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Correlation Analysis of SPTN Values and Cohesion and International Angle of a Clay CHENG Jianguo null    2012, 26 (4): 91-93.   Abstract （13149）            Knowledge map    This paper presents the correlation analysis between Standard Penetration Test (SPT), blow count (N) value, and shear strength parameters of residual cohesive soils from Huanggang Eroded Ridge formations. The data used in the analyses are from the geotechnical exploration of nine (9) projects. A empirical relationship between the SPTN value and the strength parameters, cohesion c and internal friction angle,  φ, are obtained through the regression analysis of 99 N values and 102 tested samples. Related Articles | Metrics

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Application of SoilColumn Area Replacement Ratio in the Composite Grounds ZHANG Xiaoli null    2012, 26 (3): 81-83.   Abstract （12783）            Knowledge map    "Soil Improvements Specifications for Building Foundations" recommends formulas for the soilcolumn area replacement ratio, but these formulas are only valid for columns with triangular, square, or rectangular distributions. When the column distribution does belong one of the above distributions, the area replacement ratio cannot be calculated from the code recommended formulas. It is understood that the replacement ratio is ratio of cross section of the column and the area of the tributary. The area replacement ratio can be obtained from the graphical solutions. Related Articles | Metrics

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Unconfined Compressive Strength of Shanghai Cohesive Soils Reinforced with Palm and Wheat Straws QU Jili，LIU Baoshi, LI Chencai null    2013, 27 (6): 98-103.   Abstract （8549）            Knowledge map    In order to improve the strengthdeformation characteristics of Shanghai soft cohesive soils, the palm and wheat straws are added in the target soil samples, respectively. The unconfined compressive strength of the soils reinforced with palm or with wheat straw is analyzed by selecting different reinforcement lengths and reinforcement ratios as influence factors. The results show that: 1) Unconfined compressive strength of the palm reinforced soils is higher than that of the wheat straw reinforced soils. Both of the reinforced soils have the higher strength than the original soil samples. 2) The optimum reinforcement length of the palm straw is approximately 15 mm and the optimum reinforcement ratio is about 1.0 % in weight; The optimum reinforcement length of tubercular wheat straw is approximately 15 mm and the optimum reinforcement ratio is about 0.3%~0.4% in weight. 3) The stressstrain curves of the palm reinforced soils tend to be strainhardening type. The stressstrain curve of the wheat straw reinforced soils appear to be strainsoftening type. The preliminary results show that the palm and wheat straws are both suitable for being used as reinforcement materials. The reinforcement effect of palm straws has a better result comparing with soils reinforced by the wheat straws. Related Articles | Metrics

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Embedded depth Calculation of Retaining Structure FU Zhi feng1， WU Xiao yun1, LIU Fang1, LI Jie2 null    2011, 25 (2): 72-.   Abstract （8472）            Knowledge map    The embedded depth of retaining structure of pit satisfies not only the anti-heaving stability of pit bottom but also anti-overturning stability of retaining structure. Based on codes, the calculating difference of embedded depth was analyzed with the some methods including elastic method, arc-slippage method, arc-slippage method considered the horizontal brace force and empirical law of the code. Then the acceptable range of embedded depth was proposed considered the discreteness of soil mechanical property. Related Articles | Metrics

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Sliding Factor of Safety Calculations under Various Special Conditions WANG Linyong1, LIU Fuchen2, LIU Minnan3 null    2016, 30 (1): 69-72.   Abstract （5376）            Knowledge map    The different sliding factory of safety in the retaining wall design under various loading conditions are presented in this paper. These conditions are: reverse slope at the bottom of a retaining wall; segmental lined slope failure mode; and circular failure mode. The factor of safety calculation formulas are proposed. The case history calculation these methods are reasonable. Related Articles | Metrics

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Discussions on the Pile Axial Capacity Estimation Formulas ZHANG Xiaoyu1， SHANG Jifa2 null    2013, 27 (1): 41-42.   Abstract （4973）            Knowledge map    The load transfer mechanism in an axial loaded pile is studied through the static loading tests on instrumented piles. In the allowable axial capacity estimation formula, the allowable capacity is obtained by using the limiting values of shaft and tip resistance divided by an uniform factor of safety of 2. This approach is not consistent with the actual load transfer mechanism. The ideal pile allowable capacity should be obtained by the limiting values divided by different safety factors. However, at current stage, it is appropriate to use one comprehensive safety factor to obtain the allowable pile capacity since the load transfer mechanism between the pile shaft and the tip are not clear. Related Articles | Metrics

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Construction Method for Lifting Rebar Cage for Diaphragm Wall ZHU Yongwei1，2 null    2012, 26 (2): 28-30.   Abstract （4369）            Knowledge map    The construction method for lifting rebar cage for diaphragm wall for a metro station is presented in as case study.  The selection of crane, lifting capacity estimation, the locations of pick points and proper construction procedure are presented in this paper. Related Articles | Metrics

