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《China Railway Science》 2017-01
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Seepage Stability Analysis of Deep Foundation Pit of Lanzhou Metro under the Condition of Water Level Reduction in Collapsible Loess

ZHOU Yong;WANG Xiaoli;ZHU Yanpeng;GAO Sheng;Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province,Lanzhou University of Technology;Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education,Lanzhou University of Technology;China Railway First Survey & Design Institute Group Co.,Ltd.;  
Taking the deep foundation pit of Lanzhou metro in collapsible loess as the research object,the real-time monitoring of the pile body horizontal displacement of bored pile,the sedimentation of earth surface around pit,supporting axial force and the groundwater level was carried out during the excavation of deep foundation pit.The three-dimensional seepage stress coupling model for station end well was established by using Midas Gts software and the seepage stability of station deep foundation pit under the condition of water level reduction was analyzed.Results showed that,for the excavation of deep foundation pit under the condition of water level reduction,the horizontal displacement of pile body increased with the increase of excavation depth,and presented the characteristics of large increase in the middle and small increase at both ends.The maximum horizontal displacement of pile body usually appeared at the 1/2to 2/3excavation depth of foundation pit.The removal of steel support had a great impact on the axial force of adjacent steel support.Therefore,the removal scheme for steel support should be rationally designed.The pore water pressure from the inside to the outside of foundation pit showed an increasing trend.Water level reduction in the inside of deep foundation pit had less impact on retaining structure,while water level reduction in the outside of deep foundation pit would lead to the increase in effective stress and ground settlement.Numerical simulation results agreed with field monitoring results.The support form of bored pile with steel support could effectively control the deformation of the retaining structure of deep foundation pit in collapsible loess and the sedimentation of earth surface around pit.
【Fund】: 国家自然科学基金资助项目(51568042);; 教育部长江学者和创新团队发展计划项目(2013IRT13068);; 兰州理工大学红柳青年教师培养计划项目(Q201108)
【CateGory Index】: U231.3
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