Most Down Articles

Published in last 1 year | In last 2 years| In last 3 years| All| Most Downloaded in Recent Month| Most Downloaded in Recent Year|

Most Downloaded in Recent Month

Please wait a minute...


For Selected: Download Citations EndNote Reference Manager ProCite BibTeX RefWorks Toggle Thumbnails

Select

Study of Optimized Mixing Ratio of High Pressure Prefabricated Cement-Soil Columns GUO Yukui1， CHEN Dafen2， DAI Ye3， FENG Lei2 null    2018, 32 (1): 106-110.   Abstract （1114）            Knowledge map    The development of a new prefabricated high pressure formed cement mixing soil column equipment is introduced in this paper. Under a pressure of 25 MPa, the relationship between the cement ratios and the compressive strength of prefabricated cementsoil columns are investigated. The cementsoil block samples with different mixing ratios and the unconfined compressive strength correlations are obtained throughout the regression analysis. The amount of cement, lime and water in the prefabricated high pressure formed cementsoil columns are optimized and the appropriate cementwater ratio range is between 0.4 and 0.7. Related Articles | Metrics

Select

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

Select

Supporting Methods Comparison for a Deep Excavation Project in Wuhan YAN Wenping null    2017, 31 (2): 157-160.   Abstract （1230）            Knowledge map    The general guide lines for the deep excavation supporting project design should be safe, serve for the purposes, environmental friendly, apply the appropriate construction method, and more importantly, be cost effective. Based on the adjacent constraint and site geotechnical and hydrological conditions, this paper discusses the advantages and disadvantages of the three different excavation supporting methods, namely, secant piles; reuseable prestressed ground anchor with secant pile; and reinforced concrete internal support. It is concluded that the prestressed ground anchor with secant pile method is better over other two methods since it creates larger construction space so that the construction schedule could be met and it is also more cost effective than other methods. Related Articles | Metrics

Select

Technical Aspects of Non-Recyclable Ground Anchor Cable Removal GENG Xiewei Soil Engineering and Foundation    2020, 34 (1): 1-03.   Abstract （1338）            Knowledge map    Non-retrievable ground anchor cables are conventional cables, and the tension parts are mainly made of steel strands. After the construction of nonrecyclable anchor cables, it will have some negative impacts on the surrounding underground environments. These impacts mainly include: (1) the impact on the construction of the pile foundation in adjacent blocks; (2) the impact on the deep excavationactivities in adjacent areas; (3) the impact on the surrounding municipal construction; (4) the impact on the excavation construction of subway shielded boring machine; (5) the impact on the longterm planning of the city. There are some difficulties in the removal methods and techniques of nonrecyclable anchor cables, and few successful cases were reported. This paper demonstrates the method and the technical aspects of the nonrecyclable anchor cable demolition based on the analysis of an actual demolition project. Related Articles | Metrics

Select

Application of Dynamic Cone Penetrometer  Tests in Gravelly Soils in Deyang Area CHENG Xiaowei null    2012, 26 (2): 99-1000.   Abstract （2672）            Knowledge map    Due to the complexity of the subsurface conditions in different areas and the factors that might potentially affect the blow counts in the Dynamic Cone Penetration Tests (DCPTs), it is proved that the correlation between blow counts obtained by different hammer weights, N120 and N63.5, are not unique. Soils in different areas might have different relationship. This paper discusses the relations between N120 and N63.5 in the sandy, gravelly and cobble soils in Deyang area. Related Articles | Metrics

Select

Quantitative Evaluation of Uniformity of SoilCement Mixing Columns CHEN Dingan null    2012, 26 (4): 102-105.   Abstract （3272）            Knowledge map    This paper introduces a method of quantitative evaluation of the uniformity of soilcement mixing columns. Related Articles | Metrics

