邻近高速铁路营业线基坑分坑施工变形控制
李晓龙1廖炜炼1肖飞1陈鹤1狄宏规2何舒琦2
Deformation Control for Foundation Pit Segmented Construction Adjacent to Operational High-speed Railway Lines
LI Xiaolong1LIAO Weilian1XIAO Fei1CHEN He1DI Honggui2HE Shuqi2
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作者信息:1.上海东华地方铁路开发有限公司，200071，上海
2.同济大学道路与交通工程教育部重点实验室，201804，上海
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Affiliation:1.Shanghai Donghua Local Railway Development Co., Ltd., 200071, Shanghai, China
2.Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, 201804, Shanghai, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.08.038
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中图分类号/CLCN:TU433;TU46+3
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栏目/Col:研究报告
摘要:
［目的］城市中某些基坑由于用地资源紧张且邻近铁路营业线布置，对基坑施工和铁路运营安全带来了极大挑战。为合理预测和控制基坑和邻近高速铁路路基的变形，需对基坑施工进行变形控制研究。［方法］以上海某邻近高速铁路路基的明挖段基坑为依托，基于Plaxis3D软件，分析不同基坑分坑长度对围护结构和邻近高速铁路路基的影响，并根据实测数据分析分坑开挖对基坑自身和邻近高速铁路路基的变形控制效果。［结果及结论］基坑分坑开挖能够有效减小基坑围护结构以及既有高速铁路路基的变形；分坑长度越短，基坑和既有高速铁路路基的变形越小,基坑分隔墙所形成的坑角效应对围护结构变形的抑制作用越明显。根据现场实测数据，分坑长度为30m的条件下，基坑围护结构变形和高速铁路路基竖向变形均未超过规范限值，但路基水平变形超出限值要求。
Abstracts:
［Objective］ Limited land use resource and arrangement adjacent to operational high-speed railway lines pose significant challenges to some city foundation pit constructions and the railway operational safety. To reasonably predict and control the foundation pit and adjacent high-speed railway subgrade deformations, it is necessary to conduct deformation control studies on foundation pit construction. ［Method］ Based on an open-cut foundation pit near a high-speed railway subgrade in Shanghai, Plaxis 3D software is used to analyze the impact of different foundation pit segmented construction lengths on the enclosure structure and adjacent high-speed railway subgrade, and the deformation control effectiveness of segmented construction on foundation pit itself and adjacent high-speed railway subgrade is analyzed according to field-measured data. ［Result & Conclusion］ Segmented construction can effectively reduce the deformation of both the foundation pit enclosure structure and the existing high-speed railway subgrade. The shorter the segmented length is, the smaller the deformation of foundation pit and existing high-speed railway subgrade, and the more evident inhibition corner effect formed by foundation pit segmentation walls has on enclosure structure deformation. Based on field measurement data, with a segmented length of 30 m, both of the foundation pit enclosure structure deformation and the high-speed railway subgrade vertical deformation remain in standard limits; however, the subgrade horizontal deformation exceeds the limit requirements.
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