bluuebunny/crossref_metadata_2025 huggingface dataset:
A Study of the Partially Prestressed Tendons RPC Concrete Pole Connection Design
Authors: Ju Yan Zhong , Yu Dong Xu , Dehong Wang
Published: June 2012

In order to study and solve the problem of connection on the part of the prestressed tendons RPC concrete pole engineering. Design connecting flange suitable for the existing part of the prestressed tendons RPC concrete pole developed by our group used the connection flange in Steel tower as the prototype.Through the ABAQUS software to establish the finite element model between the connection flange and part of the prestressed tendons RPC concrete pole, and carry out finite element analysis.Through the finite element analysis to get results whether the design of connecting flange can meet the strength requirements when the prestressed tendons RPC concrete pole is under ultimate load, so to get the practical design method of the 500kv part prestressed RPC concrete pole connecting flange.
The Alternation Story-Height Truss Lateral-Load-Resisting System and its Simplified Analytical Method
Authors: He Yong Jun , Zhou Xu Hong , Yang Cheng Chao
Published: June 2012

Based on the characteristics of 3D parking, a new type of 3D parking structure with alternation story-height truss lateral-load-resisting system is proposed in this paper. By adoption of the assumption of inflection point, a simplified analytical method for this system under horizontal load is studied and the formulas for internal forces of it are derived. The numerical example indicates that the error of the results calculated by the presented formulas does not exceed 5% in comparison with those by finite element method. Therefore, the method and its related formulas are feasible for preliminary design of the steel 3D parking structure since its accuracy and briefness.
Bond Capacity of FRP Plate Depending on the Retrofit Methods and Shear Key Locations
Authors: Seo Soo Yeon , Yoon Seung Joe
Published: June 2012

Retrofit using FRP materials for strengthening reinforced concrete member is widely applied, as this method is advantageous in terms of workability and performance guarantee. But in External Bonded Retrofit (EBR) methods, bond capacity, which is the most important part of FRP retrofit, frequently lowers. As an improved method, Near-Surface-Mounted Retrofit (NSMR) method was developed to secure absolute bond capacity in performance required from an epoxy adhesive between FRP Plates and concrete. This paper deals with the experimental result about the bond capacity of EBR and NSMR method and the effects of shear keys in NSMR. As a result, NSMR methods showed more increasing in bond strength than EBR methods. In addition, given that maximum strength increased as shear keys became more distant from a loading direction, the effects of these shear keys raised.
Test Research on Cast-In-Situ Concrete Pipe Piles under Lateral Load
Authors: Ma Zhi Tao , Wang Yong Ping , Liang Sai Jiang
Published: June 2012

Using the model test systems self-designed, the deformation characteristics such as displacement and bending moment of cast-in-situ concrete pipe piles under lateral load were studied, the nonlinear characteristics of pile top horizontal displacement and the maximum bending moment variation with load were also analyzed by fitting the measured data. Further, the main factors such as pile length, pile diameter that affect the deformation characteristics significantly were also analyzed. The results show that the relationship between horizontal displacement of pile top and load is nonlinear hyperbolic, but the relationship of maximum bending moment and load is power function. All results can provide a reference for related pile projects.
Performance Analysis of GFRP/Steel Composite Box Beams
Authors: Li Yun Yu , Wang Yan Lei , Ou Jin Ping
Published: June 2012

To overcome the inadequacy such as the low stiffness, the weak shear capacity, brittle failure and the big initial cost in all FRP box beam, and to make use of the benefits of steel such as the high stiffness, the strong shear capacity, good ductility and the low cost, a new type of GFRP/steel composite box beam was proposed. A given GFRP box beam was used to investigate the effects of adding steel volume ratio (the ratio of steel volume to the total volume in the adding section) on the performance of the GFRP box beam by theoretical calculation, and the adding sections of steel plates for GFRP box beam included top and bottom flanges, and all cross-section, respectively. The analytical results indicate that the performance of GFRP box beam increases dramatically and the cost of beam remains almost unchanged after adding steel plates. At the same time, the performance of GFRP box beam is obviously more excellent by adding steel plates into the all cross-section compared with top and bottom flanges.
The Large Deflection of the Orthotropic and Rectangular Membrane under the External Distributed Load
Authors: Jun Long , Zhoulian Zheng , Changjiang Liu , Weiju Song , Zhang Yin Hui , Zeng Hong
Published: June 2012

This paper reviews research on the large deflection of the orthotropic and rectangular membrane under the distributed load. Through building the theoretical model of the orthotropic and rectangular membrane under the distributed load, the authors deduce the equations set of the membrane which has the effect of pretension and solve the equations set with the perturbation method. The authors obtain the relational expression between the maximum deflection of the membrane’s centre point and the external load, then make a comparison between the large deflection and the small deflection. At last, With the example, the authors analyze the change of the deflection of the centre point of the membrane along the external load, and the length of the side, and the large or small of the pretension and other parameter.
Research on Performance-Based Design Method of RC Structure
Authors: Wan Hai Tao , Zhang Jian Wei
Published: June 2012