Select

Geological Hazards and Mitigation Methods in Highway Reconstruction after Wenchuan Earthquake JIANG Xian null    2012, 26 (6): 65-69.   Abstract （1855）            Knowledge map    A large earthquake measured Ms=8.0 occurred on May 12, 2008 in Wenchuan County, Sichuan province. The earthquake caused a huge loss of lives and properties. At the same time, the earthquake casted numerous geological hazards such as landslides, sudden subsidence, falling rocks, unstable rock masses and debris flows. These geological hazards distributed along the main earthquake fault zones, main rivers, and valleys. Their features can be characterized as large quantity, high density and complicated types. The basic types of geological hazards are described in this paper. The main features of each were analyzed. It is concluded that, the geological hazards are still a high incidence in the last 3 to 5 years under the impact of rainfall and other adverse conditions. It will gradually become a relatedly low frequency 10 years later. The evolution trend of debris flow is that its activity intensity becomes from rapidly increase to progressively dormant. The active periods and dormant periods of debris flow alternate. The basic principles of postearthquake highway alignment selection are proposed in the paper. Some mitigation methods are also proposed for each geological hazard. Related Articles | Metrics

Select

Analysis of the Stability and Dynamic Properties of Tailings Slopesunder HighSpeed Train Vibrations XU Xutang1,2， JIAN Wenbin1,2 null    2014, 28 (4): 106-110.   Abstract （999）            Knowledge map    The stability of the tailing slopes under highspeed train induced vibrations is directly related to the train operation safety. This paper presents a case history of the stability of a tailing slope in Fujian. The development of dynamic shear modulus ratio (G/Gmax) and the change of the dynamic damping ratio (λ) with the dynamic shear strain (γ) under different confining pressures are obtained through the characterization of the dynamic parameters of the tailing silt other tiling soil samples with the dynamic triaxial shear tests and resonant column tests. Based on the measured vibration and the acceleration characterization of the highspeed trains, the stability and liquefaction of the tailing slopes are evaluated. The results indicate that the stability is not a concern and the liquefaction und the vibration is not likely. Related Articles | Metrics

Select

Cast-In-Place Concrete Pile Installation in Talus Covered Karst Area XIAO Yucheng, GU Bingshen null    2014, 28 (6): 60-63.   Abstract （1544）            Knowledge map    The talus is consists of boulders with various sizes, rock fragments and small amount of soils. It has a loose structure with large voids. The karst area has well developed rock caverns, pinnacles and rock fissures. The deep foundation type selection in the talus covered karst area is relative easy but the pile installation is critical to the construction schedule and the cost of the project. The rock percussion advancement with mud slurry for the borehole protection and other techniques is a proven success to this subsurface condition. The construction practice indicates that the manually controlled percussion drilling is a better choice for castinplace piles in talus covered karst areas. Related Articles | Metrics

Select

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

Select

Ground Settlement in Soft Soils Due to the Very Large Pile Static Loading Tests with Dead Weights ZHENG He, ZHANG Zhongze, QIN Zhijun null    2016, 30 (5): 611-614.   Abstract （1103）            Knowledge map    The bearing capacity of ground soils, the maximum output of the testing equipment and testing safety are the integral parts of a successful very large pile static loading test with dead weights. If the loading program can use the combination of stocking and hanging with cantilever beams, the height of the stocking can be effectively reduced so that the potential tilting and overturning induced by the differential settlement of the ground. The monitoring results indicate that, although large settlements are observed at the loading supporting piers, the settlements are even due to the pile supported piers. The settlement pattern approaches stable immediately after the loading. The settlement at the reference pile was less than 5 mm and has minor impact on the loading data. Usually, for the large static loading test, distances among the test pile, side pier of the loading platform as well as the reference pile are very difficult to meet the 3D requirement. Related Articles | Metrics

