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Experimental and numerical interpretation on composite foundation consisting of soil-cement column within warm and ice-rich frozen soil

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Journal of Mountain Science 2024年第1期21卷 313-321页

作者： WANG Honglei ZHANG Jianming WEI Shoucai SUN Zhizhong ZHANG Hu School of Civil Engineering Hebei University of EngineeringHandan 056038China State Key Laboratory of Frozen Soil Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Second Geological Brigade Bureau of Geology and Mineral Resources Exploration and DevelopmentLhasa 850000China Da Xing’anling Observation and Research Station of Frozen Ground Engineering and Environment Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesJiagedaqi 165100China School of Civil Engineering Northeast Forestry UniversityHarbin 150040China

Affected by climate warming and anthropogenic disturbances, the thermo-mechanical stability of warm and ice-rich frozen ground along the Qinghai-Tibet engineering corridor(QTEC) is continuously decreased, which may delay the construction of major projects in the future. In this study, based on chemical stabilization of warm and icerich frozen ground, the soil-cement column(SCC) for ground improvement was recommended to reinforce the foundations in warm and ice-rich permafrost regions. To explore the validity of countermeasures mentioned above, both the original foundation and the composite foundation consisting of SCC with soil temperature of -1.0℃ were prepared in the laboratory, and then the plate loading tests were carried out. The laboratory investigations indicated that the bearing capacity of composite foundation consisting of SCC was higher than that of original foundation, and the total deformation of original foundation was greater than that of composite foundation, meaning that overall stability of foundation with warm and ice-rich frozen soil can be improved by SCC installation. Meanwhile, a numerical model considering the interface interaction between frozen soil and SCC was established for interpretating the bearing mechanism of composite foundation. The numerical investigations revealed that the SCC within composite foundation was responsible for the more applied load, and the applied load can be delivered to deeper zone in depth due to the SCC installation, which was favorable for improving the bearing characteristic of composite foundation. The investigations provide the valuable guideline for the choice of engineering supporting techniques to major projects within the QTEC.

关键词： Chemical stabilization Ground improvement composite foundation Frozen soil engineering Qinghai-Tibet engineering corridor

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Consolidation solution for composite foundation considering a time-and depth-dependent stress increment along with three distribution patterns of soil permeability

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第4期12卷 268-277页

作者： Meng-meng LU Kang-he XIE Chuan-xun LI Kun WANG State Key Laboratory for Geomechanics and Deep Underground Engineering School of Meehanics & Civil Engineering China University of Mining & Technology Xuzhou 221008 China MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering Zhejiang University Hangzhou 310058 China

In actual engineering practice,the stress increment within a composite foundation caused by external loads may vary simultaneously with depth and *** addition,column installation always leads to a decay of soil permeability towards the ***,almost none of the consolidation theories for composite foundation comprehensively consider these factors until *** this reason,a stress increment due to external loads changing simultaneously with time and depth was incorporated into the analysis,and three possible variation patterns of soil's horizontal permeability coefficient were considered to account for the detrimental influence of column *** three patterns included a constant distribution pattern(Pattern I),a linear distribution pattern(Pattern II),and a parabolic distribution pattern(Pattern III).Solutions were obtained for the average excess pore water pressures and the average degree of consolidation *** several special cases were discussed in detail based on the general solution ***,comparisons were made,and the results show that the present solution is the most general rigorous solution in the literature,and it can be broken down into a number of previous *** consolidation rate is accelerated with the increase in the value of the top to the bottom stress *** consolidation rate calculated by the solution for Pattern I is less than that for Pattern II,which in turn is less than that for Pattern III.

