砂土区地铁车站深基坑盖挖逆作法施工变形规律分析
刘学明1王国林1孙东晓1柳策2张宁2
Deformation Law Analysis of Metro Station Deep Foundation Pit Constructed by Cover-Excavation Reverse Method in Sandy Area
LIU Xueming1WANG Guolin1SUN Dongxiao1LIU Ce2ZHANG Ning2
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作者信息:1.中铁上海工程局集团市政环保工程有限公司，201906，上海
2.沈阳工业大学建筑与土木工程学院，110870，沈阳
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Affiliation:1.Municipal Environmental Production Engineering Co., Ltd., of CREC Shanghai Group， 201906， Shanghai， China
2.School of Architecture and Civil Engineering， Shenyang University of Technology， 110870， Shenyang， China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.10.015
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中图分类号/CLCN:U231.4；TV551.4+2；U455.45
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栏目/Col:研究报告
摘要:
［目的］地铁车站盖挖逆作法施工过程中主体结构受力变形特征较为复杂，而砂土地区地铁车站施工力学过程更为复杂，致使砂土区基坑施工难度大大提升，因此需对砂土区地铁车站深基坑盖挖逆作法施工变形特征进行深入研究。［方法］依托沈阳某地铁车站工程，对富水深厚砂层地质下的深基坑盖挖逆作法施工变形特性进行了阐述。采用数值模拟的方法，详细分析了基坑施工过程中地下连续墙水平位移、层板位移、中立柱位移、地下连续墙与邻近中立柱差异沉降的变化规律。［结果及结论］地下连续墙位移变形受基坑施工影响显著，其水平位移变形随基坑开挖深度增加而不断变大，均以向坑内的变形为主；层板起到了很好的支撑作用，有效控制了围护结构的水平位移，主要呈现为隆起变形，其中顶板受基坑施工的影响最大；中立柱在竖向及水平方向上均发生变形，受深基坑土体卸载效应影响，主要以竖向的隆起变形为主；地下连续墙及中立柱的差异沉降随施工进行逐渐增大，在开挖底层土体时达到最大。
Abstracts:
［Objective］ Stress deformation characteristics of the main structure in the process of metro station construction by cover-excavation reverse method are relatively complex. The construction mechanics process of the subway station in the sandy area is even more complex, which greatly increases the construction difficulty of the foundation pit in this area. Therefore, it is necessary to conduct in-depth research on the deformation characteristics of metro station deep foundation pit constructed by cover-excavation reverse method in sandy area. ［Method］ Based on a metro station project in Shenyang City, the deformation characteristics of deep foundation pit cover excavation reverse construction in water-rich deep sandy stratum is elaborated. Numerical simulation is used to analyze the change law of diaphragm wall horizontal displacement, slab displacement, neutral pillar displacement and differential settlement between diaphragm wall and adjacent neutral pillar during foundation pit construction. ［Result & Conclusion］ The results show that the displacement deformation of diaphragm wall is significantly affected by the construction of the foundation pit, and its horizontal lateral displacement deformation increases continuously following the excavation depth of the foundation pit increase, with all deformation mainly towards the direction of the pit. The slabs play a good supporting role, effectively controlling the horizontal displacement of the enclosure structure, and manifesting mainly as heave deformation, among which the roof plate is most affected by the foundation pit construction. The neutral pillar is deformed in both vertical and horizontal directions, mainly in the form of vertical heave deformation due to soil unloading effect of the deep foundation pit. The differential settlement of the diaphragm wall and the neutral pillar increases gradually with the construction progress, and reaches the maximum in the excavation of the underlying soil.
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