Select

Mechanical Characteristic of Shallow Calcareous Sands from Coral Reefs LIU Jiang null    2016, 30 (6): 696-698.   Abstract （1221）            Knowledge map    The shallow coral reefs are mainly deposited by the calcareous sands and gravels which somewhat special to the conventional geotechnical properties of quartz sands and gravels. The basic mechanical characteristics of the calcareous sands from the surficial part of a coral reef are investigated throughout the conventional consolidation tests and direct shear tests. The results indicate that the void ratios of the calcareous sand are much greater than sands from other origin. Under the increased confining pressures, the void ratios of the samples are slightly reduced with a magnitude less than 10%. A large compressibility of loose calcareous sands and the compression modulus increase with the sand deposition depth. Form a loose calcareous sand deposit in coral reefs, the unit weight usually increases with the depth; however, the shear strength of the calcareous sand is generally constant with depth. More test evident is necessary to verify that relationship between the density and shear strength. Related Articles | Metrics

Select

Overview of research on dynamic response of fiber-reinforced soil QIAN Yelin 1,2, GUO Panpan 2, WANG Jie 1, LV Weike 1, SHAN Shengbiao 2, WANG Yixian 2 null    2016, 30 (6): 705-713.   Abstract （1094）            Knowledge map    Soil reinforcement with randomly distributed discrete fibers is an efficient technology which can improve significantly the strength and deformation characteristics of soil subjected to static and dynamic loads. At present, existing studies are mainly concentrating on the responses of fiberreinforced soil to static load, while the behaviors of fiberreinforced soil under dynamic load are not well evaluated. Nevertheless, the dynamic responses of fiberreinforced soil are very important to the stability of engineering structures subjecting to various kinds of dynamic loads, such as earthquake, sea wave, machine vibration, etc. In this paper, the current situation of existing researches upon dynamic behavior of soil reinforced with randomly distributed fibers is reviewed, summarized, and evaluated, based on which, suggestions on the future research work for dynamic behavior of fiberreinforced soil are proposed, hoping for making a contribution to the subsequent researches and to better applying fiber reinforcement to geotechnical engineering. Related Articles | Metrics

Select

Application of High Density Resistivity Method in the Engineering Geological Investigation of the Huaihe River Crossing Tower for a 1000 kV UHV Transmission Line ZHU Fuguang, LI Bo, LIU Xiaodong, FAN Youwang, PENG Bin null    2017, 31 (1): 45-48.   Abstract （1285）            Knowledge map    The high density resistivity is an important geophysical survey method. Based on the different electrical resistance of different materials, the subsurface soil conditions can be surveyed by studying the electrical field of the ground. In recent years, the high density resistivity receives wider applications in the geological investigations. This paper presents the high density resistivity survey results for the Huaihe River Crossing Tower for 1000kv UHV Transmission Project. Verified by the test boring data, it is concluded that the high density resistivity method can accurately overburden soil and the bedrock. Compared with other conventional geological investigation methods, such as, test boring, cone penetration test and dynamic cone penetration test, this method has also the advantage of easy to operate, it can also collect a large amount of data and provides rich geological information. Related Articles | Metrics

Select

Design and Manufacture of a Model Test Box for the Underground Space and Engineering JIA Qiang1, WANG Haodong1, LI Chenglong1, ZHANG Xin1, SHAO Kun2 null    2017, 31 (1): 112-114.   Abstract （1014）            Knowledge map    This paper presents a design sketch for the physical model test box for the underground space and engineering. The test box consists of steel plate and hot rolled steel corners connected with horizontal whalers and bolts. The four corners of the test box are formed by the steel corners and plates with bolts. This type of connection forms the skeleton of the box and it can also minimize the slip of the soil inside the box. The paper also provides the design sketch of the model test box. Related Articles | Metrics