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Analysis of the plate loading test on the foundation which replacement by rubble YANG Lei null    2013, 27 (2): 141-142.   Abstract （4299）            Knowledge map    The plate load test is an insitu testing method that is to determine the bearing capacity and the deformation moduli within the influence zone of the testing plate. This method has the advantage of simple to apply and is also reliable. This paper presents a case history of applying the plate load testing in the soil replacement with gravel for a retaining wall construction in the near shore roadway project. Related Articles | Metrics

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The Statistical Analysis of Soil Test Report with Excel VBA LIU Da hai null    2011, 25 (4): 69-72.   Abstract （4201）            Knowledge map    The stratified statistics of soil test indicators is the basis of data analysis in geotechnical engineering investigation, which is the main basis for providing geotechnical parameters such as bearing capacity of foundation and pile, ground deformation analysis and foundation pit supporting. Based on Excel soil test report and Excel VBA, template of statistical analysis is prepared and statistical processing of stratified data is realized. Its Excel table can be used directly as the project document of a survey report. Related Articles | Metrics

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Theory and Application of Ultrasonic Testing with Single Transmitter and Dual Receivers in Single Hole YUAN Bo1, HE Hao hui2, YAO Li ming3 null    2011, 25 (4): 73-74.   Abstract （4083）            Knowledge map    The ultrasonic testing is one of the elastic wave tests, its theory is from the theory of elastic wave propagation in solid media. In this method, the ultrasonic wave is from the artificial excitation vibration source to some certain media, such as rock, rock mass and concrete, etc., and the wave modulated by their physical characteristic is received in some distance, then acoustic parameters of wave such as velocity, amplitude, frequency, etc. are observed and analyzed. By this way, some problems in geo-engineering are solved. Related Articles | Metrics

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Simulation of Triaxial Tests of Marble Samples through the Particle Flow Code YAO Tao1， REN Wei2，QUE Kunsheng3， WANG Yundong4 null    2012, 26 (2): 70-73.   Abstract （4069）            Knowledge map    The paper simulates triaxial tests of marble under different confining pressures by the particle flow code (PFC). It is noted that the micro parameters derived from the uniaxial tests can be used to simulate triaxial tests. The comparisons between the results of PFC numerical simulations and laboratory test show good agreement with the tested Mohr-Coulomb strength parameters. However, the PFC simulations could not reflect the change of the elastic modulus in the actual testing. The significant differences also exist in the tested and simulated Poisson's Ratio values. Related Articles | Metrics

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Stability Analysis for the Slope Excavation for a Ship Lift of the Goupitan Hydropower Plant LI Yafeng1, GUO Zhihua2，XU Haiyang2，LEN Xianlun3 null    2012, 26 (5): 75-77.   Abstract （3945）            Knowledge map    Based on the field geological exploration and the laboratory tests, a finite element analysis for the excavation stability was conducted on the ship lift slope of Goupitan Hydropower Plant. The deformation, the maximum principal stress distribution, and the failure zones of three different excavation schemes were studied. It is found that the deformation, the zones of tensile stress and zones of potential failure can be effectively reduced by the proposed rock anchors. The stability of the ship lift slope can be assured throughout the detailed analyses. Related Articles | Metrics

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Evaluation and Settlement Analysis of Collapsible Loess Soils Improved by Dynamic Compaction YA Ruwen null    2017, 31 (6): 685-689.   Abstract （3835）            Knowledge map    This paper presents the geotechnical engineering investigation and evaluation results of a collapsible loess project site in the east Ningxia before and after the soil improvement by the dynamic compaction. The investigation methods included laboratory soil tests, standard penetration tests, Becker penetration tests as well as insitu plate loading tests before and after the soil improvement. The settlement of the site was also evaluated. The following results can be obtained: 1)the unit weight of the loess soils was significantly increased. The compressibility of the loess soil was low and the collapsible potential of the surficial loess soils were reasonably eliminated. The bearing capacity of the improved loess soils reached the design requirements. The dynamic compaction was suitable for improving the east Ningxia loess soils. 2)for sites that were backfilled with collapsible loess soils, a layer of cushion material is necessary at the bottom of the foundation so that the minor settlement induced by the surface water infiltration could be avoided. Gravel is the desired cushion material. 3)The consolidation induced by the backfill material and soaking of the collapsible loess filling material could also induce settlement in loess soils. Related Articles | Metrics

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Layout of Well Points in Deep Excavations and the Stability of Supporting Structures FU Zhi feng1， ZHOU Wei1，LI Jie2， XIONG Chao hui3 null    2011, 25 (5): 48-52.   Abstract （3776）            Knowledge map    Well points are often used to control groundwater and enhance stability of deep excavations in areas of shallow groundwater. The distribution of these well points not only impacts the effectiveness of the de\|watering, but also influences the performance of the supporting structures and adjacent environments. From a case history, three different well point arrangements are evaluated with numerical analyses. These well point arrangements are: single row inside the excavated area; double rows inside the excavated area and symmetric double rows outside the excavated area. The numerical approaches study the efficiency of dewatering, the performance of the supporting structure surrounding the excavated areas and the impact on the adjacent environments for each well point arrangement. Better design parameters for layout of the well points for the deep excavations are suggested in this paper. Related Articles | Metrics