Three level and two stage design method is the main seismic design of China, which has continued to use until now. However, the design method lacks specific quantitative performance index of the Reinforced concrete (RC) structure. Comparing with the present internationally advanced performance-based seismic design method, the design method has still a certain gap. In order to develop the performance-based design method at domestic, it is necessary to carry on the refinement to China's performance level of RC structure and quantify essential performance index under different seismic level. In the paper, seismic levels are divided into four seismic levels performance levels of RC structure are divided into four run phase. And then, the story drift angle limit of RC structure in the four run phase is quantified.
Excel Programming and Application for Concrete Filled Steel Tubular Structures
Authors: Wang Fan , Pan Xiao Rong
Published: June 2012

We used to use the method from for the calculation on bearing capacity of steel pipe columns for a review. This paper improves this method, and uses excel in formula programming to calculate the internal forces from SAP2000. It effectively improves the efficiency of the structure designing.
Research on Behavior of Composite Joints Consisting of Concrete and Steel
Authors: Men Jin Jie , Guo Zhi Feng , Shi Qing Xuan
Published: June 2012

A 3-D finite element model (FEM) using ABAQUS was established to simulate the performance of the composite joints with reinforced concrete and steel. Accurate material model, element type, and solution method were discussed in the model. Some composite joints, concrete-filled steel tubular (CFST) column to steel beam, steel tube confined concrete (STCC) column to reinforced concrete (RC) beam and reinforced concrete (RC) column to steel beam were modeled based on the model, respectively. The results from FEM are good agreement with the test results. The mechanism of the composite joint was investigated based on the FEM.
Bond Performance in Machined Reinforcing Bar for Reinforced Concrete
Authors: Bosco Crescentino , Tondolo Francesco
Published: June 2012

Bond between steel and concrete is surely one of the most important aspects in reinforced concrete (r.c.) structures. The structural behavior in general and the formation of the resistant mechanisms in particular, for r.c. structures depends on bond. Normally bond performance has always been related to the relative rib area; in the recent years, a continuous discussion on code specifications regarding the lowering of the limits for the relative rib area (bond index) is under way. The previous values were based on a wide experimental campaign. In general the latter should guarantee a good level of bond in all the common situations. Moreover building industry increased the use of rebar straightening by means of machines used to straighten and shape rebar in coils for use on construction sites. The straightening produces a damage on the ribs that modifies their geometrical properties, essentially due to the action of the rolling line in which a permanent deformation is induced. In the present work, the experimental results of 60 pull-out tests, carried out according with the RILEM testing method, on ribbed reinforcing bars with different reduced rib profile systematically reproducing the straightening process of coil-reinforcing bar produced are shown. Three different diameters are considered: 8, 12 and 16 mm. The behavior in terms of bond strength response is also compared to the Code provisions and then discussed.
Experiment for Attaching Force of a Suction Fan on Various Concrete Wall Surfaces
Authors: Lim Byung Ju , Ham Young Bog , Park Chang Dae
Published: June 2012

In order to measure attaching performance of the suction fan against a concrete wall, test apparatus measuring suction force of the fan was developed. Using this test apparatus, four types of concrete wall specimens were tested to measure the attaching force. The test apparatus consisted of a fan motor, a pneumatic cylinder, a load cell, and sensors for vacuum pressure and a rotating speed of the fan. Vertical wall surface of concrete material were manufactured to four different shapes that is flat, step, rib and embossing type. When the fan is rotating in the fan-housing which is fixed by metal frame, the wall specimen is moved near to fan-housing edge by the pneumatic cylinder. And the specimen may be attached to fan-housing edge by suction force of the fan, and the wall specimen is reversely moved away from the fan-housing edge by the pneumatic cylinder. Then suction force of the fan was measured using a load cell. And the suction force was measured depending on specimen types and varying the rotation speed of the fan. Test result shows that the fan speed is proportional to the suction force, and interestingly, suction force is almost independent from the specimen shapes. The maximum suction force was equally measured with 231.9 N on the step and embossing type surface with 1,800 rpm.
Behaviour of Concrete Filled Steel Tube Reinforced Concrete (CFSTRC) Stub Columns: Experiments
Authors: Li Yong Jin , Ren Qing Xin , Liao Fei Yu
Published: June 2012

Concrete filled steel tube (CFST) reinforced concrete (CFSTRC) columns subjected to axial compression were experimentally investigated in this paper. A total of ten specimens were tested. The main parameters varied in the experiments were steel tube ratio and concrete strength. It was found that, under axial compression, the column ultimate strength increases with the increasing of steel tube ratio and concrete strength. The work in this paper provides a basis for the further theoretical study on the behavior of CFSTRC columns.
Finite Element Static Analysis for Frame of Material Conveyor Base on ANSYS
Authors: Xie Yu , Li Guang Ping , Fan Jiu Rong
Published: June 2012

In this paper, using Solide-edge and Finite element software the model of frame of material conveyor was established, and the static analysis for the frame of material conveyor was analyzed. The deformation modulus and stiffness load in different working conditions was obtained, and the strength of the frame meets the requirements was checked. The reference of frame of material conveyor design was provided.
The Comparative Analysis and Research of the Correction Model on Troposphere Delay
Authors: Dong Chun Lai
Published: June 2012

