bluuebunny/crossref_metadata_2025 huggingface dataset:
Weak Form Quadrature Element Analysis of Diaphragm Walls
Authors: Li Ye , Zhong Hong Zhi
Published: July 2014

In combination with Rankine's earth pressure theory, a weak form quadrature element formulation is established for analysis of diaphragm walls. Results are compared with those of Paroi2, a finite element software package for diaphragm walls, to demonstrate the effectiveness and the advantages of the present formulation. Accurate results are obtained with only a few weak form quadrature beam elements, contrasting with dense finite element division that is needed for complex load distributions over the diaphragm wall.
A Critical-Line-Based Predictive Model for Landslides
Authors: Kung Gordon Tung Chin , Tang Yu Geng
Published: July 2014

This paper developed a critical-line-based method for predicting the occurrence of landslides using two rainfall indices, the rainfall intensity and the accumulated rainfall, based on four landslide case histories recorded in a county. Specifically, the rainfall records of the four cases were used to compute the 60-minute rainfall intensity and accumulated rainfall prior to the occurrence of landslides. Although the meteorological and geological conditions as well as other crucial factors are not considered in the development of the intended model, the analysis results indicated that the developed critical-line-based predictive model can reasonably identify the boundary between occurred and non-occurred zones. The developed model has the potential to be a useful tool for predicting the occurrence of landslides according to the rainfall conditions.
Analysis of the Interaction of Foundation Pit Supporting Structure and Soil
Authors: Feng Yu Qin , Liu Chen Xi
Published: July 2014

This paper analyzes an engineering in an area of China which was processed by vacuum preloading technology in the silt soft soil. This engineering was used rigid supporting structure technology of piles in row and bolts for large area of deep foundation pit supporting. It compared the realistic measure soil pressure and theoretical concluded soil pressure, and got the soil pressure distribution mode which is suitable for silt soft soil processed in this way. The conclusion can provide a reference for similar supporting structure system to calculate earth pressure.
Analysis on Influencing Factors of Cement Stabilized Macadam Base of Compressive Strength in Shenyang Area
Authors: Xu Yan , Bai Chun Zhen , Zhang Yi Fang , Liu Xiao , Li Di
Published: July 2014

The compressive strength of cement stabilized macadam base is an important index to evaluate the quality of road construction. In this paper, investigation and field sampling were conducted on roads in Shenyang city, and, indoor experiment study was then adopted to analyze effects of particle grade, cement dosage, molding method, compaction and curing age on compressive strength. The results show that rational particle grade greatly enhances the strength. Strength of vibration molding sample is closer to the field sample strength and is 0.6 times bigger than that of static pressure molding sample. 1% increment of construction compaction degree will induce 10% increment of compressive strength. Increment of cement dosage and curing age will induce increment of compressive strength, but the effect is limited. Studied in paper can provide a theoretical basis for site construction in Shenyang area.
Experimental Study on Dynamic Characteristics of Tailings
Authors: Zhao Jian Bin , Ji Ying Chun , Liu Xiao , Li Di
Published: July 2014

In this paper, the dynamic characteristics for three different kinds of copper tailings are studied through a series of cyclic triaxial tests. It is found that under confining pressure 200 and 300 kPa, elastic modulus raises with the increasement of coarse grain content to a certain degree and then declines, and the maximum elastic modulus corresponds to good gradation. While, as for confining pressure 100 kPa, elastic modulus raises with the increasement of fine grain content. It is also found that elastic modulus raises with the increasement of confning pressure. And, damping ratio raises with the increasement of shear strain and finally to a stable value. Finally, the fitting Gd/Gdmax~ curve for three kinds of tailings shows the reasonableness of test results.
Roadbed Treatment Research in Expansive Soil Area
Authors: Feng Zhen , Li Cong Jie , Gao Xue Li
Published: July 2014

This paper elaborate the bad geological characteristic and the huge disaster caused by expansive soil. When constructing the road or railway in expansive soil area, the roadbed disease such as slope stability failure,roadbed settlement,mud pumping,ballast bag and so on is elaborated. The expansion and shrinkage mechanism of expansive soil has been studied from such aspects as physical-chemistry-mechanics effect, material composition, external influencing factors and so on. In expansive soil area, such expansive soil treatment and reinforcement methods as physical improvement, chemistry improvement, biological improvement are summarized and proposed.
Stability Analysis of Tower Foundation for Transmission Line
Authors: Chen Zhen
Published: July 2014

On basis of geological hazard survey for dangerous tower foundations of transmission line in the sphere of influence of some goaf, stability analysis is conducted for dangerous towers by use of statistical approach in accordance with relevant regulations, to propose recommended treatment measures. The method suggested in this paper can provide references for stability analysis on dangerous towers of transmission lines. The recommended measures can be served as a reference for actual projects.
Study on the Stress and Strain of EPS Silt Light-Weight Soil by Laboratory Test
Authors: Feng Yong , Pei Yu Bin
Published: July 2014

