are a thought-provoking process. Visual perception is a part of perception and the image generated by visual signals makes what the design works convey rich and complete. This paper can get the concepts of visual authenticity and intellectual authenticity from Art and Visual Perception written by Arnheim, elaborates the practical application of landscape design by doing research on the connotation of visual authenticity and intellectual authenticity and comparatively analyses the characteristics of visual authenticity and intellectual authenticity from three aspects ( including sensory authenticity and image authenticity, direct process and guiding process and ornamentation and interestedness ) and the correlation between visual authenticity and intellectual authenticity and landscape to make the landscape design perfect.
Research on the Commercial Environment of China’s High-Tech Districts: The Integration of City Function and Innovation Function
Authors: Wang Chun Lei , Wang Xia , Ma Miao Ming
Published: November 2012

This essay studies the problems and reasons of Commercial Environment in China’s High-tech Districts from City Function and Innovation Function. It is hardly to solve these problems only consider City Function or Innovation Function respectively. By investigation and study, bottleneck could be broken by digging the need of Commercial Environment, and the integration of City Function and Innovation Function.
Analysis of Safety and Risk Factors about the Tailings Dam in the Mental Mines
Authors: Ju Hai Yan , Gao Gui Qing , Li Qiu Xiang , Li Jian Hua
Published: November 2012

Tailings dam is a potential risk source in the metal mines, once the tailings dam break, it will not only lead to tremendous loss in people’s lives and property, but also result in serious environmental pollution. Basing on the accidents of tailings dam failure at home, the dam failure causes are analyzed, some technology and management suggestions about decreasing dam-break accident are put forward, which provide reference for safety management to tailings dam.
Management Mode of Super Large Scale Project - Case as Chongqing Public Rental Housing
Authors: Zheng Cai Gui , Yuan Dao Xian , Yang Qing Yuan , Zhang Xiao Cheng , Li Shi Chuan
Published: November 2012

Traditional project management models have been difficult to adapt to the requirements of the organization and management for very large projects. Chongqing which has the moderate economic strength is first progress and the most smoothly in large-scale construction of public rental housing in the country. Therefore, the model and experience of the management of large projects from public rental housing construction in Chongqing has important theoretical and practical significance. The paper demonstrates that the model of government-led making decision, specifically management department managing, the state-owned enterprises as the owners making land reserves and managing investments and financing (GMS mode) has a higher efficiency on the management of large construction projects, can effectively solve the problem of multi-participant, short construction period and high security requirements. If taking into account the public participation making the GMS mode into GMSP mode, the management of large projects can better incorporate the efficiency and fairness.
Research on Gradual Deformation and Fracture Mechanism of Landslide by Model Test
Authors: Wang Yong Gang , Ren Wei Zhong , Ding Wen Qi
Published: November 2012

To study the gradual deformation and fracture mechanism of landslide, taking Han Jiaya landslide as the prototype, the laboratorial geo-mechanical model test with geometric similarity ratio 1:200 was carried out with several different materials to simulate corresponding rock layers and structure. By applying the digital close range photogrammetry, the deformation and fracture mechanism of the landslide under natural and excavating conditions are deeply analyzed. Comparing the results of model test with field monitoring analysis, the model test can quantitatively and qualitatively analyze the deformation and failure mechanism of the landslide by relatively accurate means. The landslide has been in good condition since this controlling engineering was completed several years ago. The study results provide an effective scientific basis for the prevention and treatment of the landslide.
Research on the Theory and Application of River Course Regulation Projects’ Post-Economic Evaluation
Authors: Li Xiao Ying , Chu Min , Ge Fei
Published: November 2012

Effect of the continuous development of economy and society, and changes in water regime and hydraulic structure behavior, the post-economic evaluation on water conservancy project is necessary. By which experiences and lessons can be learned from the river course regulation project under operation, project management and decision-making at all levels can be improved. At the same time, engineering under operation can play better efficiency, and the construction work in progress and projects to be built can be guided through the appraisement. It is proved by example application.
Quantitative Relationship Model and Case Study on Technological Progress and Industrial Structural Optimization of China's Construction Industry
Authors: Guo Hui Feng , Li Peng Wei , Wang Ting , Yang Yun
Published: November 2012