This paper briefly describes the troposphere delay correction model, It developed a software using the real-time calculation of the troposphere delay corrections modified value. Based on the concept of sensitivity, Respectively on temperature, atmospheric pressure and high Angle variation, drawing analyzes correction effect of three correct model (Hopfield, Saastamoinen and Black), making a reasonable choice model of beneficial conclusion.
Knowledge Sharing in Quality Management
Authors: Zhang Ling Ling , Shang Yu , Luo Hongming , Shi Yong
Published: June 2012

To study the relationships between transferring and sharing of knowledge and quality management based on Juran’s theory of quality loop with the SECI model raised by Nonaka. Suggest that the deployment of knowledge transferring and sharing in quality management would continuously promote its performance. This paper introduces quality management process, the knowledge transfer and sharing mode. In enterprise quality management, realize the effective knowledge transfer and sharing, must also solve incentive mechanism, the quality tools and technical problems.
The Numerical Simulation Calculation of Complicated In-Situ Stress Filed for Borehole Surrounding Rock
Authors: Zhao Wan Chun , Wang Jun Fa , Sun Chen Yan , Li Teng , Jiang Tian Hong
Published: June 2012

In order to accurately simulate the distribution of complicated in-situ stress filed of reservoir using the method of numerical simulation. In this paper, firstly, we have established the injection-production pore pressure model around refracturing well using potential additive principle; secondly, we have established primary fracture induced stress field model, considering that the weakly compressible fluid is filled with the injection-production primary fracture and introducing the elastic coefficient of fluid; finally, we have calculated the distribution of stress around a production well using ANASYS software. The calculating result is accurate and agrees well with practical ones. This method can solve the problem of calculating complicated in-situ stress filed using analytical method, and provides a new method for the subsequent study of stress field.
The Stress Distribution and Calculation of the Different Zone of Wellbore Surrounding Rock Based on the Damaged Theory
Authors: Zhao Wan Chun , Sun Chen Yan , Wang Ting Ting , Liu Yu , Yang Cai Ping
Published: June 2012

In order to describe the stability of borehole face and the theory of hydraulic fracture fissure stretch in real, the stress field of adjacent rock in the hole should be constituted exactly .The article is based on the damnification dynamics theory, meanwhile, considered the rock is fracture-pore dual medium and the damnification characteristic of the rock in hole .Adjacent formation is sectioned three areas: damage-area, damnification-area, elasticity-area. And we have calculated the ambient stress distribution of one oil-well .The results show that the destructive radius of the minimum in-situ stress direction is 1.247m, the damage radius is 8.082m, the destructive radius of the maximum in-situ stress direction is 0.998m, and the damage radius is 6.5865m.
The Research on the K-Factor of Soil Erodibility in Northeast Black Soil Region
Authors: Sun Wei Qi , Liu Zhi Ming , Liu Teng Jiao
Published: June 2012

This article takes soil erodibility factor as the research object, compared with the existing calculation formula. And it takes Yian (in Heilongjiang Province) as an example, quantitatively calculating the specific values of the black soil erodibility factor in northeast district, in order to provide basic data and scientific basis of the black soil for the purpose of conservation and sustainable development of soil and water in northeast district.
Study on Soil Dynamic Parameters of One Site in Shijiazhuang
Authors: Chen Ji Hua , Wu Hui Ge , Wang Wei , Zhou Ai Hong
Published: June 2012

Earthquake effect of the construction site in Shijiazhuang city was studied when the artificial wave is taken as input ground motion. The dynamic parameters in the model were taken from the measured values, recommended values in 94 Code and recommended values by X.M. Yuan respectively. The ground peak acceleration and acceleration response spectra are compared and analyzed, and it shows that the calculation results from the recommended values by X.M. Yuan are more close to the results from the real measured values than 94 Code. The results can be taken as a reference of the soil dynamic value in seismic risk assessment of engineering projects.
Slope Stability Analysis of Jiu-Fen Using Finite Element Method and Limit Equilibrium Method
Authors: Chen Shong Loong , Lin Chun Fu
Published: June 2012

This study simulates the slope stability at Jiu-Fen, using the limit equilibrium method and the finite element method. The limit equilibrium method can find potential slide surfaces and safety factors rapidly. The advantage of the finite element method is that it utilizes more reasonable soil behavior and boundary conditions. A critical slide surface obtained by the limit equilibrium method can be compared with the displacement vector, stress field and location of plastic zone obtained by the finite element method. Furthermore, we can compare the safety factors produced by the two methods. This study shows that the safety factor from the limit equilibrium method is higher than that from the finite element method. The displacement analysis by the finite element method agrees well with the progressive slope failure. So, if we combine the two methods using monitored data in the field, we can analyze slope stability clearly.
Sensitive Analysis of Factors Affecting Soil Slope Stability
Authors: Cheng Yong Chun , Jiang Ping
Published: June 2012