EPS is silt mixing light-weight soil by expanded polystyrene, curing agent, mixture mixing and has a certain strength, lightweight synthetic packing. This article is based on laboratory test, using the uniaxial and triaxial compression test on the relationship between stress and strain, research has shown that the strain values are greatly influenced by the EPS content ratio, strength is mainly composed of cement mixing ratio control. Triaxial test results show that only when the cement mixing is larger, mixed soil shear strength characteristics with general soil has a great deal of similarity.
The Experimental Study of the Influence of the Matric Suction on the Unsaturated Soil Strength
Authors: Liu Cui Ran
Published: July 2014

With modified unsaturated soil triaxial apparatus, unsaturated soil shear strength of the tests under the condition of different water contents are done. Experimental results show that the matric suction exist in unsaturated soil and increases with the decrease of moisture content. And the shear strength of unsaturated soil is higher than that of saturated soil. Shear strength of unsaturated soil varies as the matric suction and water content. The shear strength increases when the matric suction increases. when soil tend to be saturated, the matric suction will tend to be zero. And the shear strength of unsaturated soil values gradually close to the strength of the saturated soil.
Analyses of Anti-Seepage Measure for Expansive Soil Subgrade in Hefei
Authors: Wei Yuan , Xing Wei Zhong , Shao Yan
Published: July 2014

Deformation of expansive soil subgrade depends on moisture content. Anti-seepage measure of unsaturated expansive soil was carried out using ABAQUS as for the influence of atmosphere. The results show that there is large change in water content using anti-seepage measure measure. After using anti-seepage measure, range of water content decreases. At the same time, range of water content value obviously decreases with the increase of the depth of seepage control. Therefore, damage of pavement caused the deformation can decrease by seepage control measure. The results could be used for engineering design and numerical calculation.
Effect of Variable Permeability Coefficient on Consolidation of Ultra-Soft Ground under Vacuum Preloading
Authors: Xu Bin Bin , Liang Ai Hua , Li Ming Ying
Published: July 2014

In this paper, a soil-water coupled finite element analysis incorporated the macro-element method is carried out to investigate the effect of variable permeability coefficient on the consolidation of the ultra-soft ground using vacuum preloading. Sys cam-clay model is employed as the constitutive model of the ultra-soft soils. When the drain space becomes from 60cm to 40cm, there is significant acceleration in the numerical settlement of the ground using the constant permeability coefficient, which is quite different from the observational results. When the variable permeability coefficient where a liner relationship between the void and the logarithmic value of permeability coefficient is adopted is employed, there is a good accordance between the numerical and observational settlements. According to the distribution of variation in the void, the largest variation in the void occurs at the top several layers and therefore the predominant settlement can be attributed to the volumetric compression of the top several layers.
Application Research on Distributed Optical Fiber Monitoring Technology in Static Load Test of Large Diameter and Post-Grouting Filling Pile
Authors: Chen Jia Xing , Zhou Tong He , Guo Yuan Cheng
Published: July 2014

The Static load test of the post-grouting filling pile in Zhengzhou city’s third ring road rapidness project, uses strain gauge and distributed optical fiber to track and monitor the evolution rule of load-settlement, pile body stress, pile side resistance, etc., interprets bearing properties of large diameter post-grouting filling pile, contrasts and analyzes the monitoring data obtained by optical fiber and strain gauge at the same time. The result shows that, the monitoring effect of the pile body stress obtained by distributed optical fiber technology is superior to the strain gauge, but the data of them still needs to verify each other.
Coaction Analysis on Pile-Net-Cushion-Soil
Authors: Wang Rui Fang , Wang Ke Yu
Published: July 2014

In accordance of the principles of stress continuousness and displacement coordination, the interactions model of pile and pile, pile and soil are set up;Accoring to the symmetry of the models,1/4 of the models are extracted to set up three-dimension multipile composite foundation models.The flexibility matrix of the three reinforcements are modified to build a global flexibility matrix with the consideration of cushion's compression; Interaction coefficients of the analytic calculation are lower than those of the finite element when pile lengthen is diversity.The comparison between the on-site measured data from the literature review and results of the analytic calculation shows the settlements in the analytic calculation are smaller than those in the measured data, and the model measurements are very close to the curves from the analytic calculation. All these prove that the analytic methods proposed by this research are accurate and may function as a reference to engineering.
Experimental Study on Post-Peak Failure Behavior of Rock Masses with Persistent Joint
Authors: Wang Lei , Yu Jiang , Hua Xue
Published: July 2014

The uniaxial compression test on pre-existing persistent jointed rock cylindrical standard specimen made by high stiffness servo control testing machine, systematic researched the relationship between jointed rock post-peak stress-strain curve, the destroy form of rock masses with dip angles of persistent joints. And the results reveal that: (1) The post-peak stress - strain curves of specimens with joint inclination angle of 15°and complete specimens are basically the same, but the difference of post-peak stress - strain curves of specimens with the joint inclination angle from 30°to 60°and complete specimens is vary greatly; (2) The post-peak failure modes of specimen change with different joint inclination. The research result can reflect mechanics and deformation and damage characteristics under uniaxial compressive loading in the phase of post-peak of rock masses with different dip angle pre-existing persistent joints.
Finite Element Analysis of Rock Bolt Foundation in Metallurgical Industrial Plant
Authors: Tan Meng Xi , Liu Hong Bin
Published: July 2014

