bluuebunny/crossref_metadata_2025 huggingface dataset:
Architectural Aesthetics and Mechanical Behavior of Hagia Sophia
Authors: Zhang Xiao , He Jian Hao , Liang Xing Hua , Huang Shi Qing
Published: September 2014

Ancient architecture in Europe is one of the most historic and characteristic system in the world. It follows the order of combining structure and aesthetics. Researching in the pendentive used in Hagia Sophia, this paper explores that European ancient architecture is harmonious and unified in both structure and aesthetics.
Research on Risk Level of Debris Flow in an Area
Authors: Yang Qing Nian , Wu Shuai Tao , Li Zhi
Published: September 2014

The research targets at the transition zone from the southeastern margin of the Tibetan Plateau to the Sichuan Basin; it is shown according to field survey: from 2008 to 2010, debris flow occurred twice, resulting in missing of two people, destruction on a lot of farmland and other serious disasters. Such the debris flows were because that the original vegetation was severely damaged after “5.12” earthquake, a lot of loose blocks were scattered in slopes and valleys, and also stimulated by abundant rainfall during rainy season, local steep terrain, as well as narrow valleys. The paper makes qualitative and quantitative evaluation on risk of debris flow within the region by single-valley debris flow risk evaluation method as proposed by Liu Xilin and Tang Chuan et al. it is shown from the results that the risk level H is 0.55, within scope of moderate risk. In case of any adverse conditions, debris flows may occur again.
Smoke Control in Subway Tunnel Fires
Authors: Zha Xiao Xiong , Zeng Sheng , Chen Yi Yan , Jiang Rui Juan
Published: September 2014

This paper concerns the smoke control modes and the critical ventilation velocity when the subway tunnel on fires. The standard for the smoke control mode is making sure the smoke exhausting in the shortest way. The critical ventilation velocity means it is just sufficient to prevent the smoke spreading upstream. The critical velocity in different heat release rates obtained though theoretical analysis and computer simulation. In the end, a simple formula to calculate the critical velocity can be fitting out.
Study on the Evaluation Index System of Urban Disaster Mitigation Community
Authors: Song Bo , Zhu Hong Bo , Li Liang
Published: September 2014

Based on the analysis of different urban communities, and the study of a large number of domestic and foreign literatures, the basic principle of urban community evaluation index selection system with the characteristic of completeness, measurability and comparability is proposed in this paper. This paper constructs the evaluation index system of disaster prevention of the community from basic characteristics, inherent risk to disaster mitigation resources, including three first grade assessment indexes, 12 second grade assessment indexes and 24 third grade assessment indexes.
The Classification and Development of a Selection Support Program of a Subway Station as a Temporary Shelter
Authors: Kim Eun Young , Hwang Eun Kyoung
Published: September 2014

The requirement for the utilization of a subway station as a temporary shelter is promptness. In this regard, it is necessary to make different preparations prior to the occurrence of a disaster. This study aimed to calculate the acceptable occupancy rate per space area and the acceptable sanitary provisions, to classify subway stations, and to develop a subway station selection program based on the identified standards. The subway station selection process is classified into four steps: regional understanding, acceptable-ability calculation, subway station identification, and temporary shelter building. The program thus involves these four steps. It is necessary to continuously manage and control the drawings and programs of each subway station for the efficient use of the selected system.
Simulation Study on a New Type Buckling Restrained Brace
Authors: Ma Hua , Zhang Fang Liang , Li Zhen Bao , Mfinda Diane Amba , Li Han Jie
Published: September 2014

A new type buckling restrained brace ensuring to work under different levels of earthquakes is analyzed in this paper. The brace is simplified by LINK elements of SAP2000. The skeleton curve of the mode is clarified. Three specimens with different slot widths are designed to evaluate the simplified model used in the software SAP2000. The evaluation work is accomplished through the software ABAQUS. The force mechanism, the hysteretic model and proposed reasonable scopes of slot widths are grasped. The numerical simulation work proves that the new type buckling restrained brace performs excellently.
On Strict Protection and the Sustainable Use of Modern Historical Building in Mount Lu
Authors: Zou Lei Rong , Li Xiao Qiong
Published: September 2014

In recent years, with the vigorous development of tourism industry in Mount Lu, due to the lack of protection on Mount Lu historical architecture, and the lack of planning and control, chaos, disorderly change and arbitrary disassembly often take place, the number of modern buildings have dropped sharply, which is mainly due to severe damage. In this paper, the author proposes the strategies of strict protection and sustainable use from the perspectives of cognitive enhancement and deepening experience, based on the problems existing in the use and protection of modern buildings in Mount Lu. The key point of Mount Lu tourism development is protection, effective protection must be combined with reasonable utilization to realize the goals of "maintaining current conditions and regeneration".
Research on Heritage Values of Industrial Buildings of Xi’an in the First Five-Year Plan Period (1953-1957)
Authors: Xiao Yi , Ren Yun Ying , Liu Shu Hu
Published: September 2014

