河湖相沉积软土地层地铁车站深基坑施工位移分析
白学平
Analysis of Metro Station Deep Foundation Pit Construction Displacement in Fluvial and Lake Sedimentary Soft Soil Stratum
BAI Xueping
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作者信息:青海省交通规划设计研究院有限公司，810008，西宁
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Affiliation:Qinghai Transportation Planning and Design Institute Co., Ltd., 810008, Xining, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2023.06.011
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中图分类号/CLCN:U4456.3+1： U231.4
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栏目/Col:研究报告
摘要:
为研究河湖相沉积环境下的软土深基坑在施工过程中的变形规律，以佛山轨道交通2号线某车站深基坑工程为研究对象，在进行实际开挖和布设监测点的基础上，结合工程地质条件建立三维数值模型，对基坑围护结构、地面沉降和地下连续墙墙体水平位移等进行了对比分析。结果发现：该软土深基坑长边方向最大水平位移监测值为23.0~24.0 mm，短边方向最大水平位移监测值为13.5 mm，基坑水平位移曲线整体呈拱形；基坑长边方向地面沉降监测最大值25.0 mm，短边方向地面沉降监测最大值为14.5 m，距基坑边缘6.8 m，其曲线呈宽“V”字型；深基坑三维数值模拟结果与监测结果基本一致，与监测值相比最大误差为10%~12%；开挖深度达到7 m时，基坑深部土体由于嵌固作用和围护结构内移存在隆起趋势，开挖完成后隆起位移达到4.1 mm；通过监测和模拟手段对此类型软土深基坑施工过程中的变形规律进行了验证，其变形值均未超过基坑变形控制上限。
Abstracts:
In order to study the deformation law of soft soil deep foundation pit in fluvial and lake sedimentary environment, taking the deep foundation pit project of a station along Foshan Rail Transit Line 2 as research object, based on actual excavation and layout of monitoring points, combined with its engineering geological conditions, a three dimensional numerical model is established, and a comparative analysis of the foundation pit retaining structure, land subsidence and diaphragm wall horizontal displacement is carried out. The results reveal that the maximum monitoring horizontal displacement of the soft soil deep foundation pit long side is 23.0~24.0 mm, that of the short side is 13.5 mm, and the displacement curve is overall arched; the land subsidence monitoring maximum value in foundation pit long side direction is 25.0 mm while that in short side direction is 14.5 m, and is 6.8 m away from pit edge with the curve showing a wide ′V′ shape; the foundation pit 3D numerical simulation results are generally consistent with the monitoring values, and the biggest deviation from monitoring value is 10% to 12%; when excavation depth reaches 7 m, the foundation pit deep soil shows heave tendency due to solidification effect and retaining structure moving inward, the heave displacement reaches 4.1 mm after the excavation is completed; through monitoring and simulation means, the deformation law of deep foundation pit construction in this type of soft soil is verified, and the deformation value didn′t exceed foundation pit deformation control limit.
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