兰州轨道交通1号线被动式桩基托换技术的应用
马文杰1,2王旭3王炳龙1,2王博林3王学磊4
Application of Passive Pile Foundation Underpinning Technology on Lanzhou Rail Transit Line 1
MA WenjieWANG XuWANG BinglongWANG BolinWANG Xuelei
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作者信息:1.同济大学道路与交通工程教育部重点实验室，201804，上海；
2.上海市轨道交通结构耐久与系统安全重点实验室，201804，上海；
3.兰州交通大学土木工程学院，730070，兰州；
4.兰州市轨道交通有限公司，730070，兰州
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Affiliation:The Key Laboratory of Road and Traffic Engineering, Ministry of Education, Tongji University, 201804, Shanghai, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2020.07.010
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中图分类号/CLCN:TU473.1
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栏目/Col:研究报告
摘要:
以兰州轨道交通1号线穿越既有桥梁鱼儿沟桥工程为研究背景，首先采用MIDASCivil软件对其进行数值模拟，分析托换前后既有桩与托换桩的轴力变化规律及桩基竖向位移的变化；并进行室内模型试验，探讨桩基的承载性能。结果表明：桩基竖向位移最大值发生在托换后且同时截断两根桩的托换承台上方；托换桩荷载分担比随着距离既有桩的位置由近至远依次为29.3%、19.8%，既有桩所在位置处荷载分担比为40.6%；拉应力最大值出现在截断一根桩的位置处，为1.69 MPa；数值模拟承台荷载分担比约为14.3%。室内模型试验中，荷载分担比范围为14.1%～14.85%。
Abstracts:
Taking the project of Lanzhou rail transit Line 1 crossing the Yu′ergou Bridge as the research background, MIDAS\|Civil software is used for numerical simulation of the project, the axial force variation law and the vertical displacement of existing pile and underpinning pile before and after underpinning are analyzed. Through the indoor model test, the bearing capacity of pile foundation is discussed. The results show that the maximum vertical displacement of pile foundation occurs at the pedestal top of two piles which are truncated at the same time, the load sharing ratio of underpinning piles with the distance of the existing piles from near to far is 29.3% and 19.8%, and the load sharing ratio of the existing piles is 40.6%. The maximum tensile stress value is 1.69 MPa, appearing at the position where a pile is truncated, and the load sharing ratio of numerical simulation cap is 10.3%, the variation range of load sharing ratio is 14.1%～14.85% in the indoor model test.
引文 / Ref:
马文杰，王旭，王炳龙，等.兰州轨道交通1号线被动式桩基托换技术的应用[J].城市轨道交通研究，2020，23（7）：51.
MA Wenjie，WANG Xu，WANG Binglong，et al.Application of Passive Pile Foundation Underpinning Technology on Lanzhou Rail Transit Line 1[J].Urban mass transit，2020，23（7）：51.
MA Wenjie，WANG Xu，WANG Binglong，et al.Application of Passive Pile Foundation Underpinning Technology on Lanzhou Rail Transit Line 1[J].Urban mass transit，2020，23（7）：51.
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