With the development of urban economy and the transition of the traditional industrial structure, Xi’an has witnessed a large-scale demolition and abandonment of industrial buildings in urban renewal during last 30 years. The paper presented the historical background of industrial buildings of Xi’an in the First Five-year Plan Period, and analyzed the value of industrial buildings from the perspectives of historical, social, architectural and technological aspects accordingly. Therefore, it confirms the heritage values of the industrial buildings of Xi’an on the whole and presents they should be protected.
Shallow Parsing Gaojiabu into Traditional Houses of Folk Culture
Authors: Xiang Hong Yan
Published: September 2014

This article Gaojiabu traditional dwellings were discussed, analyzed residential building construction material selection, construction activities and decorative themes inherent in the traditional folk customs, traditional cultural values​​, elaborated the building and its associated traditional culture as a whole to the importance of conservation.
Overview of Modern Building Development in Guangzhou
Authors: Han Yan Juan , Li Bai Hao
Published: September 2014

Taking the development of buildings techniques as the main line, the evolution of urban architecture in Guangzhou was briefly discussed. Western building technology is the main thrust for the evolution of Chinese modern architecture, leading Chinese architecture transformed from traditional styles to the modern. Being a process of importing, imitation, digestion and absorption of the western building technology, the evolution of Chinese modern architecture could be divided into three stages: budding stage, implantation stage and localization stage. At the budding stage, the change is concentrated in the evolution of masonry techniques and building materials, such as brick and stone. The representation of the implantation stage is the advanced materials and techniques, such as cement, plate glass, steel and reinforced concrete structures were successively imported. According to application times for advanced technology, it is probably on the same level for China and Western building technology in the implantation stage. During the localization stage, with the growth of Chinese designers and craftsmen, traditional building styles were explored and practiced in new architecture forms to adapt the local environment combining with the western building technology, and all the tests have promoted the localization of modern building technology in Guangzhou.
Risk Management in Innovation Projects
Authors: Titarenko Boris , Titov Sergey , Titarenko Roman
Published: September 2014

The report deals with projects risk management approaches and methods. The methods are based upon the main provisions of the following standards: International Competence Baseline, published by International Project Management Association – IPMA and National Competence Baseline published by Russian Project Management Association – SOVNET. It is known two types of risk management methods: qualitative and quantitative. Qualitative methods deal with procedures that reduce the risk of risk situations and the quantitative methods allow to produce quantitative estimates of the proposed activities using SOVNET system methodology.
Study on the Cost Control of Construction Project
Authors: Zhang Ying , Zhuang Si Yu
Published: September 2014

Cost control of engineering construction project is a complex system engineering, which needs to implement a scientific and comprehensive dynamic management. This paper expounds the connotation and significance of the cost control of engineering construction project, the systematically discourses the project cost management subject program and work content, and considering the engineering practice, emphatically analyzes cost management and cost control measures in the construction phase, to help construction enterprise do the job of engineering construction project cost control, and to improve the service efficiency of funds of infrastructure construction.
Grey Synthetic Relational Analysis Method-Based Effectiveness Evaluation of EWCC System with Incomplete Information
Authors: Qi Zong Feng , Wang Guo Sheng
Published: September 2014

The grey synthetic relational analysis (GSRA) method-based effectiveness evaluation of the electronic warfare command and control (EWCC) system with incomplete information is investigated. The evaluation hierarchy structure of the EWCC system is put forward and classified into the target hierarchy, the rule hierarchy and the scheme hierarchy. Then, based on the analytic hierarchy process (AHP) method and the grey relational analysis (GRA) method, the GSRA method is given to evaluate the effectiveness evaluation of the EWCC system with incomplete information. Finally, an effectiveness evaluation example of three EWCC systems with incomplete information shows the effectiveness of the GSRA method.
Research on the Sustainable Development of Engineering Contracting Enterprises under the Low-Carbon’s Background in China
Authors: Wang Yan Yan , Ren Hong
Published: September 2014

The engineering contracting enterprises have the following development obstacles including the lower profit level, malignant competition intensified, the lower financing level and the sole industrial structure. Along with the stern challenge of the climatic change in the whole world, the enterprise must apply the low-carbon thinking to reconstruct operation mode. They should use the diversification strategy to widen the enterprise’s competition channel, strengthen the research and development of low-carbon technology to promote the competition level and apply the measures of the high-quality personnel training and the technical science and technology to impetus the management mechanism innovation. These measures provide the highly effective realization path for the enterprise’s sustainable development.
Study on Calculation of Interface between Fresh-Old Concrete in Assembled Monolithic Water-Distributing Beam
Authors: Tian Hua , Zhang Zi Xian
Published: September 2014

