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A Case History of the Pile-Supported Raft Design Optimization LI Qiannan1, ZHANG Li2 null    2015, 29 (4): 130-134.   Abstract （1009）            Knowledge map    This paper presents a case history of the basement improvement design for a High-Raised Building: International Trade Center in Wuhan. The owner, Wuhan Hanpeng Real Estate Development Co., contacted the Soils and Foundations Committee of Hubei Society of Civil Engineers in 1993. The targeted tasks were: 1) Reduce the thickness of the foundation slab; 2) Raise the bottom of foundation slab elevation; and 3) optimize the other structural elements in the basement design to facilitate the safety, to reduce the cost and for the ease of the construction. The Soils and Foundations Committee fulfilled the requirement of the owner.  Related Articles | Metrics

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Shanghang Zijinshan Landslide Mitigation Design SUN Wenchao, FAN Xiufeng, HUANG Zhen null    2012, 26 (6): 15-17.   Abstract （2582）            Knowledge map    This paper presents the case history of the mitigation design of Shanghang Zijinshan landslide. The geotechnical as well as the environmental conditions of the distressed slope are reviewed. The stability of the slope is also analyzed. The proposed mitigation design protects the safety of buildings at the toe of the slope and is also proved to be a cost effective improvement method. Related Articles | Metrics

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Stability of High Open Pit Rock Slopes under Blast Loading ZHANG Deng1, 2, JIAN Wenbin1, 2 null    2014, 28 (2): 133-137.   Abstract （1760）            Knowledge map    Instabilities are prone to be induced under the blast loading for the high rock cut slopes in open pit mines. An improved method, which considering the frequency effect of the seismic inertia, is used in the time history analysis of the rock slope stability under the blast load. Combined with kinematical method, limit equilibrium method and numerical method, a comprehensive evaluation method for the cut slope stability was proposed. The improved method was applied to evaluate a rock slope of a tungsten mine. The results show that the higher the vibration frequency is, the more the safety factor decreases. But the higher the vibration frequency is, the faster the dynamic response attenuates and the extent of the safety factor reduction is limited. The time history curve of the safety factor of planar and wedge failure calculated by limit equilibrium method fluctuates around the static safety factor. The minimum value of the safety factor is 1.3, which is in accordance with the results of the FEM method. All of these indicate that the general failure of the slope is unlikely, but toppling or rockfall failure of small scale is probable. Related Articles | Metrics

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Effect of Moisture Content on the Shear Strength and the Creep Properties of Jingyang Q2 Loess LI Kai Soil Engineering and Foundation    2020, 34 (3): 339-341.   Abstract （367）            Knowledge map    The issue of loess intensity has always been a hot topic in the study of geotechnical scholars. The shear strength and loess creep caused by the change of water content are closely related to the stability of loess slope. Through direct shear and creep tests, the effects of water content, dry density and normal pressure on shear strength,and long-term strength of unsaturated Q2 loess are studied. The results show that compared with the strength of loess with 10% and 18% moisture content under different dry densities, 18% shear strength weakens more than 20% compared with 10%；The increase of water content also has a weakening effect on the viscous force, and there is a more serious tendency to weaken with the increase of dry density；The creep will be caused by the decrease of water content and the increase of dry density； By fitting, it is found that the creep of loess conforms to the law of logarithmic function curve. Related Articles | Metrics

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Physical Properties of Fly-ash and Blast Furnace Slag Mixtures in the Soil Improvement LIU Xiang, WU Chenglong, XU Youjun, GUO Peng null    2015, 29 (6): 20-24.   Abstract （1350）            Knowledge map    The blast furnace slag and flyash mixtures were used as the foundation fill. The grain size analysis on the mixtures indicates that the fill material is poor graded with the absence of finer grain material. The foundation fill was treated with dynamic compaction as well as the conventional compaction by a vibratory roller. After the treatment, the gradation of the fill materials have significantly improved to the well graded gravel materials. The maximum dry density, optimum moisture and the degree of compaction were obtained by the heavy dynamic penetrometer testing. The average specific gravity of the mixture was obtained from the specific gravity tests on both materials. The code used average specific gravity formula for the mixtures was corrected for the finer grain sized materials. Related Articles | Metrics