In order to get better calculation parameters for slope stability analysis, as well as provide a better theoretical basis for slope design and reinforcement. In this paper, based on the single factor sensitivity analysis method, the finite difference strength reduction method was taken to calculate the slope safety coefficient when influence factors change. Sensitivity analysis process was explained through a numerical example, the calculation result shows that, influence factor sensitivity of slope stability is related to the value of influence factor.
Analysis on Settlement of Peat Soil Foundation under Well Ditch Treatment
Authors: Xu Yan , Nie Lei , Dai Shu Lin , Lv Yan
Published: June 2012

In order to select an appropriate foundation treatment of peat soil, a theoretical analysis of peat soil foundation under well ditch treatment was conducted. By contrasting the settlements of well ditches and that of no treatment, the results show that well ditch treatment have advantages in acceleration of the consolidation of peat soil foundation. So well ditch treatment is suitable for peat soil foundation.
Mechanism Analysis of Tectonic-Type Ground Fissures in Shanxi down-Faulted Basin
Authors: Xu Ji Shan , Fu Heng Yang , Ma Xue Jun , Tang Dong Qi
Published: June 2012

Shanxi downed-faulted basin mainly consists of Datong basin, Taiyuan basin, Linfen basin and Yuncheng basin, having thick quaternary stratum. Affected by geological structure, topography, stratum conditions and other factors, ground fissure disasters are well developed. Using the development and evolution of tectonic-type ground fissures in the faulted basin as research objects, from the two aspects of horst-graben structure and basal activity of fault belt, this study explored the causes of quaternary ground fissures in Shanxi down-faulted basin. Studying the distribution characteristics, formation mechanism and the disaster-causing effects has the theoretical significance of a better summary and understanding on ground fissures and other geological disasters, as well as providing theoretical basis for prediction and prevention means of the disasters.
Stability Generalized Analysis of a Large-Scale Accumulation Body Slope
Authors: Li Zheng , Liang Xue Jie
Published: June 2012

A large-scale accumulation body, lying in left bank of a hydropower station dam, its stability is directly related to dam construction and operation. By means of engineering geological investigation on geological characteristics and geneses of accumulation body, the result shows the accumulation body is generally stable. Then, safety factor of accumulation body under different working conditions are calculated separately according to the method of EMU, The result shows that side slope is wholly stable and it can meet the stability requirements while the stability of section Ⅲ needs more studies. 3D model is built and applying FLAC program on stability of accumulation body under diverse conditions, it also shows that the whole stability of accumulation body is in a comparatively good condition. However, the possibility of partial slide still exists, and for this reason corresponding protections and reinforcements are proposed at last.
Field Measurement Research on Overburden Stratum Movement and Deformation
Authors: Li Chun Yi , Chen Jie , Wu Hai Feng
Published: June 2012

According to field measurement datum in disturbed overburden stratum of five drillings, disturbed overburden stratum movement characteristics were analyzed. Negative exponent function model of measurement points movement law was also constructed. Moreover, variation law of stratum subsidence speed and relation between overburden stratum subsidence factor and surface subsidence factor were deeply researched. The results show that starting-distance of panel is nearly 70m, bedrock and alluvium subside synchronically and key-stratum isn’t exist in overburden stratum. Also, displacement curve of measurement points in stratum submits negative exponent function model and mutagenesis of surveying points subsidence speed is the key position where face passed drilling 100m. Furthermore, subsidence factor of overburden stratum and surface submits exponent function model.
Study on Slope Surface Shape of Homogeneous Soil Slope
Authors: Wen Sen , Zhao Li Min , Yuan Yu Qing
Published: June 2012

The research on slope is concentrated on stability analysis at present. Although there is little research on slope surface shape, it has important theoretical and practical significance. Based on guaranteeing the same earthwork, the shape of slope surfaces between single gradient slope surface and two-gradient slope surface whose lower part is steeper than upper part are compared. It’s concluded that (1) based on guaranteeing the same earthwork, two-gradient slope surface, whose lower part is steeper than upper part, is stabler than single gradient slope surface and when the lower part is vertical wall, the slope is stablest; (2) the height of vertical wall has a knee point, i.e. when more than this value ,the stability of slope decreases.
Geological and Gas-Content Features of Coalbed Methane System in Qinshui Basin, Shanxi
Authors: Jia Ya Hui , Xie Xiao Ping , Lu Ai Li
Published: June 2012

Colabed methane system is a natural system that consists of coal seams, coalbed methane in them and surrounding rocks. As an unconventional natural gas, reservoir and conservation of coalbed methane are different from those of conventional hydrocarbon. The Qinshui Basin, covering an area about 30,000sq.km in southeastern Shanxi Province, has abundant coalbed methane resources in the carboniferous Taiyuan formation and permian Shanxi formation, with an in-situ methane resource 3.3×1012 m3.In this study, the structural deformation and tectonic evolution of coalbed methane system in Qinshui basin were reported. Relationships between structural deformation and the formation of coalbed methane reservoir in Qinshui Basin were also discussed. The results show that Yangquan-Shouyang area in the north part of the basin and Tunliu-Xiangyuan area in the east are favorable for formation coalbed methane system. In contrast, Jincheng-Qinshui area in the south part of basin and the Qinyuan area in the middle of basin are favorable for both the formation of coalbed methane reservoirs and high yields as well.
The Stability Studies of Soil Slope under the Action of Short-Time Heavy Rainfall
Authors: He Zhong Ming , Zhao Xin Tong , Zeng Ling , Qin Yan Qi
Published: June 2012