The fresh-old concrete bonding interface is the key to designing assembled monolithic water-distributing beam of mechanical draft cooling tower. Force mechanism analysis indicated the loading-failure process was closely related to the development of cracks, which, combined with moist circumstance, aggravated corrosion. So the interface must be controlled in uncracked. In the critical condition, aggregate interlock of concrete and dowel action of reinforcement composed the shear strength of interface. Affected by the combined impact of shear force and moment, main rebar is under a state of complex stress, the principal stress of which can be calculated by the forth strength theory. Toutilize the rebar completely, the length of rebar in cast-in-site part should abide by the anchorage length.
Study on Mechianial Properties about PBL Shear Connector
Authors: Liu Hou Ping , Li Ling Fang , Wu Jian , Cheng Chen , Wan Shui
Published: September 2014

Based on the push-out test of the improved PBL shear connector, a finite element modal was established. In the FEA software of ANSYS, element type of Solid65 was adopted to simulate concrete; element type of Solid45 was adopted to simulate perforated rebar and steel plate, and element type of Conta173 and element type of Targe170 were adopted to simulate the interaction between perforated rebar and concrete, corrugated perforated plates and concrete. From the calculation of finite element modal, carrying capacity of the shear connector and the relative slip between steel plate and concrete were got. By comparing, the result of experiment is well with the result of calculation. Furthermore, the finite element modal is used to simulate mechianial properties of double row holes PBL shear connector. From the result of calculation, it can be concluded that the carrying capacity of double row holes shear connector is higher than the single row hole shear connector.
Study on the Deflection Behavior of HRBF RC Beams under Serviceability Limit States
Authors: Ge Wen Jie , Wang Bi Yuan , Cao Da Fu
Published: September 2014

In order to investigate the deflection behavior of concrete beam reinforced with high strength hot rolled bars of fine grains (HRBF) under deflection control condition, four concrete beams reinforced with HRBF400 and HRBF500 rectangle cross-section concrete beam static bending test were made. The results show that Mid-span deflection of concrete beams reinforced with HRBF400 under normal conditions still meets the requirement of current code while concrete beams reinforced with HRBF500 could not meets the requirement. Mid-span deflection was calculated by current code and compared with experimental value, the results show that calculate value was a little bigger than experimental value and tend to be safe, deflection could still calculated by the current code. Bearing capacity calculates formula under the conditions of deflection control was proposed, conception of component’s bearing capacity utilization coefficient (BCUC) was put forward. Effects of reinforcement strength, concrete grade, reinforcement ratio and depth-span ratio on BCUC were analyzed.
Characteristics of Structure Small Damage Detection under Strong Noise Background of Wavelet of Potter Syndrome
Authors: Zhao Lei , Zhang Yu , Zhang Guo Qiang
Published: September 2014

This paper presents a study on the effect of input noise on the detect index of structural damage. The main procedures include that, for some structures with small damage, the different dynamics response are obtained under the given input function and various input noise level, and then, the structural damage index is constructed using the energy spectrum of the sub-signal decomposed by wavelet analysis. Results show that the relationship between the different input noise level and the damage index is nonlinear, and some optimal signal/noise ratio can be found in order to obtain the most sensitive damage index to small structural damage.
The Comparison of the Cantilever Truss Node Displacement Calculation Methods
Authors: Wu Sha Sha , Gu Dong Sheng , Gu Xiao Jie , Zhou Tai Quan
Published: September 2014

In this paper, some popular software, such as structural mechanics solver, ANSYS and SAP2000 are used to calculate the deformation of truss structure under statics loading. This deformation can also be handy calculated by the principle of virtual work of structural mechanics. By comparing the calculated results with the experimental data, we can test the accuracy of these methods, especially when the joints in a truss structure are modeled as hinge joints or rigid joints. The calculated results show difference of the different modeling is very slight. The accuracy of hand computation is also satisfied compared with the results of software.
Analysis of the Research Status and Trends of Anti-Slide Pile with Prestressed Anchor Cable
Authors: Zhang Chao
Published: September 2014

The research status of anti-slide pile with prestressed anchor cable is summarized from the aspects of test, calculation and optimization design. The main problems in the design and application are elaborated, especially the interaction and deformation coordination among prestressed anchor cable, anti-slide pile and soil, as well as the existing shortcomings of soil arch effect, anti-slide pile internal force calculation, landslide thrust calculation and finite element numerical simulation. Anti-slide pile with prestressed anchor cable is analyzed on the research trends of development. Interaction mechanism, time effect, three-dimensional numerical simulation and further optimization design will be the key research direction.
Analysis about the Classification of Landslide Monitoring Method
Authors: Xu Xin , Shang Min , Deng Yong Huang
Published: September 2014