Based on the application of Rock Bolt Foundation in metallurgical industrial plant foundation design, this paper utilized bolt deformation formulas that derived by Gu Shuancheng and others to calculate deformation of rock blot. The result is consistent with the experimental value, the authors can further verify the experimental and theoretical calculation value eventually by finite element analysis software ANSYS, which provides a reference for practical application of rock bolt foundation in metallurgical industrial plant.
Laboratory Studies on Acoustic Emission Characteristics to Coal Dynamic Response under Variable Accelerative Load
Authors: Liu Xing Hui , Liu Chuan Xiao , Zhuang Shuai , Wang Long , Lin Shu Seng
Published: July 2014

To simulate the fracture of the coal under impact load, uniaxial pressure test of coal which retrieved from KongZhuang coal mine-DaTun coal and electricity Company of China coal group was done in the manner of strain control which rest with a function of uniform variable acceleration. Through researches on the stress-strain relationships and acoustic emission characteristics, the relationship between ring count rate and time series was founded, and the process before failure of coal was divided into four stages: low-level ringing count rate, higher level, highest level and peaceful period. Through the comparison and analysis, it is founded that acoustic emission characteristics in the stage of higher level of ringing count rate can be regarded as a basis for the prediction of coal fracture. According to three obvious rise stages of acoustic emission signal in the process before failure of coal, growth factor of climbing speed is introduced and the values are calculated between 2 to 4, and it is conferred that the value of is proportional to compressive strength of coal and loading rate. It is of great significance for the prediction of coal fracture by acoustic emission characteristics in the stage of new cracks.
Application of Curve Model Fitting Methods to Settlement Prediction
Authors: Wu Ming , Niu Jia Lun
Published: July 2014

Both Hyperbolic model and Logistic curve model have certain applicability to settlement prediction of soft sub-grade. Based on the observational settlement data of soft sub-grade in an industrial zone, the features of Hyperbolic model and Logistic curve model are studied. By using curve fitting methods with Origin software to predict the sub-grade settlement value and analyze the simulation results, compare these two models to determine which one is more reasonable. The results show that the Logistic curve model is more accurate and reasonable, it has the value of popularization and application in engineering.
Numerical Simulation of Failure Process on Soil Slope with Different Support Measures
Authors: Zhang Yu Wei , Tang Lie Xian , Bai Da Chuan , Zhou Peng
Published: July 2014

In conventional analysis methods of soil slope, we must presume potential sliding surface at first and then gain the safety factors, judge the stability of slope by the safety factors. In fact, if we know a slope is unstability but don’t know where will be slide or failure, we can’t adopt effective measures to support and prevent the sliding accidents appearing. This paper use RFPA-Centrifuge to numerical simulate the failure of soil slope with different support measures without presume any potential sliding surface, success to gain the failure process and the corresponding safety factors. From the calculate results of RFPA-Centrifuge, we can find where is the first failure point and all the slide mass. So if we can use good analysis software to simulate the failure process of slope and adopt corresponding support measures before the engineering beginning, the stability of slope will be better and the accidents will be disappeared or reduced.
Probability Statistical Model and Network Simulation Technology of Random Fractured Rock Mass
Authors: Han Chun Xiu , Zhou Dong Hua , Liao Wen Yuan , Chen Xu , Li Long Qi , Yao Kai Cheng
Published: July 2014

Based on field investigation of random fractured rock mass, the sample parameters are put to statistical analysis, and 2-D fracture network model is established with probability-statistics theory and Monte-Carlo simulation technique. Finally, 2-D fracture network model is formed, which gain fracture distributed regularity in statistical sense, and is of important meaning to describe the fracture geometrical characteristics.
Experimental Study of Static Disintegration on Unsaturated Soil
Authors: Wang Nian Qin , Wang Qing Tao , Xue Qian , Liu Xiao Ling
Published: July 2014

In order to explore the disintegration characteristics of compacted loess, through the unsaturated soil disintegration instrument by independently developed,conduct the soaking disintegration experimental study on remolded soil unsaturated samples,obtained a series of experimental results:①The curves can be divided into the slow disintegration, rapid disintegration and stabilization of disintegration in three stages，the degree of compaction and water rate impact on rapidly disintegrating stage;②When the degree of compaction is certain,the disintegration rate decreased with the water contented increasing,the decreased amplitude is increasing with the moisture content increased to18%,the disintegration characteristics disappeared with the moisture content increased to 22%;③When the initial moisture content is certain, the disintegration rate decreased with the degree of compaction increasing, The time significantly prolonged when the disintegration completed. the decreased amplitude is increasing with the degree of compaction increased to 95%,the disintegration characteristics basically disappeared. Based on the relationship of degree of compaction and the moisture content to void ratio, the thesis establishes the model between the disintegration rate and the effective porosity ratio,the formula can be used to calculate the disintegration rate of compacted loess.The specific conclusions are:①When the critical moisture content increased to 22%,the disintegration characteristics disappeared;②When the critical degree of compaction increased to95%，the disintegration characteristics also disappeared.
Research on the Effect of One Debris Flow along Bailong River
Authors: He Yong Qiang , Wu Yun , Li Su Ling
Published: July 2014