Based on the saturated-unsaturated seepage theory and the unsaturated shear strength, the numerical simulations of soil slope seepage field in short-time heavy rainfall was carried out, and on this basis calculated the slope safety coefficient at different rainfall time. The research shows that: the rainfall infiltration will cause the slope soil matrix suction decreased or even disappeared which leads to the slope shear strength reduce; Rainwater infiltration increases the transient water load of infiltration area; and under the dual role of matrix suction reduction and transient water load increasing, the slope safety coefficient has the downward trend obviously.
The Field Measure of Special Strata Freezing Temperature in West Area
Authors: Chen Jun Hao , Zhang Rui
Published: June 2012

A new round of upsurge of mine well construction were set off in the west area, but there are many problems, this article through the field measure of special strata freezing temperature in Bo-jiang-hai-zi coal mine airshaft, use the freezing shaft sinking security information network visualization platform that developed by Anhui University of Science and Technology, analysis several different strata, obtain the overall temperatre decline rate, and compare the difference between in-site shaft well temperature and the calculation value at different position, and difference is very small, it shows that the platform can good response the actual situation. Through calculation, the frozen wall thickness, average of frozen wall temperature, shaft well temperature are meet the engineering design requirement, so propose that in west area at the freezing method mine well construction, the main purpose is waterproof, and use single circle tube freezing can satisfy engineering design requirements.
Principal Characteristics and Failure Mechanism of the Xiaonanhai Rockfall Triggered by the Qianjiang Ms 6.3 Earthquake in 1856
Authors: Cui Fang Peng , Yin Yue Ping , Cui Fang Jing , Tong Ya Nan , Jia Guo Kai
Published: June 2012

Based on field geological survey, engineering geological investigation and other related analysis to the Xiaonanhai Rockfall triggered by the Qianjiang Ms 6.3 Earthquake in 1856, principal characteristics and failure mechanism of the rockfall is elaborated. It is held that its forming process consists of four steps, namely weathering and denudation, shocking and projecting, collapse-slide accumulating and dammed lake formation. It shows that the mass is a result of comprehensive action including seismotectonic moving and field stress, rock mass structure, topography and geomorphology, seismic wave. First of all, rock mass near both Dakuayan and Xiaokuayan which developed three groups tectonic joints forming “X” shape collapsed respectively towards their free faces, about 145º~155º direction. Secondly, diameters of rock blocks in accumulation body decrease from northwest to southeast along 150º direction, and it proves indirectly that the direction of rock mass ejecting is along the same direction.
Actual Example Analysis of Settlement Prediction during Soft Ground Treatment
Authors: Luo Yi Dao , Zhang Yu Cheng , Yao Li Na
Published: June 2012

It is difficult to investigate the geological condition entirely, and the physical and mechanical indexes are inaccurate. All these uncertain factors make both the theoretical and numerical calculation results of foundation settlement different with actual situation. Based on summarizing research results about settlement prediction methods for soft subgrade, actual example analysis is provided with using the measured settlement data to predict the settlement of the soft ground treated by the preloading drainage consolidation method after construction. The analysis method of soft ground settlement during secondary consolidation stage is discussed, and a new calculation model for secondary consolidation settlement is proposed. Considering the different characteristics of the settlement curves during primary and secondary consolidation stages, an improved method is provided to calculate settlement by piecewise curve fitting, and the rationality of the method is verified by analyzing the monitoring data of typical settlement plate in Shenzhen Western Corridor Project. To sum up, in actual engineering practice the settlement developing trends and final settlement can be well predicted with using part of the measured settlement data obtained. Comparing to other methods, settlement prediction with using actual measured data is relatively accurate and reliable. It does not need geological data and the calculation process is simple for engineering and technical personnel to grasp and accept.
Geological Hazard Zoing Evaluation of Typical Sections of Mountain Roads
Authors: Wang Sheng Li , Wang Qiu Shen , Li Lei , Ren Jing Ke , Zhao Jin Ying
Published: June 2012

Based on the S202 a typical section of the geological hazard investigation and the study of fuzzy comprehensive judgement method, this paper make the comprehensive evaluation of geological hazard, and then it makes a partition evaluation ,provides the basis for the section roads of the geological disaster prevention.
Essential Characteristics of Volcanic Rocks of Yixian Formation and Discussion on Tectonic Setting in Chaoyang Basin, Western Liaoning
Authors: Peng Yan Dong , Xing De He
Published: June 2012

