半幅铺盖法施工的地铁车站基坑中铺盖体系的稳定性研究*
李华磊1王碧云2
Stability of the Pavement System in Metro Station Foundation Pit Construction by Semi-pavement Method
LI HualeiWANG Biyun
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作者信息:1.新乡职业技术学院建筑工程系，453006，新乡；
2.陕西建工第五建设集团有限公司,710086,西安
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Affiliation:Department of Architectural Engineering, Xinxiang Vocational and Technical College, 453006, Xinxiang, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2020.10.025
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中图分类号/CLCN:TU433；U231.4
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栏目/Col:研究报告
摘要:
半幅铺盖法修建地铁车站时，基坑的围护结构除受土的卸荷作用外，铺盖上方还要承受车辆的自重荷载，因此研究围护结构的变形和内力变化规律对确保地铁建设中基坑的稳定是十分必要的。以某地铁车站为研究案例，通过数值模拟和施工现场监测相结合的方法研究基坑在开挖过程中围护结构的变形规律，得到如下结论：①数值模拟显示中间桩桩顶水平位移最大值是6.54 mm，最大沉降值是5.8 mm；②基坑周边的沉降由近及远呈“倒锅型”，基坑开挖至13 m和19 m处基坑周边地表的沉降变化最为明显，距离地下连续墙4.6 m处地表沉降达到最大值8.914 mm。现场监测数据验证了数值模拟结果的正确性，并且根据工程地质、监测数据和周边环境分析了影响基坑稳定性的因素。
Abstracts:
The foundation pit enclosure is not only subjected to the unloading effect of soil, but also to the self-weight load of vehicles in metro station construction by semi-pavement method. Therefore, it is necessary to study the deformation and internal force variation of the pit support structure during metro construction to ensure the stability of the foundation pit. Taking a metro station as the case study, the deformation law of the retaining structure during the foundation pit excavation is studied through numerical simulation and construction site monitoring. The conclusions are as follows: 1) the numerical simulation shows that the maximum horizontal displacement of the middle pile top is 6.54 mm and the maximum settlement value is 5.8 mm; 2) the settlement around the foundation pit presents an “inverted pot” type from near to far, the settlement changes are most obvious when the foundation pit is excavated from 13 m to 19 m, and the ground settlement will reach the maximum value of 8.914 mm at 4.6 m away from the underground continuous wall. The field monitoring data have verified the correctness of the numerical simulation results, and factors affecting the foundation pit stability are analyzed according to the engineering geology, monitoring data and the surrounding environment.
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