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The Application of Deep Mixing Method in Red Clay Soils JIANG Jinming null    2015, 29 (5): 4-6.   Abstract （1281）            Knowledge map    Red clay is a widely distributed soil in Southern China. With the economic development in recent years, the demand for the bearing capacities for buildings with increasing height exceeds the capacity limit of the natural red clays. This paper presents a method that improving the bearing capacity of the red clay soil by using cement mixing. The design and construction aspects of the soil mixing in red clay are also introduced. The quality control measures during the construction are also proposed. Related Articles | Metrics

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Application of Borehole Imaging Technology in the Determining the Thickness of Drilling Debris SUN Yugang, BAO Fubo, LV Yingming, ZHENG Yong, Soil Engineering and Foundation    2020, 34 (3): 366-368.   Abstract （518）            Knowledge map    A new method for the determining the thickness of drilling debris at the bottom of the cast-in-place reinforced concrete pile boreholes is proposed combined with testing practice in this paper. Based on the borehole drilling inspection, this device can visually reproduce the interface conditions of the “pile-end concrete-drilling debris layer of rock or soil” at the bottom of the borehole by using borehole imaging technology. Thus, image analysis technique can be applied to accurately measure the drilling debris thickness at the bottom of the drilled pile. Through expanding the cylindrical imaging of the borehole to a panoramic plane, the operator can directly measure the drilling debris thickness under the side wall corresponding to various azimuth angles. “N equal-point average” and “integral average” algorithms are recommended to achieve the representative drilling debris thicknessat pile bottom, which can be used to evaluate whether it meets the design requirement.According to on-site tests of 10 large-diameter rock-socketed cast-in-place piles form different projects, the drilling debris thicknessobtained by this new method is proved to have the advantages ofaccurate,reliable and simple operated. Related Articles | Metrics

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Correlations between SPT and Heavy Dynamic Penetration Testing in Silty Fine Sands LIU Xu, ZHANG Haidong, GE Baoyu, LI Hongpeng, CHI Jiayuan null    2014, 28 (6): 126-128.   Abstract （2127）            Knowledge map    In a conventional geotechnical investigation, the standard penetration test (SPT) is often utilized when a silty fine sand layer is encountered and the heavy dynamic penetration test (HDPT) is rarely used in the practice. The HDPT is often influenced by the operator's experience and factor factors and leads to a large testing error of these tested data. The tested data are then need to be carefully evaluated before they are used for the design purposes. Based on the test data obtained for the updating of Liaoning provincial code: Technical Code for Building Foundations and Soils, both SPT and HDPT data in the silty fine sand layers are compared and analyzed. The bearing capacity values determined by both methods are also compared. The correlations between SPT and HDPT are established for the design purposes. Related Articles | Metrics

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Stability Evaluation and Design of a High Cut Slope for the Wuhu Nuclear Power Station NIE Wen bo1， LUO Jian yu2，YE Jing feng1， SHAO Dong feng1 null    2011, 25 (5): 57-59.   Abstract （2995）            Knowledge map    Geotechnical conditions of the East Slope in the Wuhu nuclear power station are analyzed in detail based on the topographical， physiognomic，lithology，geological structure，groundwater and potential unfavorable geologic conditions. The stability of this high cut slope is evaluated qualitatively and quantitatively by various methods such as engineering geology evaluation, stereographic projection analysis，and limit equilibrium analysis.  The slope excavation design is optimized from these extensive analyses. Related Articles | Metrics

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Time-Dependent Effect of Bearing Performance in Driven Pile LI Yong null    2011, 25 (3): 30-.   Abstract （2900）            Knowledge map    Time-dependent effect of bearing capacity of driven pile in saturated soft soil has been known in the engineering practice effectively. Combined with in situ load test results, the mechanism of time-dependent effect on bearing capacity of driven pile in saturated soft soil is analyzed． The results showed that the structure strength of the disturbed soil around the pile is regained with the time increasing and the lateral friction of pile is also increased, which shows time-dependent effect. Related Articles | Metrics