The paper focuses on the quantitative relationship between technological progress and industrial structural optimization of China's construction industry. In first, the relational model of technological progress and resource allocation of construction industry is established. And then the relational model of technological progress and industrial structure of construction industry is also set up. In the last, a case study on the structural flexibility of technological progress of China's construction enterprises of various ownership types in 1997-2007 is completed.
Alternative Selection of Expressway in the National Nature Reserve
Authors: Gao Jian Ping , Zhang Xu Guang , Zhang Zhuo , Wu Guo Xiong
Published: November 2012

Since the alternativened Baoshan-Tengchong expressway happens to be within the influence scope of Gaoligong Mountain National Nature Reserve. By choosing ten evaluation indexes from the three aspects of economy, environmental impact and operation safety, a route alternative evaluation index system is established in the light of two route alternatives of Baoshan-Tengchong expressway put forward in the engineering project feasibility study stage, namely, the super long tunnel directly passing through the mountain alternative or bypassing it along the existing expressway alternative. Moreover, a expressway route alternative model for comparison and evaluation is built through application of set pair analysis theory and the analytic hierarchy process. By comparison, the bypassing alternative is finalized for, in spite of the increase of 15.28 kilometers from Baoshan to Tengchong compared to the other alternative, it can better reduce the influence on the nature reserve exerted by the construction and operation of the expressway and turn out to be more beneficial in the long run.
Geotechnical Engineering Control on the Scenic Area — Research on the Method for Geological Disasters-Rockfall, Landslide and Debris Flow in Laoshan District of Qingdao
Authors: Zhang Yong Wei , Li Shu Cai , Chen Xu Guang , Xu Wei
Published: November 2012

Compare with the other area, the geo-disaster control in scenic area is of specific, for it has the functional properties of fill the need of tourist of people. So the starting point is to protect the Ecological environment of scenic area. Most of the Chinese scenic areas locate on the mountain area and gully etc, which is the area with much geo-disaster. The geo-disaster controls on the scenic area getting more and more attention. In order to carry on the corresponding research， the Laoshan area in Qingdao City is taken as the engineering background, the geo-disaster control pattern is explored. The Laoshan area suffered rockfall, landslide, debris flow sometimes. There were casualties and property damage. On the basis of reconnaissance and risk analysis of geological disasters, Geotechnical Engineer controlling for typical geological disasters-rockfall, landslide, debris flow can get rid of the potential geological disasters and protect people's lives and property in Laoshan District. The geo-disaster control pattern solved the hidden danger in Laoshan scenic area, and it provides some experience for the geo-disaster control of other scenic area.
Analysis of One-Dimensional Thermal Consolidation of Saturated Soil with and without Thermo-Mechanical Coupling
Authors: Shen Xue , Wu Rui Qian
Published: November 2012

Based on a one-dimensional thermal consolidation formulation with and without thermo-mechanical coupling of saturated porous medium, problems of one-dimensional thermal consolidation of saturated soil were investigated. For the condition with instantaneous constant surface temperature and uniform initial pore-pressure, analytical solutions of excess pore-water pressure and temperature increment were derived respectively by the method of finite Fourier transform and inverse transform. A relevant computer program was developed, and the excess pore-water pressure was compared in detail. The results show that the thermo-mechanical coupling item in the thermal consolidation equation can be ignored.
The Evaluation of Surrounding Rock Stability around Underground Engineerings Based on Improved Extension Evaluation Method
Authors: Zhang Suo Juan , Qiu Guo Qing , Xie Wen Bin , Qi Xiu Li , Ao Zhi Guang , Huang Ying
Published: November 2012

Combined with the research of the stability grade of surrounding rock, this paper put forward into the extension method on surrounding rock stability around underground engineerings with extension theory. The extension method was improved the value of the limited field, the correlation function and weights coefficients to establish the stability evaluation method. The method was successfully applied into the underground engineering case, which has provided scientific reference for design and construction of underground engineerings.
Primary Study on Mechanism of Earthquake-Induced Differential Settlement of Buildings on Liquefiable Subsoil
Authors: Meng Fan Chao , Yuan Xiao Ming , Xue Hui
Published: November 2012