China has Suffered from the Landslide a Lot, which Mainly are Large and Giant Slope Slide. in the South-West of China and Three Gorges Reservoir Region, Landslide has Caused Great Lost to the People's Production and Living.Thus,building the Efficient Landslide Monitoring System is Not only Beneficial to Avoid the Occurrences of Landslide by Engineering Method, but also could Reduce the Lost Caused by Landslide. at Present, China Landslide Monitoring has Reached the International Advanced Level. the Monitoring has Large Monitoring Range with Various Methods. in this Paper, the Landslide Monitoring Method has been Classified by the Aspects of Monitoring Means and Monitoring Objects. According to the Difference of Monitoring Means, the Various Landslide Monitoring Methods could be Divided into Five Different Kinds, such as Macroscopic Geological Observation Method, Simple Monitoring Method, Setting-Station Monitoring Method, Instrument Monitoring Method and Auto-Telemeter Method.Meanwhile,basing on the Difference of the Monitoring Objects, the Landslide Monitoring could be Divided into 5 Categories, which are Deformation Monitoring,earthquake Sound Monitoring, Strain Monitoring,hydrographic Monitoring,environmental Factors Monitoring and Etc.It Provides Certain Reference Significance for the Selection of Landslide Monitoring Means According to the Differences of Monitoring Objects.
Analysis of Distribution Characteristics and Reliability for Bearing Capacity of Piles
Authors: Zhang Shu Jun , Xu Zhi Jun , Wang Kai , Zhang Bo
Published: September 2014

This paper aims to study the distribution characteristics of the ratio of measured value and calculated value for ultimate bearing capacity, shaft resistance and tip resistance, and discuss the impact of shaft resistance and tip resistance on ultimate bearing capacity. A new performance function is proposed in terms of the three types of bearing capacity mentioned ahead. Take bored piles and driven piles for example, and the results from analysis indicate that the ratio of the measured value to calculated value of bored piles ranges from 0.75 to 1.45, and mostly is greater than 1.0; The ratio of the measured to predicted bearing capacity of driven piles lies between 0.8 and 1.5, and is larger than the corresponding ratio of bored piles. In addition, the reliability of tip resistance is lager than that of shaft resistance for bored pile, while the reliability of tip resistance is less than that of shaft resistance for driven piles. Meanwhile, the method presented in this paper can offer references to designers for revising and improving the technical code for pile foundations.
Analysis of Effective Length of Super-Long Pile
Authors: Xie Liang , Tang Bin
Published: September 2014

In recent years, the application of super-long piles gradually increased, therefore the research about effective pile length is imminent. This paper summarized the meaning of effective pile length from two different points, bearing capacity and settlement. Analyzed its application and discussed the advantages and disadvantages of the various effective pile length calculation methods, it has the important guiding significance and application value to the reasonable pile length design of the present actual project.
Artificial Rainfall Failure Experiments for a Red Clay Slope
Authors: Chen Kai Sheng
Published: September 2014

The influence of rainfall on slope stability problem that highway, railway,water conservancy and energy engineering production must consider and study, the rainfall is one of the major factors causing the soil slope failure。Establishing model test of red clay slope, rainfalling the model, the paper analyzing the moist frontal edge, power water pressure, slope displacement under the rainfall. The result has some reference value for fundamental mechanism of rainfall infiltration induced landslides in a red clay slope.
Axial Unloading Test of Soil Based on the GDS Triaxial Apparatus
Authors: Zhang Shu Chao , He Shao Hui , Wang Pei , Li Lin
Published: September 2014

Normal triaxial apparatus is suited to the loading stress path test, some stress path triaxial apparatus can be used to unload radial load smaller than the axial load, but it is difficult to unload axial load smaller than the radial load or even unload the axial load to zero. Using the iso-diameter headgear, different axial-radial unload ratio tests were done on the GDS triaxial apparatus, and the axial load was unloaded smaller than the radial load. During the test, it was found there are some deficiencies in the GDSLAB system. The results conformed to the characteristics of unloading test, which well verified the correctness of the test method and test results.
Boundary Element Method for Horizontally Polarized Shear Wave Scattering by an Elliptical Cavity in Orthotropic Graded Saturated Porous Media
Authors: Liu Jun Qiao , Duan Hui Qin , Li Xing
Published: September 2014

The shear wave scattering due to an elliptical cavity in an infinitely long strip of orthotropic graded saturated porous (OGSP) media is studied with the boundary element method (BEM). The shear modulus and the mass density of the OGSP are assumed to have exponential forms. Using Biot's theory, the governing equations are developed for OGSP. The fundamental function is obtained by separating variables in terms of the Dirac delta function. A system of linear equations describing the displacement on the ellipse is obtained by applying the linear BEM. The numerical results for the normalized boundary surface displacements in the scattering field are presented with different OGSP coefficients. The effects of many parameters are evaluated with numerical examples. These results are expected to have great technical interest for determining boundary stability when elastic waves interact with OGSP cavities.
Creep Property Experimental Research of Offshore Unconsolidated Sand Reservoir
Authors: Liang Ji Wen , Lu Chuan Shi , Zhang Chong , Xu Yi Long , Zhang Chao , Chen Jian Guo
Published: September 2014

