| 近铁路基坑通风井段变形特征及其机制分析 |
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| 引用本文： | 李立云,王子英,王晓静,杜修力.近铁路基坑通风井段变形特征及其机制分析[J].吉林大学学报(地球科学版),2021,51(5):1441-1451. |
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| 作者姓名： | 李立云 王子英 王晓静 杜修力 |
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| 作者单位： | 北京工业大学城市与工程安全减灾教育部重点实验室, 北京 100124 |
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| 基金项目： | 北京市科技计划项目（Z181100009018001）；北京工业大学研究生科技基金项目（ykj-2018-00601） |
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| 摘 要： | 针对长春某地下车站深基坑工程，深入研究了基坑开挖过程中近铁路侧通风井段险情的发生过程及其致险机制。通过分析通风井附近桩身水平位移、桩顶水平位移、支撑轴力以及铁路道轨两侧路肩沉降差，探讨了通风井段基坑变形过大的原因；采用ABAQUS有限元软件对该基坑的施工过程进行数值模拟，分析了通风井段基坑施工险情的发生机制。研究结果表明，通风井段基坑变形过大是由岩土体过度应力释放和基坑变形空间效应共同作用导致。由于通风井处阳角的存在，且施工过程中通风井段基坑未架设斜撑，致使该处基坑变形的空间效应显著，坑壁产生指向通风井的扭转变形；开挖速度过快、支撑安装不及时和岩土体中过度应力释放导致围护桩变形过大，使基坑的稳定性变差。
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| 关 键 词： | 基坑 变形特征 施工过程 数值模拟 |
| 收稿时间： | 2020-11-03 |
Study on Deformation Characteristics of Ventilation Shaft Section in Foundation Pit Excavation Adjacent to Railway |
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| Li Liyun,Wang Ziying,Wang Xiaojing,Du Xiuli.Study on Deformation Characteristics of Ventilation Shaft Section in Foundation Pit Excavation Adjacent to Railway[J].Journal of Jilin Unviersity:Earth Science Edition,2021,51(5):1441-1451. |
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| Authors: | Li Liyun Wang Ziying Wang Xiaojing Du Xiuli |
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| Institution: | Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China |
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| Abstract: | In this paper, for a deep foundation pit of an underground station in Changchun, the instability crisis and its mechanism in the ventilation shaft section during the excavation of the foundation pit are studied in depth. Through the analysis of the horizontal displacement of the pile body, the horizontal displacement of the pile top, the support axial force of the bracing, and the settlement difference of the shoulders on both sides of the railway track, the major causes of the excessive deformation of the foundation pit in the ventilation shaft section are discussed. Then, the construction process of the foundation pit is simulated using ABAQUS finite element software, and the instability mechanism of the foundation pit in the ventilation shaft section is analyzed. The results demonstrate that the excessive deformation of the foundation pit in the ventilation shaft section is caused by the coupling of the excessive stress release of strata and the spatial effect of the foundation pit deformation. The spatial effect of the foundation pit deformation in the ventilation shaft section is remarkable due to the existence of positive corner in the ventilation shaft and the absence of diagonal bracing during construction, and the pit wall produces torsional deformation pointing to the inside of the ventilation shaft. The excessive excavation and unsuitable support installation lead to the excessive stress release in strata, which causes the excessive deformation of retaining piles and deteriorates the stability of the foundation pit. |
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| Keywords: | foundation pit deformation characteristics construction process numerical simulation |
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