The shaking table test on liquefied soil - structure interaction was desighed. In the test, the building model and the soil were evenly arranged, after being put horizontal sine wave acceleration time history, building symmetrical basal dynamic stress, pore water pressure and earthquake-induced settlement time history were obtained. The results are: (1) symmetrical basal vertical dynamic stress, pore water pressure, earthquake-induced settlement reaction time history appeared antisymmetric distribution; (2) basal dynamic stress is controlled by the input waveform, the basal vertical dynamic stress plays a decisive role in the increase of the pore water pressure, while difference of pore water pressure decides difference of earthquake-induced settlement, which causes the building tilts toward the direction of higher pore water pressure; (3) a correlation exists among input wave, basal vertical dynamic stress, pore water pressure and structural earthquake-induced settlement. The mechanism of earthquake-induced settlement is: acceleration waveform  form of both sides basal dynamic stress cumulative form of both sides basal pore pressure form of earthquake-induced settlement.
Numerical Analysis on Effect of Rock Rheology on Fully-Grounded MFRP Bolt Stress
Authors: Li Juan , Zheng Bai Lin
Published: November 2012

As to the time effect of prestress in bolt in geotechnical engineering, the stress distribution in fully-grounded MFRP bolt and its trend influenced by rock rheology is obtained by FEM. The Burgers body which is able to model the primary and secondary creep regions of the rock mass is applied to analyze the time effect of prestress in MFRP bolt. The results show that rock rheology has a great effect on MFRP bolt stress.
Research on Similar Material of Physical Model for Bai Jiabao Landslide
Authors: Yang Yun Hua , Cheng Sheng Guo
Published: November 2012

Based on the Bai Jiabao landslide model test, the landslide’s similar materials are studied.According to the similar criterion theory , the methods of uniform design and orthogonal design are used to determine the ratio of materials. The results is showed that the similar materials of the heavy grain of sand, the heavy crystalline powder, the river sand, the flour, silty sand have the similar physical properties with the Bai Jiabao Landslide and that they are used as materials to simulate the landslide in the model test are suitable.
Study on Stability of Dayantang Landslide under the Engineering Disturbance and Rainfall
Authors: Zhou Jian Jun , Deng Hua , Peng Hao
Published: November 2012

Dayantang slope was stable before Shuibuya project construction. Based on the long-term safety monitoring, it has appeared the obvious deformation during the project construction. According the monitoring datas, the stability of the landslide before and after the construction was discussed and analyzed. Considering the rainfall effect on landslide after it has been strongly anthropogenic disturbance, the numerical results show that it is in critical steady state without rainfall, while get worse and even unstable failure under the influence of the intensive rain and the long period of rainfall.
Research on Engineering Geology Properties of Residual Diorite in Jinan, Shandong Province, China
Authors: Shang Min , Xu Qiang , Li Shu Cai , Zhang Lan Xin
Published: November 2012

Residual soils are weathering products of rocks that are commonly found under unsaturated conditions. Residual soil is one of special soils, and its engineering geology property is usually different because of the difference of resource rock type, the geology environment and weathering condition. By the means of analysis of the data attained by the methods of field exploration, laboratory test and testing in-situ, the physical and mechanical properties of the residual diorite in Jinan were studied deeply. It is proved that the stratigraphic section of the soil can be classified as two layers on the perpendicular direction. Considering the inhomogeneity of the residual soil mass and the widely divergence of the value of mechanics properties, the suggestion value of c, Φ , a, Es, fak were put forward for further guiding the engineering practice , on the base of physics and mechanics properties tests and the region practice experience. At the same time, it is pointed out that, at that region, the interlayer and inhomogeneity of the weathering layers should be emphasized in the process of projecting and constructing when the residual diorite acts as the foundation of the construction or one of the geologic layers.
Slope Protection with Vegetation for Waste Dump at Guangyue Road in Shanghai
Authors: Xu Yi Wei
Published: November 2012