Volcanic rocks of Early Cretaceous Yixian Formation were widely distributed in western Liaoning. The Yixian Formation in the Chaoyang basin can be divided into two subcycles from bottom to top. The first subcycle is composed of basalt, basalt andesite and andesite. The second subcycle is composed of trachyandensite and trachyte. The volcanic rocks are characterized by high SiO2, Al2O3, K2O and Na2O, and comparatively low TiO2 components. The volcanic rocks are obviously enriched in incompatible elements (K, Rb, Sr, Zr, Ba, Pb, Li etc.), and depleted in compatible elements (Co, Ni, Cr, V etc.). The volcanic rocks are rich in LREE. There is a slight low Eu negative abnormality and low Ce negative abnormality. Based on t he studies of petrology and geochemistry, volcanic rocks of Yixian Formation belong to the high-K calc-alkaline magmatic serious. Comprehensive study of regional structures and geochemistry of volcanic rocks, the volcanic rocks of Yixian Formation were generated in the environment of lithosphere inhomogeneous extension, as a product of the intraplate orogeny of Yanshan Mountains.
Application of a Crust Layer for Improving Dredge with Vacuum Pressure
Authors: Yan Shu Wang , Guo Bing Chuan , Sun Li Qiang , Li Wei
Published: June 2012

When the vacuum preloading method is applied to improve dredge fill, adequate bearing capacity has be provided for the PVD installation equipment. It is found that filling the dredge surface with a certain think of silt sand can provide enough bearing capacity to support the PVD installation performance. A small scale model test is carried out, which can intuitively demonstrate the effect of this technique. Finite element analysis is performed in which the developing of the plastic zones and the displace vectors can be predicted. The calculated bearing capacity is compared with the conventional analytical solutions achieved by Vesic. The bearing characteristics of the soft soil foundation with a crust layer is discussed, which can provide the technique with a solid theoretical background.
Moisture Content of Crude Oil Based on BP Neural Network Algorithm to Predict in Oilfield
Authors: Zhou Ying Ming , Wang Qiu Shi , Wang Peng , Yao Li Na
Published: June 2012

This paper proposed new method of testing a moisture content of the crude oil which is based on BP neural network. It describes the principle of BP neural network model and calculation method to predict the moisture content of crude oil. The normalization of evaluation index and the implementation process of this method in computers. In the end, an application example of this method used in the process of practice and precision control requirements.
Suction Force in the Bottom of Spudcans Resting on Silty Sediments
Authors: Tang Xiao Wei , Wang Zi Bin , Zhang Xi Wen
Published: June 2012

As the development of exploiting marine resources, many ocean platforms were built. But there is still a problem unsolved completedly. The suction force between seabed soil and ocean platform perplexed jackup technically and is discussed in the article. The comparisons between model experiments and Skempton's Model are much helpful to realize the significance of suction force.
The Selection of Foundation Type of Large Cross-Section Wire of Transmission Line Iron Tower in Mountain Areas
Authors: Zhang Yuan Liang , Zhang Yi Hu , Ge Ya Ping
Published: June 2012

For difference of elevation of transmission line in mountain areas, special considerations are needed for foundation design and construction.Take double-loop wire of 2×400 and mixed voltage four-loop wire of 2×630 iron tower as analysis examples, material quantity and economy index of different types of foundation in mountain areas are analysed in this paper so as to provide inference information for electrical construction.
Research of Difference Analysis Method of Constructed Wetland - By Xiaosha River as Example
Authors: Liu Chao , Deng Li Rui , He Hui , Bian Lei
Published: June 2012

This paper taked Xiaosha River constructed wetland as the study object, the difference of the constructed wetland and Xinxue River constructed wetland as a demonstration project were studied theoretically by constructed wetland model, virtual data were constructed and amended by the difference. The application of constructed wetland differentiation during actual modeling process was studied. In the actual project, there was important guiding meaning on design, construction and operation management of the constructed wetland in this study.
Based on GIS and Neural Network of the Geological Disaster Harm Division in the Western Region of the Himalayas
Authors: Liu Chong , Wang Gang Cheng , Xu Wen Ming
Published: June 2012

The hazard evaluation index system is divided into basic factors and vulnerability factors, According to the actual data collected in the Himalayas Geological Survey and the main factors index of geological disaster harm degree in study area were extracted in accordance with the evaluation index system. Using GIS to digitize, statistic, overlay, merge, classify and spatial analysis the basis of geological data. The weight of each evaluation factor can be exhibited according to the prediction to disaster survey points using BP neural network and the training and testing of the sample data using neural network inversion process, then the hazard evaluation to the research area can be processed by using this weight to have a direct overlay analysis. The regional hazard evaluation was completed using disaster points and area statistics. There is a realization of the evaluation unit grid, factor comparison, factor overlay, and an accomplishment of the facture about the thematic maps of evaluation results according to the secondary development of MAPGIS.
The Seepage Risk Analysis of Surface Runoff Caused by the Shallow Thick Coal Seam Mining
Authors: Zhang Shun Feng , Hu Rui Lin , Wu Xiong
Published: June 2012