Select

Application of Vacuum Tube Dewatering Technique in Deep Aquitard Layers MIAO Wang, ZOU Jianfeng, ZHAN Zhixi, ZHANG Haifeng null    2017, 31 (5): 549-553.   Abstract （1000）            Knowledge map    The application of vacuum tube dewatering technique was used in Contract Package IIB of water tunnel of the YellowRiverCrossing project in MidRoute of SouthtoNorth water transfer project. The principles as well as results of applying this dewatering method in the low permeability aquifer soils are introduced throughout theoretical approach, construction monitoring and laboratory testing results. The mechanism, range of applications and expected results are also evaluated in the paper. The results indicate that the vacuum tube dewatering method can be effectively applied in soils high water retention, such as, silty loam, silty clay, clay and mucky clay. This dewatering method can effectively drain the capillary and gravity water in the soil and accelerate the consolidation process in a relatively shorter time. It is also cost effective. Related Articles | Metrics

Select

Influencing Factors for Particle Breakage of the Calcareous Sand under Triaxial Tests WENG Yiling1, YIN Juan1, CHEN Weijun1, YU Kefu2, WANG Xinzhi3 null    2019, 33 (3): 295-298.   Abstract （442）            Knowledge map    Extensive triaxial tests were performed on calcareous sand samples from coral reefs in South China Sea to study the properties of particle breakage. Factors that might affect the particle breakage, such as, confining pressure, sample grain size, sample gradation, degree of compaction, drainage condition and initial sample moisture content, were studied. The following conclusions can be obtained: the particle breakage of the calcareous samples is related to the magnitude of confining pressure and does not have relationship with the sample grain size. Well graded samples have less amount of particle breakage; higher degree of compaction increases the amount of particle breakage; under different drainage conditions in the triaxial tests, the effective confining pressure has a large influence; the particle breakage increases with the initial moisture content of samples. Related Articles | Metrics

Select

Evaluation of Expansive Rock underneath the Nanjing Fourth Yangtze River Crossing Bridge Site WANG Jianguo, ZHANG Chun null    2019, 33 (5): 584-586.   Abstract （383）            Knowledge map    As a special rock type, the expansive rock is widely distributed in all over the world. The physical and mechanical properties usually change with moisture content. When the expansive rock is developed in between the strength rock layers, the existence of the expansive rock is often ignored and might impose a geo-hazard to the engineering projects. The expansion and contraction in these rock masses change with the adjacent environment and the strength of the rock masses gradually reduce. Due to the difference of mineral composition, structure and sedimental environment, embedment depth and variation of the rock mass thickness, the properties of expansive bedrock are different. The repetitive contraction and expansion characteristics of the expansive rock and their associated fissures are likely result in the damage of building structures above. The study of the engineering properties of expansive rock and their classifications for the engineering purposes are very impotant. Related Articles | Metrics

Select

Remediation of the Collapse at the Urgency Stopping Zone of a Deeply Embedded Tunnel LIU Xiaowei Soil Engineering and Foundation    2020, 34 (3): 292-295.   Abstract （302）            Knowledge map    The collapse hazards are frequently encountered in the tunnel excavations, especially, in the emergency stopping zone. The economical and life loss induced by these failures are often huge and the even uncountable. This paper presents a case history of remediation of the collapse at Yangbajing No. 1 Tunnel on December 4th, 2018. The reinforcement method was able to be proposed based on the collapse and geotechnical and geological information at the site. The following measures were used during the remediation: the ground penetrating radar was used to control the quality of the construction in the collapsed zone so that the following collapses were avoided. Related Articles | Metrics

Select

Influence of a Deep Excavation on the Adjacent Tunnel XIA Ming Soil Engineering and Foundation    2020, 34 (4): 469-473.   Abstract （284）            Knowledge map    With the increasing commercial estate opportunity along the subway lines, large size deep excavations are frequently encountered adjacent to the metro tunnel alignments. The excavation induced unloading at these large sized deep excavation projects might result in the deformation of the adjacent tunnels. If the excessive deformation occurs in the tunnel structures, the safe operation of the metro cars might be compromised. This paper presents a deep excavation history in Nanchang City. The influence of the deep excavation on the adjacent metro tunnel structures are investigated with three different analytical methods. Related Articles | Metrics