Earthquake can cause heavy casualties and property losses immediately, and induced a mass of secondary mountainous disasters such as collapse, landslide and debris flow. Collapse and landslide provide abundant incompact solid matter for movement of debris flow directly, which makes the debris flow ravines be active in a long period in the future. Taking one debris flows on Bailong River as an example. Based on the analysis of the valley features and the forming condition scientific prediction for the trend of the debris flow activities and estimates the hazards situations have been achieved.
Study on Optimization of Design Parameters for Composite Foundation with Cement-Fly Ash-Gravel Piles
Authors: Luo Peng Fei , Tong Jian Xing , Sun Xun Hai , Yang Xin Hui , Zhang Jie , Yan Ming Li
Published: July 2014

Based on theoretical analysis and experimental result, the principle as well as the interaction between pile and soil, the design parameters of composite foundation with cement-fly ash-gravel piles (CFG piles for short) are optimized, which are pile length, pile diameter, pile spacing, pile strength and thickness of cushion layer, in order to put forward the reasonable design parameters for reaching economic and reasonable target. Through the optimized analysis, it is put forward that bearing stratum of pile tip should select a relatively better soil layer, the diameter of CFG pile is usually appropriately to select between 350mm and 500mm, it is usually appropriately to select larger pile spacing under the permissible range between 3d and 5d being ruled by standard, it is appropriately to enlarge the pile diameter to reduce the requirement of pile strength in high rise and super high rise building which requiring bearing capacity of single pile is high, and the thickness of cushion layer is appropriately to select between 0.4 and 0.6 times of the pile diameter.
Study on the Effects of the Rainwater Seepage on Slope Stability
Authors: Xun Ju Sheng , Xu Xiang Tian , Bai Rui Qiang
Published: July 2014

The work condition of the highway, which is usually built in mountainous regions, is complex relative to the ordinary road. Slope instability accident caused by the seepage of rainwater usually occurred in the rainy season. The mechanism for seepage failure of slope was investigated by used the Mohr-Coulomb criterion and the principle of effective stress. The effect of rain intensity on slope stability was equivalently instead by the effect of moisture content on slope stability. The influence of moisture content on the safety factor of slope stability was further calculated according to the Bishop’s method. The degeneration of safety factor follow to the moisture content was presented in the percentage.
Study on the Lateral Displacement of Super-Long Pile under a Asymmetrical Surcharge Load in Soft Clay
Authors: Li Qi , Lu Xiao Li
Published: July 2014

The pile will have a large lateral displacement in soft soil under the role of heaped load. Based on Biot consolidation theory, combined with a certain highway project, a three-dimensional FEM model is established, the process that the soil lateral deformation under heaped load lead to the pile side displacement was simulated. On the ground of the former result, the influence factors for the displacement of pile top and the pile displacement field distribution are analysed. The results show that, the building load area, load grade and the distance from loading area to pile have a major influence on the pile side displacement. On the other hand, the load on pile top have a very small contribution for stability of anti side displacement. The buildings nearby the area of pile foundation should be given attention in practical engineering.
Temperature Field Numerical Analysis of Different Freeze Pipe Spacing of Vertical Frozen Soil Wall Reinforcement at Shield Shaft
Authors: Hu Jun , Jiang Bao Shi , Zeng Hui , Chen Ya Nan , Zhu Yun Yun
Published: July 2014

Determining the freezing pipe spacing, the freezing reinforcement required range and method, acquiring the development and distribution patterns of frozen soil wall temperature field are the key issues needed to be addressed when using vertical freezing method for the soil reinforcement at shield shaft. Based on the shield launching project of the cross-river shield tunnel of Nanjing subway line 10 and the finite element numerical analysis software, the development and distribution patterns of different distance between freezing pipes of the vertical frozen wall are studied. The numerical simulation shows that, it is feasible to use the numerical model to simulate the temperature field of vertical frozen wall. Decreasing the distance between freezing pipes causes a greater impact on the temperature field. When freezing pipe spacing increases to 0.1m, frozen wall cross-lap time increases of about 1 day. With the freezing pipe spacing increasing, the cross-lap time increases linearly. The temperature of frozen wall decreases with the distance between freezing pipes decreasing, and the strength of frozen wall is more uniform. Results and conclusions form this research may play a useful role to aid designs of similar projects in future.
The Applied Research of Underwater Vacuum Preloading Method in Soft Soil Foundation
Authors: Feng Yu Qin , Zhang Lu
Published: July 2014