The Waste Dump at Guangyue Road in Hongkou district locates in the center of Shanghai and became a success stories for it being transformed Waste Dump into a resort. However, slight landslide on the Waste Dump occurs frequently whenever the typhoon and dramatic storm happened in recent years. Meanwhile the slope protection with vegetation is becoming the most common, efficient and most practical way for conserving water and soil and keeping slope stable. This article descripts the mechanism of slope protection with vegetation and analyses the actual situation of the Waste Dump at Guangyue Road and discusses how to reasonably apply the mechanism of slope protection with vegetation into ameliorating the landslide situation on the Waste Dump.
Model Experimental Research of Double-Sided Reinforced Earth Retaining Wall
Authors: Su Jun , Yang Xiao Qiang
Published: November 2012

Double reinforced earth retaining wall belongs to flexible structures, so it adapts well to soft foundation deformation. Compared with other forms of retaining wall, double reinforced earth retaining wall is more economic. An experimental study was conducted to assess the earth pressure on the facing of double-sided reinforced earth retaining wall, and its fundamental mechanism was researched. The results indicate that the horizontal earth pressure on the back grows with the increase of the thickness of the filled soil, its value was between active earth pressure and static earth pressure, the strain of the metallic bar increases with increasing load, It was non-linear distribution along the length of the metallic bar. The results providing a basis for design, theoretic analysis and engineering application.
Study of Dynamic Coordinates Time Function in Mine Subsidence
Authors: Guo Ying , Zhu Guang Yi , Jiang Xin Liang , Dou Ming
Published: November 2012

According to hot research of subsidence time function at home and abroad in recent years that there are commonness of less parameters and difficult to extended reflecting surface subsidence characteristics in the dynamic process, the surface subsidence dynamic coordinates time function were proposed based on the probability integration principle, established the calculation methods of surface dynamic process, anal sized the applicability and limitations of the dynamic time function and verified some examples. The results show that the function is more accurate than the Knothe time function in analyzing the actual regularity of surface subsidence caused by underground mining, reflecting the dynamic characteristics of surface movement in real time, interoperating mining phenomenon, it is more accurate to predict dynamic ground displacement and deformation which has a certain significance value in mining design and subsidence disaster management.
Theory of Temperature Dynamic Control in Arch Dams and its Application
Authors: Duan Yin , Liu Xing Hong , Chang Xiao Lin
Published: November 2012

Main factors of the temperature control and crack prevention in arch dams are summarized. The Space-time Dynamic Control method in pipe cooling process and the Temperature Real-time Control and Decision Database System are introduced to help for temperature real-time control and rapid analysis. Successful application of these new techniques in the construction of Dagangshan arch dam indicates that the proposed method are of significant effectiveness on the temperature control and crack prevention, and have good application prospect in practical project.
Calculation of Temperature Rise of Mass Concrete and Modification of Formula
Authors: Hu Yu Ming , Liang Chuan
Published: November 2012

With the continuous improvement of China’s construction technology, the application of mass concrete structures is increasingly popular in various structures in order to meet the requirements of structure and function, such as tall buildings, dams, railways and highways. There are all kinds of cracks in construction process because of the big cross section. There are many reasons to form cracks, but temperature is the most common cause. It is vital to the construction quality of mass concrete that the hydration heat, especially the peak value of temperature rise, is calculated in advance and precautions are implement in construction process accordingly. In this article, the calculation formula modified is derived through analyzing the common calculation formulas of mass concrete, the actual measurement results and the influencing factors of temperature rise.
A Displacement-Based Optimal Design Method of RC Frames Subjected to Minor Earthquakes
Authors: Chen Gui Tao , Wei De Min
Published: November 2012

A displacement-based optimization design method of RC structure was proposed by combining direct displacement-based design method with nonlinear programming technique. To avert the influence of target displacement, the stationary constraint displacement was presented, and the target displacement can be updated during the optimal design process. Principle of virtual work and Gaussian integral method was employed to simplify the explicit relationship between horizontal displacement and the section dimension. Comparison analysis of the local optimal results corresponding to different displacement shapes was conducted to achieve global optimal design. The numerical tests presented demonstrate the computational advantages of the discussed methods and suggesting that the proposed method is a reliably and efficiently tool for displacement-based optimal design.
Study on Mechanical Properties of Iron Wire Cement Mortar
Authors: Liu Zhi Hao , Liu Chuan Xiao , Huang Dong Chen , Wang Long
Published: November 2012