Unconsolidated sandstone is a kind of formation with low strength and large deformation property. Deeper unconsolidated sand formations have larger geostress and perform the plastic and rheological characteristics. After the borehole has been drilled into, this kind of sandstone will creep, which will cause some problems such as pipe stuck and casing deformation failure etc. Therefore, creep parameters of unconsolidated sandstone are critical for designing drilling fluid density and choosing casing material. Through indoor experiments, creep data of unconsolidated sandstone from Zhujiang group of X oil field in the west of South China Sea was get. The experiments results indicate that creep law of this sandstone conforms to Nishihara’s model, and the creep parameters were calculated based on experiments data. According to Nishihara’s model, using numerical simulation method, this paper analyzes the relationship of sandstone creep shrinkage rate with time of Zhujiang group reservoir sandstone and determines the drilling fluid density that ensures the safety of horizontal wells drilling, which has guiding significance for well design and drilling.
Example Analysis on Safety Monitoring of Excavation Support Engineering
Authors: An Yan Yong , Shen Xiao Ming , Ma Xi Lei
Published: September 2014

During the construction of excavation, adopting top-down method and taking steel sheet piles as maintenance structure, some projects involving surface subsidence, surface displacement, deep horizontal displacement, underground water level and steel bracing internal force are monitored. Based on monitoring data, prompt feedback and early warning can prevent excessive displacement, deformation and engineering accident. Every monitoring indicator under control effectively achieves safety assurance of excavation engineering and surrounding building, realizes informatization construction of excavation engineering and guides similar engineering forcefully.
Discussion on the Effective Flange Width of the Floor
Authors: Lv Meng Zhou , Wang Yan Wei , Sun Xiao Yu
Published: September 2014

To consider the contribution of the floor to the flexural capacity of frame beams, slabs are usually equivalent to floor "effective flange width" . However, there are no academia acknowledged conclusions about the value of effective flange width was drawn. This article introduced the theories about the calculation of "effective flange width" and studied the influence of node type to the value by comparing various MIDAS simulation models. Finally, we concluded suggested formulas after combining the analysis and experimental results.
Gob Area Grouting Reinforcement
Authors: Bai Hui Ren , Li Jing Jing , Wang Dan
Published: September 2014

This paper mainly introduced the grouting reinforced governance issues of old goaf of which exist building on the surface. Combined with the engineering example, the use of GTS software to identify mined areas and the the drilling histogram to establish three-dimensional geological model of gob region. Put forward to carry out positioning quantitative grouting technology on the goaf according to three-dimensional geological model, and strengthen the gob by using grouting method.
Influence of Pile Cap Thickness on the Bearing Characteristics of Group Piles Foundation
Authors: He Chun Lin , Gong Cheng Zhong
Published: September 2014

Based on test method of numerical simulation, the bearing characteristics of large-diameter rock-socket pile with different super-thick pile caps have been analyzed, including the finite element model, Numeric Simulation of different heights of pile cap, Pile-soil load sharing, and stress flow analysis of thick pile caps. The results indicated that pile cap thickness has little influence on pile bearing capacity for the thick pile cap, when thickness of pile cap increases to a certain thickness, it would not affect the settlement characteristics under the pile caps. With the increase of the thickness of cap, the pile side friction load sharing value of pile side friction decreases, while the load sharing value of pile tip load increase, and soil force under the pile cap does not change with the different thickness of pile cap. However,it is advantageous to increase cap thickness to reduce tensile stress.
Dynamic Analysis of Suspended River Crossing Pipeline
Authors: Ren Zhi Ping , Liu Chang Hua , Bie Feng Feng
Published: September 2014

When the long-distance oil pipeline under rivers (referred to as river-crossing pipelines) are damaged by the third-party, they are prone to nudity or left vacant, and the oil pipelines under the action of water flow will cause pipeline failure; and the distance of suspended pipeline is longer than the allowed length will cause the pipeline resonance. In order to avoid pipelines fatigue or broken, suspended pipelines are considered as part of the arc shape, and non-suspended pipelines are considered as the linear shape of the mechanical model with the two ends of the fixed pier synchronous. The study will consider the impact of water flow, buoyancy, the gravity of pipelines and its annexes, bending deformation and bending moment, do the tense calculation for suspended pipelines with external load and the vibration analysis for suspended pipelines under different water flow speeds. The results showed that: the design of river-crossing suspended pipelines not only needs to consider the impact of water flow, buoyancy, the gravity of pipelines and its annexes, bending deformation and bending moment, but also to consider the floating vortex-induced vibration of the suspended pipeline, which should cause pipeline designers, constructors and maintainers’ attention.
Numerical Simulation and Analysis of the Height of Overlying Strata Fracture Belt Based on UDEC
Authors: Ma Shao Jie , Cao Ji Sheng
Published: September 2014

Measuring the height of overlying strata fracture belt with the “Double-plugging device” after mining the 3 upper coal, obtained the height, inverted the mechanical parameters of overlying strata according to the height, then conducted the numerical simulation with UDEC, and getting the height of overlying strata fracture belt when mining 3 down coal, with the data of this study we could expect the height of overlaying strata crack belt under the similar conditions, We can improve the upper limit of coal mining with the data of this research, and ensure safety in coal mining under the water.
Research on Technology of Abandoned Quarry Complex Rock Slope Stability Calculation
Authors: Liu Yuan Liang , Xie Xiao Feng
Published: September 2014