关键词： Consolidation composite foundation Stone column Permeability Ramp load Disturbance effect

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Deformation and failure modes of composite foundation with sub-embankment plain concrete piles

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Research in Cold and Arid Regions 2013年第5期5卷 614-625页

作者： Qian Su JunJie Huang School of Civil Engineering Southwest Jiaotong University Key Laboratory of High-Speed Railway Engineering of Ministry of Education Southwest Jiaotong University

With the development of high-speed railway in China, composite foundation with rigid piles has become a stamdard solution of meeting the high requirements of stability and post-construction settlement of embankment on soft subgrade. Among several im- provement pattems, plain concrete piles have been extensively used to treat soft ground supported embankment. To investigate the deformation and failure modes of unimproved soft ground and soft ground reinforced by sub-embankment plain concrete piles, and to learn the influences of track and vehicle load, the effect of pile spacing, as well as the compression moduli of soil layers and upper load condition on the failure modes, a series of centrifuge model tests were performed. Test results indicate that the dis- placement of unimproved soft ground under the embankment increases continuously as embankment, track and train loading, and slip circle failure takes place. The deformation law of soft ground reinforced by sub-embankment plain concrete piles depends on pile spacing, compression modulus of the soft ground, and loading conditions. It was also found that plain concrete piles show displacement and failure patterns depending on its location, compression modulus of soft soil around the pile, and loading condi- tions. Furthermore, the evaluation of improved ground stability as well as the model test procedure is also presented.

关键词： centrifuge model test composite foundation plain concrete pile deformation and failure modes embankment soft ground

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Numerical Analysis of the Settlement of composite foundation Reinforced with Crushed Stone Grouting Pile and Rigid Bearing Plate

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Journal of Southwest Jiaotong University(English Edition) 2010年第2期18卷 99-106页

作者：邱红胜陈建妹李梅 Institute of Geotechnical and Underground Engineering Huazhong University of Science and Technology School of Transportation Wuhan University of Technology

This paper deals with a new type of crushed stone grouting pile with a rigid bearing plate. The load transfer characteristics were analyzed, and a settlement model of the composite foundation reinforced with crushed stone grouting pile and rigid bearing plate was built by FEM program. The effects of replacement ratio of capping plate, replacement ratio of pile, replacement ratio of grout diffusion zone, pile-soil modulus ratio, and serous-soil modulus ratio, on the composite foundation settlement were discussed. It is concluded that the proposed crushed stone grouting pile with a rigid bearing plate is effective in decreasing the settlement of composite foundation.

关键词： Crushed stone grouting pile composite foundation Settlement Finite element analysis

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Performance of composite foundations with different load transfer platforms and substratum stiffness over silty clay

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Journal of Mountain Science 2024年第5期21卷 1761-1774页

作者： ZHANG Shuming LIU Yan YUAN Shengyang LIU Xianfeng JIANG Guanlu LIU Junyan School of Civil Engineering and Architecture University of JinanJinan 250022China The Engineering Technology Research Center for Urban Underground Engineering Supporting and Risk Monitoring of Shandong Province Jinan 250022China School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China Key Laboratory of High-speed Railway Engineering Ministry of EducationSouthwest Jiaotong UniversityChengdu 610031China

The semi-rigid pile-supported composite foundation is widely used in highway projects due to its effectiveness in increasing the bearing capacity and stability of *** is crucial to understand the stress distribution across the embankment width and the behaviour of unreinforced ***,five centrifuge tests were conducted to examine the bearing and deformation behaviours of NPRS(Non-Connected Piled Raft Systems)and GRPS(GeosyntheticReinforced Pile-Supported systems)with varying substratum stiffness,then a comparative analysis was conducted on embankment settlement,pressures underneath the embankments,and axial forces along the *** results indicated that greater substratum stiffness correlates with reduced settlement and deformation at various *** occurring 5 meters from the embankment toe includes settlement in NPRS and upward movement in *** potential sliding surface is primarily located within the embankment in NPRS,whereas it may extend through both the embankment and foundation in *** pile-soil stress ratio and efficiency in NPRS are higher than in GRPS across the *** axial force borne by end-bearing piles is significantly greater than that by floating *** the buried depth increases,the axial force in GRPS initially rises then declines,whereas in NPRS,it remains relatively constant within a certain range before *** study aids in assessing the applicability of composite foundations in complex railway environments and provides a reference for procedural measures under similar conditions.