As for shallow thick coal seam, the overlying strata can not form steady structure and will break down until reach the surface ground, which will induced large ground deformation and fractures in the overlying strata during the mining. Under the condition of strong rainfall, surface runoff will influx to the collapse pit or supply to other aquifers, and inrush into the roadway through water flowing fractured zone. This paper takes the 4201、4301、4302、4303 and 4401 coal faces of JingDong mine area in PingShuo for example, predicts the range of ground subsidence、settlement and the height of water flowing fractured zone dynamically after coal face mining, with the Flac3D numerical modeling software. On the base of result above and combined with geomorphic characteristics and hydrologic geology of the mine area, the author analyses risk of surface runoff seepage and put forward a dynamic water drainage design to prevent mine water bursting, which offers scientific foundation and data for safety production of the mine .
Dynamic Response Analysis under the Metro-Vibration Loading of Xi'an Bell Tower Timber Structure
Authors: Meng Zhao Bo , Zhao Teng Fei , Cui Shi Cai , Jin Jie
Published: June 2012

Taking Xi’an Bell Tower and metro line 2 as research background, at first, according to the theory of Euler-Bernoulli beam in Winkler foundation, the analysis model of train-track-foundation system was established, and then, time-history curve of metro-induced loading acts on tunnel structure is obtained by using Matlab produce platform. Secondly, two-dimensional finite element model of the structure-soil-tunnel interaction model was established using ANSYS. Taken loading time delay into consideration for the first time, dynamic response law of the bell tower under the metro-vibration loading is obtained. Finally, the impact of metro line 2 on Xi’an Bell Tower was evaluated according to the Technical specification for protection of historic buildings against man-made vibration.
Study on the Technology Coefficient of Supporting for Deep Coal Mine Tunnels
Authors: Zhang Wei , Chen Shi Hai
Published: June 2012

To keep the stability of tunnel’s surrounding rock, and control the deformation of surrounding rocks and reduce the maintenance cost of tunnel in maximum, this article did the following aspects. Aiming at large pressure , large deformation , bad maintenance state in deep coal mine tunnel , joint cable anchor support technology is adopted , and the coordination deformation of tunnel is accomplished through anchor net-surrounding rock and its coupling with the anchor cable .Through the theoretical calculation and numerical simulation of cable anchor coupling support ,we determine reasonable technology coefficient of bolt supporting and verify the correctness of support coefficient by field observation.
Prediction of Blast-Induced Ground Vibration Using Support Vector Machine by Tunnel Excavation
Authors: Li Dong Tao , Yan Jing Long , Zhang Le
Published: June 2012

Beijing East Road No.1 tunnel in Guiyang city has the most complexity in arround, so prediction and control the blasting vibration is the most important task. In order to improve the accuracy of the prediction of the blasting vibration to mitigate the possible hazard in tunnel construction, studied on method of predicting peak particle velocity (PPV) using support vector machine (SVM) and established regression prediction model based on SVM. Comparisons between the predicted PPV using the empirical equation regression and SVM was made, find that the SVM gives much better prediction of PPV than does the empirical equation regression.
Study on Sub-Level Classification Method of Road Tunnel Surrounding Rock According to the Hierarchical Cluster Analysis
Authors: Yan Ming , Nie Lei
Published: June 2012

Road tunnel surrounding rock classification is the basis of choosing tunnel construction methods and designing support lining. Both in domestic and foreign countries, there is a wide variety of classification methods, which the engineering analogy of more general use. Our national standard BQ method is a semi-qualitative and semi-quantitative engineering analogy classification method. Less due to its classification category, it is difficult to meet the construction needs. Therefore, with an example, three indicators which get a low correlation were used to divide level Ⅲ、Ⅳ and Ⅴ into different sub-levels by hierarchical cluster analysis method. The study is a complete and optimization on the existing road tunnel surrounding rock classification methods, and provides new guidance for the actual construction.
An Effective Method of Evaluating Safety of Adjacent Buildings Influenced by Metro Construction in Beijing
Authors: Sun Xi Yuan
Published: June 2012

With the growing demand for public transportation in big cities, metro construction is developed rapidly. It is much important to keep the adjacent buildings safe in the course of metro construction. In this paper, an effective method of evaluating safety of adjacent buildings influenced by metro construction in Beijing is suggested. It is composed with collection of related data, analysis of geotechnical condition, detection of building appearance quality, measurement of existing building, control standard of subgrade deformation and numerical prediction. Finally, an example is given to explain this method in detail.
Three Dimensional Elastic-Plastic Numerical Simulation of Tunnel Excavation Sequence of Dalian Speed Railway
Authors: Jiang An Nan , Yang Hong Wei , Xin Hong Fu , Bai Bing
Published: June 2012

Dalian speed railway tunnel is located in complex soft rock and soil, the road foundation deform and surrounding rock stability control is a concern problem. Along with the unloading process of excavation, surrounding rock moving to inner hole, while exceeding the elastic limitation, the plastic deform and the surrounding rock destroy then occurred. The paper adopted three dimensional elastic-plastic method based on Mohr-Coulomb yielding criterion and carried out numerical simulation of excavation process, in order to analyze and compare the surrounding rock vertical displacement contour, ground surface settlement and damage zone corresponding to different construction sequence. The elastic-plastic numerical method can reflect the damage and destroy character of nonlinear soil material of surrounding rock corresponding to different construction scheme, the simulation result has active guiding meaning for the Dalian speed railway tunnel construction design and dynamic analysis.
Mass-Spring-Damping Model of Saturated Sands
Authors: Wu Li Xiang , Hou Xing Min , Zhang Jia
Published: June 2012