For the abandoned quarry complex rock slope project, the slope stability calculation is always the key technical problem, but due to the complex geological conditions and other factors, it makes the calculation of 3D modeling and the stability of the slope geological body and structure of the division, rock unit has always been the difficult problems in the field. This paper proposes a new method based on the rock mass structure combined with the degree of rock mass element, and then FLAC 3D, Midas GTS three-dimensional numerical calculation software are used, structure and surface topography in the slope, the slope surface fault, soft interlayer, complex geological 3D modeling, overcomes the problem of modeling of complex geological body, and the factors of rainfall, earthquake effect of the slope are consider for stability calculation, the calculation result is consistent with the reality, it has certain directive significance to the abandoned quarry re-greening slope stability analysis.
Simulation of Unconfined Compression Tests of Geogrid-Reinforced Granular Soil
Authors: Hu You Chang , Cai Hua Nan , Liu Jie , Mao Ai Min
Published: September 2014

In order to analysis of the mechanical properties of geogrid-reinforced granular soil, a simulation model of unconfined compression tests is proposed based on the laboratory tests conducted before by the author. This numerical method, after modified by the laboratory test data, is adopted to carry out a simulation of unconfined compression tests using large specimens of geogrid-reinforced granular soil. Each large specimen, with the diameter of 175cm and the height of 300cm, varies in reinforcement spacing of 30 cm, 37.5cm, 50 cm or 75 cm. For comparison, the same simulation test is also demonstrated for the granular soil without geogrid. A series of simulated compression stress-strain relationship curves are presented, on which a detail analysis is carried out. The following conclusions are obtained: (1) The geogrid-reinforced granular soil is a strain-hardening mass if the reinforcement spacing is less than about 50 cm. (2) While the reinforcement spacing is smaller enough, there is no sliding at the geogrid-soil interface and, therefore, the geogrid-reinforced granular soil may be taken as a composite material.
Study on Stability against Sliding of Seawall Subject to Ice Load and Freezing and Thawing Cycles
Authors: Zhang Yu Ting , Qiao Xiao Li
Published: September 2014

The seawall shallow foundation is silty soil in northern coastal area. So the seawall is subject to ice load and freezing and thawing cycles as the temperature variation. It is unfavourable for the stability against sliding of seawall. The experiment of silt soil sample under freezing and thawing cycles has been done to analyze the law of mechanical properties. On this basis the numerical model of seawall with stability against sliding has been established. The calculation results show that the soil strength index decreased under ice load and freezing and thawing cycles. The stability against sliding of seawall would be reduced. Under ice load and freezing and thawing cycles the Mises yield stress reduced, horizontal and vertical displacement would be greater slightly. The stress of the plastic zone would be evenly distributed. The Plastic penetration area does not appear.
The Engineering Geological Defect Treatment of Yueliangwan Reservoir Dam Site
Authors: Lin Shan , Cheng Sheng Guo , Chen Xiao Hu
Published: September 2014

Yueliangwan Reservoir dam foundation there is fault fracture zone,silty sand layer geological and so on defects,dam foundation of inhomogeneous deformation and seepage problems is the key of the dam foundation treatment.Basis on conducting detailed geological surveying,to take remove foundation,consolidation grouting and replacement process measures to for engineering geological problems of the dam,effectively solve the inhomogeneous deformation and dam foundation seepage problems.
Estimation of Load Bearing Capacity of Eccentrically Compressed Reinforced Concrete Elements under Dynamic Loading in Fire Conditions
Authors: Tamrazyan Ashot , Avetisyan Levon
Published: September 2014

Research of influence of fire impacts on the dynamic strength of eccentrically compressed concrete elements requires a deeper consideration. The purpose of this article is the study of dynamic strength of eccentrically compressed concrete elements in fire conditions under rapidly increasing dynamic loading. It is done the analytical calculation of eccentrically compressed reinforced concrete columns under different thermo powers conditions, there are shown the results of calculations and experimental data. It is shown a graph of dynamic coefficient for concrete depending on the time of dynamic loading and temperature.
Time-History Analysis of Tibet Gravel Slope
Authors: Chen Fang Chao , Cao Zhi Xiang , Wa Da , Song Xin Wei
Published: September 2014

In order to obtain the Tibet gravel slope’s response under earthquake, using ABAQUS analysis this kind of slope and get the peak acceleration on the key elements along the slope height. Found that the result can truly gave the max acceleration during earthquake and the acceleration distribution of the slop.
The Landslide Examples Caused by Engineering Construction in Tropical Forests of Hainan
Authors: Liu Hui Jiang , Li Guang Fan , Li Yan Rong , Wang Xiao Liang
Published: September 2014

