| 地铁车站深基坑开挖变形及数值模拟分析* |
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| 引用本文： | 蒙国往,农忠建,吴波,黄劲松,韦汉.地铁车站深基坑开挖变形及数值模拟分析*[J].中国安全生产科学技术,2020,16(7):145-151. |
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| 作者姓名： | 蒙国往 农忠建 吴波 黄劲松 韦汉 |
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| 作者单位： | （1.广西大学 土木建筑工程学院，广西 南宁 530004;2.广西大学 广西防灾减灾与工程安全重点实验室，广西 南宁 530004;3.广西大学 教育部工程防灾与结构安全重点实验室，广西 南宁 530004） |
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| 基金项目： | * 基金项目: 国家自然科学基金项目(51678164,51478118)；广西自然科学基金项目（2018GXNSFDA138009）；广西科技计划项目（AD18126011）；广西大学科研基金项目(XTZ160590)；广西特聘专家专项资金项目(20161103) |
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| 摘 要： | 为研究土岩复合地层地铁车站深基坑变形时空效应特征与规律，以南宁地铁某车站基坑为研究背景，在不同施工工况下对车站基坑进行有限元数值模拟，并结合实测数据进行对比。结果表明:数值计算值与现场实测值差距较小，2种变形规律接近一致，有限元计算结果合理。围护结构水平位移随施工进行逐渐增大，呈现鼓肚形状，水平位移由桩顶移动到桩身，最大位移稳定在桩身0.5~0.75H处；围护结构受力集中在第2道和第3道内支撑位置；基坑地表沉降中，长边方向的沉降比短边方向沉降明显，空间效应显著；在地铁车站深基坑中，基于时空效应机理，考虑施工影响，在施工过程中调整施工工序和参数，对基坑稳定和控制变形具有重要指导意义。
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| 关 键 词： | 地铁车站 深基坑 时空效应 变形 数值模拟 |
Excavation deformation and numerical simulation analysis of deep foundation pit in subway station |
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| MENG Guowang,NONG Zhongjian,WU Bo,HUANG Jinsong,WEI Han.Excavation deformation and numerical simulation analysis of deep foundation pit in subway station[J].Journal of Safety Science and Technology,2020,16(7):145-151. |
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| Authors: | MENG Guowang NONG Zhongjian WU Bo HUANG Jinsong WEI Han |
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| Affiliation: | (1.College of Civil Engineering and Architecture,Guangxi University,Nanning Guangxi 530004,China;2.Key Laboratory of Disaster Prevention and Engineering Safety of Guangxi,Guangxi University,Nanning Guangxi 530004,China;3.Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,Guangxi University,Nanning Guangxi 530004,China) |
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| Abstract: | In order to study the time space effect characteristics and laws about the deformation of deep foundation pit in the subway station with the soil and rock composite stratum,taking the foundation pit of a subway station in Nanning as the research background,the finite element numerical simulation on the foundation pit of station under different construction conditions was carried out,and the results were compared with the measured data.The results showed that the difference between the numerical value and the field measured value was small,the two deformation laws were close to the same,and the calculation results of finite element were reasonable.The horizontal displacement of retaining structure gradually increased with the construction and presented a bulging shape.The horizontal displacement moved from the pile top to the pile body,and the maximum displacement was stable at 0.5~0.75 H of the pile body.The stress of the retaining structure was concentrated in the second and third internal supporting positions.In the ground settlement of foundation pit,the long side settlement was more obvious than the short side settlement,and the spatial effect was significant.In the deep foundation pit of subway station,based on the mechanism of time space effect and considering the influence of construction,adjusting the construction process and parameters during the construction process has important guiding significance for the stability of foundation pit and the control of deformation. |
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| Keywords: | subway station deep foundation pit time space effect deformation numerical simulation |
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