Based on the theory of elastic wave in saturated soils, the vertical vibration of a rigid circular footing resting on saturated sands is studied to obtain its analytical solution of dynamic compliance coefficients. Considering the role of water in the soil, the mass-spring-damping model of saturated sands is proposed to realize a practical way for engineering. And the stiffness and damping coefficients of model are calculated by reciprocity law equation. Compared with the solution of elastic half-space with the same Poisson’s ratio, the coefficients of the saturated sands are quite large. To comply with engineering practice, the approximate formula should be modified with multiplying them by factor in the Code for Dynamic Machine Foundation Design.
Research on the Orthogonal Test of Tunnel Supporting Parameters Based on the Finite Element Strength Reduction Method
Authors: He Peng Li
Published: June 2012

In this thesis, considering the double-hole parallel tunnel engineering with super-small interval, the optimization of designed supporting parameters are studied by the strength reduction finite element method. The calculated safety factor by using the strength reduction finite element method was considered as the index of the tunnel surrounding rock stability, and by using the orthogonal finite element experimental method, the parameters are analyzed and the optimal values of bolt and spry cement are given. The excavation and supporting process under the optimal supporting parameters is simulated, and it indicates that the optimal parameters not only could ensure the stability of the tunnel surrounding rock, but also could decrease the cost of the engineering comparing with the original design project, and there is reference value for analogous engineering.
Optimization of Reasonable Interval of Parallel Tunnel
Authors: Guo Li , Li Hong Fang
Published: June 2012

To acquire the stress distribution of surrounding rock is the important mean of stability analysis and the major task of numerical simulation. But the breaking probability cannot be expressed by the magnitude of single stress straightly. Based on the Mohr-Coulomb theory, coefficient S was deduced and used for further treatment of the result of numerical simulation. Models of parallel tunnel with different interval were building and analyzed. The different distributions of coefficient S were compared and analyzed after numerical calculation. The more reasonable tunnel interval was given, which can be a reference for optimization of design of similar projects.
Study on Fire Design in Xuefengshan Highway Tunnel
Authors: An Yong Lin
Published: June 2012

The fundamental principle for tunnel fire fighting design is to ensure the safety of people’s escape from tunnel fire. Therefore the computer model Tunev (tunnel evacuation) for the people's safe escape was developed. In order to evaluate evacuation safety, Fire risk times Tfire was firstly gotten through simulations of a middle size fire, whose heat release rate (HRR) was 20MW, with a longitudinal velocity of 3m/s suggested in Code for Design of Road Tunnel of 2004, and evacuation times Tevacuate was calculated by an empirical formula in the Togawa evacuation model. Meanwhile, fire spreading to other cars was analyzed by radiation theory. Finally, cross passage spacing was optimized in a method of evacuation safety evaluation. Results are given as follows: Tfire equal to 290s are bigger than Tevacuate equal to 267s, the smallest igniting spacing between cars is 13m, and the optimized cross passage spacing is 290m. All those are shown that: evacuation is safe, and to some extent code is testified correct.
Study on Deformation of Rock Tunnel Face
Authors: Wen Sen , Yan Chao , Yuan Yu Qing
Published: June 2012

Few researchers study on deformation of rock tunnel face. The tunnel face is stable for small section shallow tunnel, but it shouldn’t be ignored when tunnels for large diameter are driven in weak rock mass. In this paper, dilatancy angle taken into account, FLAC3D is used to do 100 groups of numerical tests which are designed by orthogonal design method. According to test results, the formula for maximum deformation of tunnel face and test parameters are fitted by nonlinear regression method. Test value and predictive value have good correlation.
Study on Deformation Characteristics of Dark-Brown Weathered Basalt Soil in Guizhou
Authors: Wang Can Song , Lei Xue Wen , Meng Qing Shan
Published: June 2012

There is the dark-brown weathered basalt soil widely distributed along the slope surface of highway in Guizhou and its settlement is obvious under rainfall, which threatens the slope stability, while due to insufficient systematic study on its deformation characteristics, it hinders the highway’s construction in this region.The influence of its water content and dry density is studied by the standard consolidation test both of undisturbed soil and remolded soil under different water content and dry density conditions and its compression coefficient and rebound index are obtained, which provides a reference for slope stability analysis.
Research on Techniques and Experiments of Electrostatic Radon Elimination in Underground Engineering
Authors: Geng Shi Bin , Qi Wei , Ouyang Te Hui , Liu Qiu Lin
Published: June 2012

The research status of radon elimination techniques at home and abroad in recent years is introduced. The feasibility of electrostatic radon elimination in underground engineering is analyzed. The technical problems of reducing radon and its daughters and such harmful substances are analyzed. The type of cellular and flat field dual-zone in electrostatic radon elimination is investigated. The dual-zone radon elimination equipment is designed and related tests are done.