With the development of Hainan tropical rain forest tourism, the constructions of transport and water conservancy facilities are improving in these areas, which will probably cause landslide for changing the topography of the original slope conditions. In that context, a study is performed to find out the reasons for the landslide in tropical forests areas by employing some examples.
Study on Load-Bearing Mechanism of Stabilizing Pile-Groups by FEM and its Application
Authors: Qiu Huan Feng , Fu Shao Jun
Published: September 2014

The behaviour of pile-groups subjected to lateral soil pressure is a key consideration in establishing the design parameters of pile-groups. In this paper, one representative section of the Chongqing Jiangdong slope is taken as an example. The existence of an arching zone around pile groups for granular and fine-grained soils is first examined using the finite element computer code CORE-3D. Pile load-displacement curves and the arching effect are considered together to explain how the stresses are transferred from the soil to the piles. The key parameters controlling the soil arching effect are centre-to-centre pile spacing (S), thickness of stable soil mass (H), depth (L) of pile embedment, pile diameter (D) and these were studied extensively. An empirical equation summarising the results is presented and the results have been adopted by the designer in practice.
Experimental Research on Thermal Behavior of Light Gauge Steel-Framed Composite Walls with Slotted Studs
Authors: Wu Sheng
Published: September 2014

Two thermal experiments of light gauge steel-framed composite walls with slotted studs and with external thermal insulation layer were carried out in the lab of combined energy consumption test board for components of building envelope in school of municipal and environmental engineering at Harbin Institute of Technology (HIT). The lab is one of the key laboratories of Ministry of Housing and Urban-Rural Development of the P.R.China. The method of thermocouple temperature measurement has been used. The heat transmission coefficient and the measuring point temperature of composite wall have been deeply investigated, which is finely compared with the FEA model results at the same time. Two conclusions can be drawn from the test: web slotted studs can reduce heat loss of the light gauge steel-framed composite walls obviously, thus it can weaken the thermal bridge effect of the location in stud part, so it can improve the thermal insulation properties of the composite walls significantly; the composite walls’ heat transmission coefficients of the two test schemes go to: 0.315W/(m2·K)and 0.250W/(m2·K), which can meet the residential building envelope heat transmission coefficient limit value in the cold areas of China well.
Analysis of Stress and Deformation of Rockfill and Concrete Face for High Concrete Face Rockfill Dam
Authors: Ji Shun Wen , Zheng Min Sheng , Weng Zhan
Published: September 2014

The deformation and contact behavior between concrete face and rockfill are important to the safety of concrete face rockfill dams. Based on the monitoring data of Shanxi concrete face rockfill dam, the stress of concrete face, deformation of rockfill and facing joints were studied. It is shown that the rockfill deforms under the water pressure and weight, and the concrete face is compressed in central and otherwise around abutment during the reservoir filling. As the upstream concrete face deforms as the result of the rockfill deformation, the peripheral joints appear tensile, shear and settlement deformation. In addition, the main deformation of peripheral joints is settlement, which has a significant relationship with water level, especially for the upper ones.
Application of AutoBank in the Dike Reinforcement Calculation of Lower Qinhe River
Authors: Cui Wen Juan , Li Li Qin , Zhang Wei
Published: September 2014

Calculation of seepage stability is important method in selection and justification of reinforcing dike seepage control measures. In the reinforcement design of the Qinhe river dike downstream, the finite element method of AutoBank is used to calculate the seepage stability of the dike reinforced before and after, and an economic and reasonable reinforcement scheme is selected then.
Initiation and Propagation of Cracks in the Middle Diversion Pier of Xiaowan Arch Dam
Authors: Qiu Huan Feng , Fu Shao Jun
Published: September 2014

The factors resulted in the cracking of Xiao-wan arch dam are extremely complicated. A numerical analysis based on elastic-viscoplastic mechanics theory has been developed to study the cracks in the middle diversion pier of Xiaowan Arch Dam. This analysis aims to investigate the cause of cracks and the reliability and accuracy of the analysis model have been examined. By using this analysis and the obtained results, the following conclusions are drawn: 1) cracks were not induced by a single cause, but a multitude of various effect such as stresses induced by thermal movements, the bond between the anchor cables and the surrounding concrete and the pressure due to the impounded water, amongst which the thermal stress is the most significant reason; and 2) with the presence of water in cracks, if the drainage hole continues to run overflowing water, the stress intensity factor of a crack tip will exceed the fracture toughness of the concrete. With the hydraulic fracture effect, the crack will grow continuously. The findings derived from this study will provide useful information for future projects of the similar nature.
Analysis of Seepage Field of Highway Tunnel Excavation by Finite Difference Method
Authors: Zhang Yong Tao
Published: September 2014