On the basis of engineering project using underwater vacuum preloading method to strengthening the soft foundation, under the specific geological conditionsthis article analyzes the construction technology and reinforcement mechanism of underwater vacuum preloading of the soft soil foundation. By indoor soil test of Reinforcement of soil before and after processing, compared the change and improve of soil shear strength indexes before and after the reinforcement, it is verified that the underwater vacuum preloading method is a effective mean in handing soft ground, and can be further promoted as a means of handling soft ground along the coastal area of China.
The Bearing Characteristics and its Influencing Factors of Reinforced Soil Foundation
Authors: Jiang Yang , Wang Xiao Mou , Sun Wen Bin , Dong Yun
Published: July 2014

The reinforced soil foundations have been widely used in various geotechnical engineering applications, such as bridge approach slab, bridge abutment and so on. However, many problems of reinforced foundation still need to be solved and the behavior of the reinforced foundation requires further study. Therefore, finite element analyses were conducted on unreinforced and reinforced clay subgrade soil to evaluate the influence of various factors affecting the performance of strip footing on studied soils. Conclusions are drawn: the effective reinforcement depth is about 1.5B for the reinforced soil and it is independent of the geogrid type; At a given settlement, the bearing capacity of the footing decreases with the increase in reinforcement spacing, with larger decrease rates at small spacings; A geogrid with a tensile modulus ranging from 5MPa to 25MPa will maximize the benefits of the reinforced soil footing, etc.
The Instability Mechanism of Soil-like Slope under the Action of Acid Corrosion in Open-Pit Copper Mine
Authors: Ju Hai Yan , Gao Gui Qing , Liu Shao Lin , Luo Chang Tai , Li Jian Hua
Published: July 2014

Combined with the engineering geological conditions and geological characteristics of soil-like slope in a certain open-pit copper mine, based on the experiments and theoretical analysis, the instability mechanism of soil-like slope under the action of acid mine wastewater is researched. Because the acid wastewater goes into the weak structural plane, reacting with the constitutional materials and fillings in slopes, the react change the microstructure of the rock and soil, and replace, dissolve the components, causing the cohesion and internal friction angle of slope reducing eventually and slope failure.
Stability Monitoring Analysis on Side Slope Engineering Management of Longmenhao Primary School
Authors: Wu Li Ming , Wang Zi Jian , Liu Shi Yang
Published: July 2014

Through doing spot monitoring on stability of slope engineering management of Longmenhao Primary School, this paper does analysis on monitoring data for one month. Analysis results show that all of accumulation maximum displacement, change rate of horizontal displacement and accumulation maximum settlement of slope of Longmenhao Primary School do not surpass warning value thus knowing that slope of this section is basically stable which also provides references for stability detection analysis of engineering management.
Experimental Study on the Position of Balanced Point of Large-Tonnage Pile with Self-Balanced Load Method in the Northwest Region
Authors: Xin Ying , Yue Feng , Li Ping , Wang Gong Sheng
Published: July 2014

The self-balanced test technology has been widely applied in the eastern soft soil region for many years due to its economy and convenience. However, few engineering practices could be found in the northwest loess region. In this paper, self-balanced load tests were conducted in the large-tonnage piles of a bridge project in Gansu Province. The methods determining the position of pile balanced point were studied. The positions of balanced points of test piles were also simulated using Finite Element Method (FEM). The test results show that the self-balanced method has good applicability for loess in the northwest region. The pile side friction is fully exerted and the test data could be reasonable and reliable. Besides, the shortages of traditional empirical method could be made up for if FEM is adopted, which makes the accuracy of the balanced point position improve effectively and provide a reference for field trials.
The Stability of 3D-Geomat in Different Slope Gradient
Authors: Wang Guang Yue , Zhang Jian Peng , Sun Yuan Shuai
Published: July 2014

3D-geomat protective slope is a new type of protective slope form which combines the 3D-geocell with the planting grass. Because the complex and dense spatial structure can tie the slope soil and has a reinforced effect on the slope surface, it has the advantage in soil and water conservation and ecological protection, and it gets more and more widely used in the present engineering construction. By using the finite element model, we compare the whole stability in the 3D-geomat slope and unprotective slope under the condition of different slope gradient. And then we get the relative results.
Numerical Analysis of Floatation Response of Buried Pipeline in Liquefied Soil
Authors: Deng Su Nan , Peng Wen Tao , Lin Jun Qi
Published: July 2014

In this paper, the formulae are deduced for the floatation response of pipeline buried in liquefied soil. The beam model based on the theory of beam on elastic foundation is used for the pipeline buried in non-liquefied and liquefied soil. The soil property is nonlinear, the floating force induced by the soil liquefaction is related to the position of pipeline, is nonlinear also. For the convenience and simplification of analysis, the nonlinear increment element method was used and lots of numerical analysis was conducted, including: the floatation response of pipeline buried in homogeneous soil, the floatation response of pipeline buried in non-homogeneous soil, and the floatation response of pipeline buried in discontinuous liquefied area. The influential factors on the floatation response of buried pipeline buried in liquefied soil including spring stiff of liquefied soil, the initial deformation, the length of liquefied area, the axial force acting on the pipeline, the material of pipeline, and the diameter of pipeline. The calculation results of discontinuous liquefied area draw a significant conclusion that for a long liquefied area, to make the soil non-liquefied in the middle of liquefied area may decrease the length of liquefied area and reduce the flotation displacement of pipeline greatly.
On Stability and Deformation of Slurry-Trench Affected by Formation Equipment
Authors: Shi Mao Yin , Song Fu Gui
Published: July 2014