Through the uniaxial compression test, the mechanical properties of different placements of iron wire cement mortar, e.g. compressive strength and elastic modulus, were studied, and the mass ratios of cement, sands and water influencing the mechanical properties were put forward, which provided the experimental results for reference for the wide use of the iron wire cement mortar material. From the study it is gained that: (1) The best placement of the iron wires in cement mortar is horizontal. (2) The best mass ratio of the cement, sands and water is 1:4.70:0.81.
Theoretical Analysis of Natural Vibration Frequency for Unbonded Prestressed Concrete Beams
Authors: Li Feng Ge , Li Rong
Published: November 2012

This papers deals with the study of the influence of prestress force on the natural frequencies for unbonded prestressed concrete beams. A total of 5 unbounded prestressed concrete simply support beams were constructed and tested. The test results show that the prestress force has little effect on the nature frequencies of unbonded prestressed concrete beams. A model of variable stiffness is proposed to calculate the natural frequencies of prestressed concrete beams with unbonded tendons, which assumed that the flexural rigidity of the beam is changing when beams vibrating. The calculate results show that the calculation results by the proposed model agree well with experimental ones.
The Study on the Strengthening of Wind-Resistant for Transmission Tower in Coastal Areas
Authors: Xiao Qi , Li Zhuo , Xu Xiao Hai
Published: November 2012

As the capacity of strong wind-resistant of the transmission tower for long running time is relative weak, the accident of tower collapses frequently occurred is a serious threat to the safe operation of the transmission line. Firstly the check and calculation of wind-resistant of the transmission tower were did, then the paper built the finite element model of the transmission tower to study the weak location with ANSYS software based on the practical engineering accident of PingzhaⅠdual loop transmission lines. Gusset plate model was created, through numerical analysis, the strengthening method was proposed for the capacity of wind-resistant of the transmission tower. This paper is of referring value for the bearing capacity increment of the same type transmission tower in coastal areas of multiple strong winds.
The Impact of Aggregates Distribution on Concrete Failure
Authors: Du Min , Gao Ping , Chen Fa Jia
Published: November 2012

As the key component, the aggregates have a significant impact on the concrete’s mechanical properties and fracture modes. To study the impact of aggregates distribution on concrete failure, the extended finite element method (XFEM) is adopted to simulate the mesostructure failure process by virtue of random aggregate model under uniaxial tension. The result shows that aggregates distribution has little effect on the concrete mechanical properties, but aggregates distribution effect fracture modes.
Sliding Analysis on Steel Encased Concrete Composite Beams
Authors: Jiang Ji Tong , Xue Yan Yang , Dong Kun , Du De Run , Yang Song
Published: November 2012

The encased concrete composite beams were modeled and calculated using nonlinear finite element method, considering relative slipping of concrete and steel. on that basis, the load-deformation curve and the relative slip distribution of the models between concrete and steel along the longitudinal beam bottom were analyzed. Then the results were compared with existed test data; in addition, numerical simulations in 4 groups with cotters in different separation distances were performed, the deformation feature and relative slip distribution rule of concrete and steel in different shear connection degree were discussed.
Ecological Classification of the University Development
Authors: Zhong Li Qiang , Wang Yu Jie
Published: November 2012

Analyzing the construction practice in the ecological development of universities, it is the fact that universities have entered the period of ecological transition. According to the biodiversity in nature, the article has categorized the ecological transition of university and raised the different mode of ecological features.
Study on Low-Carbon Transportation Plan in China
Authors: Xiao Hong
Published: November 2012

The urban motorization has enhanced along with economy development in China, but the environment question and the energy question which brings by the transportation is more serious on urban , I analyzed urban problems along with high density construction by large population, and put forward that the key to low-carbon urban planning under the motorized issues is to deal with relationships between centralization and decentralization .
Freeway Speed Limit Considering the Traffic Efficiency
Authors: Yi Zhang , Zhao Yang Dong
Published: November 2012

The speed is an important indicator of the traffic flow. The speed also reflects the road service level, and it is especially important on the freeway. The speed that is reasonable or not will influence the traffic operation situation, traffic safety issues and so on. This paper considered factors of three aspects to set the speed limit of freeway and analyzed the speed limit with the case Xi-Bao Freeway, Shanxi Province. Because of considering multiple factors of multiple aspects, the speed limit of freeway will be much rational and much scientific.