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Overhead Power Line Vibration Monitoring and Analysis CHEN Song null    2015, 29 (1): 117-119.   Abstract （1450）            Knowledge map    The effect of the high speed train induced vibrations on the adjacent structures becomes more prominent with the rapid development of the high speed rail in recent years. The vibration within the soil mass would likely affect the normal use of the land along the railway alignments. The key to resolve the vibration related problem is to accurately measure the vibration. Based on the characteristics of the passenger rail lines, the dynamic response sensors were reasonably arranged in order to measure the response of the high speed train induced vibrations at various locations. The vibration response spectrum was obtained throughout the Fourier Transformation. The vibration dissipation characters can be more explicitly observed from the response spectrum. The objectives of the vibration study are: 1) provide basic data for the high speed rail vibration mitigation measures; 2) provide reference data for the high speed rail design. Related Articles | Metrics

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Stability Analysis of a Manmade Mining Slope NING Guoli, WANG Xiaotao, CHEN Guoyou null    2012, 26 (6): 38-41.   Abstract （1872）            Knowledge map    A manmade high slope at the edge of a floatation ore processing plant was formed by the mining excavation. The slope was identified having accelerated deformations and having safety hazard to the mining operation. This paper studied the impact of subsurface soil condition and precipitation on the slope stability. The mitigation measures are proposed based on the stability analyses. Related Articles | Metrics

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Experimental Investigation on Interface Characteristics Between Pre-Strained Geogrid and Sand Cushion HUA Chao1, YAO Wenmei2 null    2019, 33 (5): 613-617.   Abstract （335）            Knowledge map    The interface characteristics between prestrained geogrid and sand cushion were studied through a serious of pullout tests. The experimental program was divided into two parts, the influence factors, such as, normal stresses, cushion thickness and initial strain, on the interface characteristics of prestrained reinforcement were investigated by comparing the results of the comparative analysis. Under the low normal stress condition, the results showed that the prestrained geogrid and the conventional geogrid have little differences on the peak value of tension resistance when the thickness of sand cushion is 5 cm. The tensile stress of the prestrained geogrid is much higher than that of the conventional geogrid and the strain softening phenomenon is becoming obvious with the increase of the normal stress. When the normal stress is 50 kPa, the increase of the thickness of the sand cushion has an improvement to the tension resistance. When the thickness reaches 15cm, the effect is obviously reduced, and the strain softening will occur on the geogrid with a high prestrain level. Finally, the envelope of the shear strength of the interface is obtained by fitting the experimental data. It is concluded that the prestrained reinforcement can significantly increase the coefficient of quasi friction between the geogrid and the sand cushion and reduce the quasi interface cohesive force at the same time and provides theoretical basis for the popularization of prestrained reinforcement method. Related Articles | Metrics

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River Crossing Shielded Tunnel Remediation Techniques for Wuhan Metro No. 4 Line XU Yanzhao null    2016, 30 (1): 28-31.   Abstract （1485）            Knowledge map    In the crossriver project along Wuhan Metro Line 4, when the shield got through the portal, water burst and sand boil took place, damaging greatly lining segments. And they must be repaired ahead of usage. This paper will introduce relevant repairing methods to remediate the damaging situation. The paper can also provide some experience and reference for similar segment repair.    Related Articles | Metrics

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Comparative In-Situ Study of Soft Soil in Dongting Lake#br# ZHANG Peng, MA Deqing, WU Yuanming Soil Engineering and Foundation    2020, 34 (3): 376-379.   Abstract （416）            Knowledge map    In situ test methods have advantages in testing different soil parameters of soft soils. The accuracy and effectiveness of these in-situ testing methods are related to their structural characteristics; geological conditions, and testing experience of the operator. In Dongting Lake soft soil area, the insitu testing methods are very important tools for the soil property characterization, and it is also equally important to select the appropriate testing device for the certain soil parameter. This paper presents the comparative study results of wo soft soil with different deposition origin using different insitu testing devices. The results indicate that, the cone penetration test (CPT) results are repetitive and more accurate. Diverse results are obtained in using vane shear testing device; the empirical formula for flat dilatometer in Dongting soft soil has scattered results and are not reliable. It is concluded that the CPT should be mainly used for the soft soil characterization and compensated by vane shear device. Plat dilatometer should be used for the purpose of experience accumulation. Related Articles | Metrics