As the excavation of tunnels, there are new channels of the groundwater drainage. The original supply of the circulatory system has been destroyed. The effects of groundwater to rock mass of surrounding rock are aggravated. In this paper, combined with a new highway tunnel project, the model is built according to the design parameters and the site engineering geological conditions of the tunnel. The fluid-structure interaction module of the finite difference software FLAC3D is used for the research on tunnel excavation. The distribution of seepage field, the stability of surrounding rock and rock deformation under saturated conditions during the tunnel excavation have been analyzed. The simulation results have certain guiding meaning on fracture development, the stability design of tunnels in water-rich stratum and the design and construction of anti-drainage.
Optimization Design of Single Track Railway Tunnel Lining Structure
Authors: Niu Ze Lin
Published: September 2014

Based on the traditional safety coefficient method,Continuum Model and single track railway tunnel lining structure, the paper does numerical simulation calculates and compares effects of actions on tunnel lining structure, analyses and get the effect of actions in different section of tunnel lining.According to the tunnel lining element’s safety coefficient and standard requirements, reasonable lining structure thickness is gave by comparison and optimization of lining structure thickness,and this provides the theory support for the structure design of track railway tunnel .
Deflection Control Method Study of Long-Span PC Continuous Rigid-Frame Highway Bridge Compared with Railway Bridge
Authors: Wu Xun , Yue Jian Jun , Huang Xian Zheng
Published: September 2014

Down-deflection of long-span prestressed concrete (PC) continuous rigid-frame bridges in highway is more serious than in railway. Deflection comparison of highway bridges and railway bridges can provide a reference for the deflection control of highway bridges. Differences of highway and railway design codes about deflection were firstly analyzed. Then, the whole construction processes of a highway bridge and a similar span railway bridge were simulated by Midas/Civil. Both the stress state and long-term deformation were compared. The results show that stress states of the railway bridge will reduce the down-deflection. Finally, for highway bridges, we propose the compressive stress at upper edge of pier-top section should be slightly larger than that at lower edge during the layout of prestressed tendons.
Qualitative Discussion of Influences of some Factors on the Occurrence of Wind-Driven Coastal Upwelling Associated with “Aoshio” on the Northeast Shore of Tokyo Bay Using the Developed Analytical Model
Authors: Zhu Zhong Fan
Published: September 2014

An analytical model based on some solutions in the context of a two-layered fluid was developed to estimate the occurrence of northeasterly wind-driven coastal upwelling associated with “Aoshio” on the northeast shore of Tokyo Bay, and its validity was verified by comparing with observation data [1]. In this study, influences of all of the factors incorporated into this analytical model (including densities and thicknesses of the upper and lower layers, the parameter expressing the influences of interfacial friction and bottom friction) on the model are analyzed. The analytical model is found to express the competition between the wind-shear effect and the stratification effect: when the former dominates over the latter, Aoshio will occur on the northeast shore of the bay. The parameter that can be used to characterize the stratification effect can be simply expressed in terms of the product of density contrast and the square of thickness of the upper layer. Using different values of this parameter corresponding to different months in the model can simply estimate in which months it is easy for Aoshio phenomenon to happen on the northeast shore of the bay, and the result is roughly consistent with an observation phenomenon that Aoshio was frequently observed on the northeast shore of the bay in September and May and relatively less observed in June and July during 1978-2010.
The Optimal Wind Direction for the Occurrence of Wind-Driven Coastal Upwelling Associated with “Aoshio” on the Southeast Shore of Tokyo Bay
Authors: Zhu Zhong Fan
Published: September 2014

Whether the optimal wind direction for the occurrence of wind-driven coastal upwelling associated with "Aoshio" on the southeast shore of Tokyo Bay exists was not clear. In this study, Tokyo Bay was assumed to be a narrow, infinitely long channel with only the southeast shore and the northwest shore being its two boundaries, and the optimal wind direction for coastal upwelling associated with "Aoshio" on the southeast shore of this idealized channel was discussed. It is found that the optimal wind direction varies with wind duration. If wind duration is very short, the optimal wind direction is almost across the channel while, with the increasing wind duration, the optimal wind direction approaches gradually to be along-channel. This transition is attributed to the increasingly important role that played by the Coriolis force in the motion of the two-layered fluid with the increasing wind duration.
A Probe on Urban Agriculture-Oriented Ecological City
Authors: Zhou Tong , Zhao Tao
Published: September 2014

This article, based on introducing the connotation and function of urban agriculture, analyzed the relationship between the development of urban agriculture and the construction of ecological city, and gave proposals and ideas for the development of urban agriculture. The development of urban agriculture is conducive to eco-city construction and also an inevitable choice of eco-city construction.
A Study on Development Policy of Low-Carbon City
Authors: Wang Dong , Guo Hao
Published: September 2014

In recent years, with the global climate issue and the contradiction between energy environment and economic development becoming increasingly prominent, Shenzhen International Low-carbon City, as the flagship project of China-EU Strategic Cooperation on Sustainable Urbanization, aims at exploring new ways to realize low-carbon development models, while low-carbon development policy is one of the key factors. This paper firstly introduces the background of the Shenzhen International Low-carbon City Project, then summarizes advanced experience and gives experience reference in low-carbon development policy of the developed regions worldwide, and finally puts forward relevant countermeasures and suggestions.