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Design, Calculation and Monitoring of Deep Foundation Pit with Pile-Anchor Retaining Structure Zhang Hong bin, An Guan feng, Liu Tian jun null    2011, 25 (3): 5-8.   Abstract （3732）            Knowledge map    The deep foundation pit was located in the CBD region in Zhujiang Newtown in Guangzhou, which had the following characteristics, the high excavation depth, the poor property of soil and the complex around environment. The general situation and design of this deep foundation pit was introduced, which included two support structures: the manual hole digging pile and prestressed anchor retaining structure and the manual hole digging pile and concrete internal bracing support structure, and the Finite element method analysis was used to calculate the effect of manual hole digging pile and prestressed anchor retaining structure. The rationality and reliability of design was verified by the comparison between FEM analysis data and monitoring data. Related Articles | Metrics

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Discussion on the Pile Axial Capacity Prediction through Curve Fitting of Measured High Strain Data HE Shanbing null    2013, 27 (1): 59-62.   Abstract （3716）            Knowledge map    This paper presents three case histories of pile axial capacity predictions through the curve fitting on the measured high strain data. The procedure of the regression of the curve fitting is also summarized. Reasons for the large deviation from the observed data, and methods to improve the prediction are recommended in the paper. Related Articles | Metrics

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Comparison of Soil Dielectric Constant-Water Content Models LIU Hua gui， ZENG Jian null    2011, 25 (2): 58-.   Abstract （3685）            Knowledge map    The Time Domain Reflectometry(TDR) used to estimate soil water content was based on the relationship of soil dielectric constant\|water content. Errors of Topp model, Mixing model and Diffusion model were analyzed with test results. Test results show that parameters of Mixing model and Diffusion model are too randomly to be determined, but parameters of Topp model with neglecting the forms of soil component can be used in engineering with proper revising in despite of the error in the model. Related Articles | Metrics

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Study on Natural Ventilation Effects on the Z-Shaped Urban Pedestrian Underpass GUAN Xiangyang1,2, WANG Yong 2, LI Xiongwei3, LI Mingzhong4 null    2017, 31 (1): 42-44.   Abstract （3684）            Knowledge map    The urban underground facilities in the humid and rainy climatic conditions in southern China often results in the serious condensation hazards. In order to reduce the maintenance costs after the completion of these underground structures, the natural ventilation should be encouraged in the urban pedestrian underpass as much as possible. The layout of the underpass has a strong influence on its ventilation effect and the minimization of the condensation hazards. This paper presents the underpass project of Cuiliu Street in Wuhan. The insitu ventilation tests were conducted and the numerical analyses were performed to verify the effect of the natural ventilation. The results indicate that the numerical analysis results are close to the measured results from the insitu tests. The insitu tests and the numerical analysis results verified that the natural ventilation is a better way of minimize the condensation hazard. Related Articles | Metrics

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Supporting Structures for a Large Deep Excavation in Soft Soils MA Yun1，2， XU Guang li1 null    2011, 25 (6): 26-.   Abstract （3682）            Knowledge map    The normal water table level in the Yangtze River near Jingzhou City is above the ground surface inside the Jingjiang Embankment. A deep excavation site in the center of Jingzhou City is only 700 m from the embankment along the Yangtze River. Due to its proposed eight meters of excavation depth, this site is classified as Level I on the Importance Class Scale (most important). This site is characterized by underlying saturated soft soil strata, high artesian water head and adjacent structures that are sensitive to construction disturbance. Therefore, stringent requirements are placed on deep excavation design and construction. Using theoretical analysis and empirical judgments, different supporting structures are selected based on the characteristics of soil strata and the geometry of the excavations at the various locations. Supporting structures include cast\|in\|place piles, rigid frame piles and arch\|supporting piles. These supporting structures are not only for the excavation construction easement but also for minimizing settlement and differential settlement problems surrounding the structures. Related Articles | Metrics

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Equivalent Nonlinear Visco\|elastic Model of Soils based on MSC.Marc Redevelopment GUAN Tian ding, CUI Jie, LI Ya dong null    2011, 25 (6): 57-.   Abstract （3631）            Knowledge map    An equivalent nonlinear visco\|elastic constitutive model of soils is developed by the use of secondary development programming interface function, USER SUB.HYPELA, on the MSC.Marc software platform. A typical soft soil site in Guangzhou is selected for the study. The site specific seismic spectrum is analyzed by a two\|dimensional finite element analysis (FEA). To verify the accuracy and reliability of the suggested constitutive model, the result compares well with the results from SHAKE 91, the widely accepted software for the seismic reaction of overlying soils. Related Articles | Metrics