A synthesized investigation is conducted of trench formation machine’s effect on trench wall in soft soil area. The failure pattern of the slurry-trench is analyzed by means of 3D FEM based on strength reduction method. The investigation shows that the global instibility occurs in the superficial layers and speads along the trench segment. The grab movement in slurry has an instant impact on the trench wall and may cause local instability. The overload and construction technique of trench formation equipment are both important concerns during trench construction to ensure safetry.
Two-Dimensional Problem of Moisture Elasticity of Inhomogeneous Spherical Array with Cavity
Authors: Andreev Vladimir I. , Avershyev Anatoliy S.
Published: July 2014

The numerical-analytical solution of the axisymmetric problem of moisture-elasticity for hollow spherical soil massive is provided. We consider the steady-state water transfer. Inhomogeneity of the array due to the dependence of the deformation modulus on the soil moisture. Stress state of the array caused by forced deformations and uneven pressure rebuff of the soil. The method for solving non-axisymmetric problems with radial inhomogeneity in polar coordinates is described. Diagrams on the stress fields in homogeneous and inhomogeneous formulations of the problem are provided. It describes a method of calculating radial inhomogeneous axisymmetric problem of theory of elasticity for thick-walled spherical shell.
Development Features and Fractal Research of Fault Structure of No.5 Coal Seam in Chenghe-Second Coal Mine
Authors: Xue Xi Cheng , Wang Jia
Published: July 2014

Based on the collected geological exploration and underground mining data, this thesis has analyzed the development feature of faults of No.5 coal seam in Chenghe-Second coal mine and obtained fractal law of fault structure by fractal statistics. The result shows that the faults have a good self-similarity on the plane distribution and obvious fractal characteristics and that the larger the fractal dimension, the higher the complex degree of fault structures.
Sleeve Valve Pipe and Steel Pipe Micropile Fractured Tensile Reinforcement in Combination with the Application of a Mined-Out Area
Authors: Tang Sheng Li , Yang Liang , Sun Li Hai , Li Xiong Wei
Published: July 2014

Due to the early years of mining makes Gob fracture zone, the deformation of rock fracture zone, and gradually developed through. Located in the mined-out area causing tension within fractured zone of discontinuous deformation region arsenal varying degrees of ground and walls to crack, great security risk to the normal operation of the arsenal caused. Project uses Sleeve Valve Pipe and Steel Pipe Micropile reinforcement scheme. This paper describes the details of the reinforcement mechanism, the construction process, technical requirements and quality assurance measures. Practice has proved that the joint reinforcement program can continue to crack the wall of effective governance to ensure the safe operation of the security arsenal.
Evolution Characteristics of Permeability and Porosity of Mudding Weak Permeability Media with Nonlinear Flow
Authors: Deng Ying Er , Yu Jing , Peng Xin
Published: July 2014

Concepts of flow permeability, flow permeability coefficient and flow porosity were presented to investigate changes of permeability and porosity of mudding weak permeability media with nonlinear flow. Formulas of flow permeability, flow permeability coefficient and flow porosity were presented to study the evolution characteristics. Results show that permeability and porosity of mudding weak permeability media nonlinear flow increase with pressure gradient or hydraulic gradient of nonlinear flow, while permeability and porosity of high permeability media Darcy flow are constant. The results can provide a test and calculation of micro porosity with a new method and can provide engineering safety of mudding weak permeability media nonlinear flow with scientific basis.
Determination of Volumetric Joint Count Based on 3D Fracture Network and its Application in Engineering
Authors: Wu Jin Liang , He Ji
Published: July 2014

Volumetric joint countis an important parameter to evaluate the development of fractures. It is a fundamental representative for the strength and permeability of rock masses. However, cannot be directly measured in field. In this study, an indirect method is applied for its estimation. The main procedures are as follows: firstly, the volumetric joint frequencyis assumed for th fracture set, and then a series of 3D stochastic discrete fracture networks (DFNs) are generated using the Monte Carlo method according to; secondly, a survey line is drawn perpendicular to the fracture set in the each fracture network generated, the fracture spacing is measured along the survey line, then the average fracture spacing and its variance coefficient are calculated from all the DFNs; thirdly, by repeating the above two steps for differentassumed, the relevant average fracture spacing and its variance coefficient are obtained, and two relation curves are built up between and the average fracture spacing (or its variance coefficient); fourth, the exactis estimated through this relation curve between and the average fracture spacing according to the exact fracture spacing measured in situ; finally,is calculated by summing the exactof all fracture sets up. In this study, this indirect method is applied in the rock masses of Xiaowan Hydropower Station. The result shows that the fracture spacing will reduce and its variation coefficient becomes stable asincreases.
Relations between Paleoclimatological Conditions and Mineralogical Characteristics of Clays in Miocene Sediments at Linxia Basin, China
Authors: Yu Na , Hong Han Lie , Li Zhao Hui , Zhang Ke Xin , Li Rong Biao
Published: July 2014