关键词： Centrifuge modelling composite foundation Failure mode Load transfer platform Substratum Stiffness Silty clay

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Centrifuge modeling of a large-scale surcharge on adjacent foundation

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 3181-3191页

作者： Zhang J. Ye Z. Zhang D. Huang H. Han S. Zou T. Zhang L. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education and Department of Geotechnical Engineering Tongji University Shanghai 200092 China CCCC Third Harbor Consultants Co Ltd Shanghai 200032 China Qingdao Conson Jiaozhou Bay Second Subsea Tunnel Co. Ltd Qingdao 266000 China

This study investigates the ground and structural response of adjacent raft foundations induced by large-scale surcharge by ore in soft soil areas through a centrifuge modeling test. The prototype of the test is a coastal iron ore yard with a natural foundation of deep soft soil. Therefore, it is necessary to adopt some measures to reduce the influence of the large-scale surcharge on the adjacent raft foundation, such as installing stone columns for foundation treatment. Under an acceleration of 130 g, the model conducts similar simulations of iron ore, stone columns, and raft foundation structures. The tested soil mass has dimensions of 900 mm × 700 mm × 300 mm (length × width × depth), which is remodeled from the soil extracted from the drilling holes. The test conditions are consistent with the actual engineering conditions and the effects of four-level loading conditions on the composite foundation of stone columns, unreinforced zone, and raft foundations are studied. An automatic layer-by-layer loading device was developed to simulate the loading process of actual engineering more realistically. The composite foundation of stone columns had a large settlement after the loading, forming an obvious settlement trough and causing the surface of the unreinforced zone to rise. The 12 m surcharge loading causes a horizontal displacement of 13.19 cm and a vertical settlement of 1.37 m in the raft foundation. The stone columns located on both sides of the unreinforced zone suffered significant shear damage at the sand-mud interface. Due to the reinforcement effect of stone columns, the sand layer below the top of the stone columns moves less. Meanwhile, the horizontal earth pressure in the raft foundation zone increases slowly. The stone columns will form new drainage channels and accelerate the dissipation of excess pore pressure. © 2024 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences

关键词： Centrifuge modeling composite foundation Ground movement Raft foundation Stone column

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Research progress of soft soil foundation treatment technology

Research progress of soft soil foundation treatment technolo...

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作者： Xiaoyi Jiang Qingrui Lu Shijun Chen Renhui Dai Jinhe Gao Ping Li School of Civil and Architectural Engineering East China University of Technology State Key Laboratory of Nuclear Resources and Environment(East China University of Technology)

With the extensive improvement of infrastructure in China in the past ten years,the soft soil foundation is becoming more and more ***,the improvement of soft soil foundation treatment has become a difficult problem that today’s engineering designers have to *** paper systematically reviews the development of soft soil foundation treatment technology in our country,and emphatically introduces the development process of foundation treatment at home and abroad,especially in our country in recent years,which embodies the cross and comprehensive application of various foundation treatment technologies and forms a unique composite reinforcement technology.

关键词： soft soil foundation treatment Overview composite reinforcement technology composite foundation

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ANALYSIS OF SUBGRADE SETTLEMENT INFLUENCED BY NEARBY EXCAVATION DEWATERING

ANALYSIS OF SUBGRADE SETTLEMENT INFLUENCED BY NEARBY EXCAVAT...

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铁道工程新技术：第二届铁道工程关键技术国际学术会议

作者： Shuang LIU Lianjun WANG Xiaoxiao ZHU Guangzong ZHANG School of Civil Engineering Beijing Jiaotong University Beijing 100044

＜正＞In the deep excavation construction process,the influence on the settlement of nearby building due to dewatering is always hardly *** this paper,the influence on railway subgrade foundation by the dewatering of excavation engineering of the nearby new construction Jinan west station of Beijing-Shanghai High-speed Railway Line is *** settlement data of pile foundation subgrade of the high speed railway line are monitored and collected during the whole construction period to analyze the influence on composite foundation due to the dewatering of deep *** settlement of both the top of pile and the soil between plies are *** the construction period includes the following three phases:a) embankment fill period of high speed railway line subgrade construction,and b) preloading period of high speed railway line subgrade construction,and c) excavation engineering of station accessory *** the conclusion,a general law of the influence on the composite foundation due to the dewatering of nearby deep excavation was summarized in this paper as a reference for other similar project in future.

关键词： high-speed Railway excavation dewatering subgrade settlement composite foundation

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