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Gravity Retaining Wall with PreStressed Ground Anchors Stabilizing a River Slope XIAO Rongjun null    2015, 29 (2): 29-32.   Abstract （1440）            Knowledge map    The existing retaining wall for the river bank slope along the north side of the East Jiangpu Road in Xijiao Township, Foshan City is a castinplace reinforced concrete wall. The design of the new retaining wall considers the characteristics of the existing wall, subsurface geotechnical and hydrological conditions, the adjacent environments and the previous successful experience in the design and construction of the prestressed ground anchors in the area. During the construction, the horizontal movements of soils behind the retaining wall were monitored and the results verified feasibility of the design method. Related Articles | Metrics

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Stability Analysis and Mitigation Solutions of a Landslide at Shiqian Springs Road in Guizhou MA Ning， ZHAO Yejiang null    2014, 28 (5): 16-19.   Abstract （1615）            Knowledge map    The case history of a landslide at Shiqian Springs Road in Guizhou is presented in this paper. The site environmental geology conditions, geotechnical information of the subsurface conditions are analyzed based on the site specific investigation dada. The stability analyses along different soil strata are performed by using block failure method. The factor of safety of the site is obtained as a result of the analysis and the mitigation measures are proposed. The investigation results indicate: The slope is located on a daylight site. During the long construction period and under prolonged heavy precipitation, the unit weight of the surficial soil is increased and the shear strength of the sliding surface is also reduced, therefore, the geological hazards, such as landslide, might be triggered. Related Articles | Metrics

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The Application of the Soil Nail Reinforced Slope and the Anchored Pile Structure in a Complex Deep Excavation ZHOU Peifeng1,ZHANG Yundong2 null    2012, 26 (5): 1-3.   Abstract （3446）            Knowledge map    A combination of soil nailed upper slope and anchored pile wall for the lower wall was applied to the foundation pit excavation. The proportion of upper slope and lower wall was optimized by global stability and external stability analyses.  During construction, with strict QA/QC, detailed plan for emergency response and close field instrumentation, the monitored movement of the slope and the wall was kept below target value. Related Articles | Metrics

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Remediation Design of Landslides near the City Expressway LIU Dong1,2 null    2015, 29 (4): 40-43.   Abstract （1440）            Knowledge map    Landslides on the slopes at both sides of the city expressway might have a significant impact on the safe operation of the roadway. It is therefore urgent to provide protective measures for areas that have landslide hazard potentials and provide mitigation measures for areas that have slides occurred. This paper provides a case history of landslides at a city expressway in South China. The characteristics of the landslide projects are introduced and the key aspects of the mitigations are proposed. The landslide process was simulated with the finite element method. The numerical analysis indicates that the landslide mitigation method is effective and the safety hazard to the roadway has been eliminated. Related Articles | Metrics

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Deformation Monitoring and Back Analysis of Soil Parameters in the Cut and Cover Installation of Taihu Tunnel GAO Defeng, ZHOU Ao, FENG Yateng, WANG Haixiao, XIA Wenjun Soil Engineering and Foundation    2020, 34 (3): 385-390.   Abstract （423）            Knowledge map    It is of great significance to obtain appropriate soil parameters for efficient engineering design and safe construction in soft soils. However, different degrees of disturbance are inevitably induced in the soft soil samples in the sampling and test process due to the soft soil properties so that the accuracy of soil properties is affected. The back analysis of soil parameters from a large amount of construction monitoring data can effectively optimize and compensate the soil parameters obtained from the laboratory and in-situ testing. This paper presents the back-analysis results of soft soil parameters from the construction monitoring of a cut and cover tunnel in Taihu Lake by using the BP neurol network analysis method. The results indicates that, based on the back analysis obtained soil parameters, the deformation of the supporting structure could be accurately simulated and consistent with the monitored data. Related Articles | Metrics