Linxia basin is a late Cenozoic fault-block basin along the border between the Tibet plateau and the Loess plateau in Northwestern China. Its formation and sediments’ record may be directly affected by the structural dynamics and the uplift of the Tibet Plateau. For this reason, we studied the mineral characteristics of the Maogou formation of Miocene sediments using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The XRD results showed that quartz, chlorite, illite, calcite, plagioclase, orthoclase, kaolinite, and trace palygorskite are present throughout the sequence of the cross-section in Linxia basin. In contrast, gypsum and ankerite occur occasionally in the upper portion of the Miocene deposits. The content of calcite varied with layers in the profile and was relatively concentrated in mudstone. Chlorite and illite were observed transforming into palygorskite under SEM observation. Based on the mineral characteristics and the change of mineral composition, especially the clay minerals, it could be inferred that an arid environment prevailed in the region with warm and cold intervals during Miocene time.
Stability Analysis of Puzi Landslide in Chongqing
Authors: He Kai , Chen Chun Li
Published: July 2014

The boot-shaped landform is steep for upper part and gentle for lower part, which is suffering from serious landslide and collapse hazards, and the Puzi landslide studied in this paper is in boot-shaped landform. Stability analysis of Puzi landslide was taken on the detailed analysis of the tectonic setting, formation lithology and the meteorological hydrological conditions. The result demonstrates that the Puzi landslide is on the critical to unstable state. And it is possible to integral slide under the influence of rainstorm or continuous rainfall and has higher risk of geohazard. It is recommended that people settled in the landslide area should be relocated and early warning monitoring should be carried out immediately. The results will offer technical support to prevent and relieve of geohazard in mountainous areas of southwest China.
The Landslides Developed with the Evolution of the River Terraces in the Loess Plateau, China
Authors: Xing Xian Li , Hou Xiao Kun , Li Tong Lu , Li Ping
Published: July 2014

Landslide investigation in the center part of loess plateau reflects that most of large-scale old and ancient landslides lie on river terraces at different heights, but the small ones usually occur along the sides of V-shaped loess valleys, which implies that there is an inherent connection between the landslides and the erosion action. Since river terraces were formed by intermittent uplift of the crust, which controls the features of river erosion and the thickness of loess on the terraces. The analysis of typical loess landslides in this region shows that during relative static period, lateral erosion was dominated, so river valley was widened, which induced some large-scale landslides because the toe of slope was strongly eroded. While during the uplift period, vertical erosion was dominated, and the loess began to deposit on the terraces above water level, with the downcutting of the river, a narrow V-shaped valley formed, and then small loess landsides occurred on both sides of the rivers. Therefore, intermittent crustal uplifts not only led to the formation of multi-degree of terraces, but also induce alternative occurrence of large-scale and small loess landslides.
Researches on Slope Treatment Technologies under Complicated Geological Conditions in High Temperature and Rainy Regions
Authors: Shan Rong Xiang , Li Hai Ping
Published: July 2014

The appearance and development of deformation and loss of stability in the slope of cut is closely related with such interior causes as the qualities of layer rocks. Some external incentives like meteorological conditions, hydrology and process of construction are the main factors leading to the deformation of slope and its development. Three problems of deformation of slope, which is one of the common geographical hazards. The thesis, making an analysis of the geographical environment, the process of deformation and mechanism of destruction on slope of the right cut in Guangle Road K142+320~K142+740, reveals the key factors of deformation and damages of slope and proposes a reasonable realignment methods about slopes, which has achieved a good engineering effect and set a good example for the other similar slopes to be strengthened and improved.
Research on Two-Dimensional Landslide Model Control System Based on Support Vector Machine Modeling
Authors: Liu Zhong Tao , Feng Zheng Hua
Published: July 2014

Two-dimensional landslide model system is an important experimental platform for studying geological disaster, landslide behavior in different conditions are achieved by controlling the hydraulic pump drive model platform uplifting cabinet inclination. During the process of automation transformation of the two-dimensional landslide model system, control system based on computer is used to achieve a smooth lifting and precise angle of landslide model platform. Thanks to predictive control algorithm of least squares support vector machine (LS-SVM) model used in this paper, random real-time change of equivalent load applied on the hydraulic cylinder system effectively solved. The control system of the two-dimensional landslide model effectively eliminated crawling effect and pulse lifting in the condition of low speed and high load conditions of hydraulic system.
Research on the Mechanical and Thermophysical Properties of Frozen Soil in Cretaceous Formation
Authors: Dai Hua Dong , Yin Ming Lun , He Tian Yu , Liu Kang , Li Tie , Zheng Tie Qi
Published: July 2014

Through the test of artificial frozen soil of cretaceous formation soil sample, study the mechanical properties and thermophysical properties of cretaceous formation artificial frozen soil with different soil properties and subzero temperatures. Results indicate that, uniaxial compressive strength of artificial frozen soil of cretaceous formation soil sample linearly increases accompanied with drop in temperature, with identical soil properties and water content; with decreasing temperature, elastic modulus increases and Poisson’s ratio decreases, in the case of the identical soil and ambient temperature; with decreasing temperature specific heat of artificial frozen soil decreases and thermal conductivity increases.
Study on Control Technology of Slope in Mountainous Areas of Southwest China under Complex Geological Conditions
Authors: Yang Wei , Li Hai Ping
Published: July 2014

Deformation process of slope has been controlled by a variety of factors due to the unique geological, hydrological and meteorological conditions. And southwest mountain areas of China has been become high incidence areas of slope diseases during highway construction and operation. According to Wendu Road K55+590 ~ K55+670 left slope engineering geological environment, the deformation process and mechanism analysis, The key factor of the slope deforming destruction is proposed. the appropriate engineering treatments and the construction control measures are also proposed based on analysis.
Effect of Time-Varying on Shield Tunnel Lining Structure
Authors: Liu Feng Jun , Chen Jun Fang
Published: July 2014

In order to survey the time-varying effect on shield tunnel lining structure, rigidity reduce in the Homogeneous Ring Design Theory is introduced. There are three methods to evaluate the rigidity reduction caused by the aging effect. The first is the bending rigidity analysis method, which considers that the bending rigidity changes with the time-dependent stress and strain. The second is the method named the equivalent moment of inertia; the last is aging coefficient method. With the Homogeneous Ring Design Theory, the internal forces and displacement of the shield tunnel segment lining can be calculated. Based on the preliminary results, using the 1st method, the reduced rigidity and the long-time displacement at different instants of time can be calculated. It is found that the concrete shrinkage and creep effect can’t be ignored in the segment design. The survey is beneficial to monitor the deformation of tunnel lining, and the maintenance of the segments. It will make the tunnel work steadily and safely during the using period.
Estimating Distribution of Concrete Strength Using Quantile Regression Neural Networks
Authors: Yeh I Cheng
Published: July 2014

This paper is aimed at demonstrating the possibilities of adaptingQuantile Regression Neural Network (QRNN) to estimate the distribution ofcompressive strength of high performance concrete (HPC). The databasecontaining 1030 compressive strength data were used to evaluate QRNN. Each dataincludes the amounts of cement, blast furnace slag, fly ash, water,superplasticizer, coarse aggregate, fine aggregate (in kilograms per cubicmeter), the age, and the compressive strength. This study led to the followingconclusions: (1) The Quantile Regression Neural Networks can buildaccurate quantile models and estimate the distribution of compressive strengthof HPC. (2) The various distributions of prediction of compressive strength of HPCshow that the variance of the error is inconstant across observations, whichimply that the prediction is heteroscedastic. (3) The logarithmic normaldistribution may be more appropriate than normal distribution to fit thedistribution of compressive strength of HPC. Since engineers should not assumethat the variance of the error of prediction of compressive strength isconstant, the ability of estimating the distribution of compressive strength ofHPC is an important advantage of QRNN.
The Research of Green and Eco-Friendly Concrete’s Mixing and Application
Authors: Rui Yang
Published: July 2014

This paper mainly presents the study of preparation and application of green vegetation concrete, pervious concrete, and aquatic conservation concrete. The research includes material screening, mix proportion, operating points, construction process, and application scope. It has been observed that green and eco-friendly concrete can protect urban ecological system from departure of balance and contribute to realizing the sustainable development.
Discussion of Basic People’s Court Building
Authors: Gaowa Wu Jin , Tuo Ya , Ming Wen Hui
Published: July 2014

As one of the important state organs, basic people’s court is the symbol of national law, and it’s also a good place for public law education. In the context of the focus on both improving and construction the basic court, expound the key points in designing the basic people’s court and summarize the design methods of the courts from the aspects of the court’s size, functional division, circulation and architectural images, etc.
Fatigue Performance of Concrete with Pre-Cracks in Tension-Compression Cycles
Authors: Shen Jian , Liu Xiao Yun , Wu Lang
Published: July 2014

A tension-compression cycle fatigue test was performed in order to study the fatigue property of C50 concrete with pre-cracks in cyclic loading. The stress ratio was-1 and the amplitude was 0.2 MPa ~1.30 MPa. The results show that the modified coefficient of fatigue strength is 0.198~0.265 and the infinite life fatigue strength is below 0.45MPa. While the log value of fatigue life is approximately linear with the amplitude of fatigue load stress, the discreteness of fatigue life, the particularity of concrete, has little to do with the amplitude. The S-N, P-N fatigue life curves and the constant fatigue life diagram of pre-crack concrete are obtained.