不对称水压下基坑围护内力及变形规律分析

张有桔; 丁文其; 刘学增; 王晓形; 武俊东

不对称水压下基坑围护内力及变形规律分析 English Version

张有桔^{1, 2, 3},
丁文其^{2, 3},
刘学增⁴,
王晓形⁴,
武俊东^{2, 3}

1. 安徽省交通规划设计研究院有限公司,安徽合肥 230088; 2.同济大学土木工程学院地下建筑与工程系,上海 200092; 3. 同济大学岩土及地下工程教育部重点实验室,上海 200092; 4. 上海同济建设工程质量检测站（上海同岩土木工程科技有限公司）,上海 200092

基金项目: 无锡轨道交通一号线土建科研项目（GD01KYHT0901）

详细信息

作者简介:
张有桔(1986- )，男，硕士，安徽省交通规划设计研究院有限公司岩土隧道分院，主要从事地下工程设计、施工力学、动态反馈与控制理论研究。E-mail: dabaozyj@163.com。

中图分类号: TU413
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出版历程
- 收稿日期: 2013-06-05
- 发布日期: 2013-11-24

Internal force and deformation of deep foundation pit under asymmetric water pressure

ZHANG You-jie^{1, 2, 3},
DING Wen-qi^{2, 3},
LIU Xue-zeng⁴,
WANG Xiao-xing⁴,
WU Jun-dong^{2, 3}

1. Anhui Transport Consulting & Design Institute Co., Ltd., Hefei 230088, China; 2.Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 3. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 4. Shanghai Tongji Institution of Inspection on Construction Quality (Shanghai Tongyan Civil Engineering Technology Co., Ltd.), Shanghai 200092, China

摘要

摘要: 以某地铁车站基坑为背景,通过有限元数值分析的方法,对比分析深基坑两侧围护结构在不对称水压和对称水压作用下内力及变形的变化规律,以期对类似工程设计施工提供经验指导。分析结果表明：不对称水压下基坑围护结构向水压力小侧发生一定偏移变形,导致水压力较大侧围护变形增大,对基坑安全和环境保护不利,而不对称水压对围护内力分布影响不大；对比对称水压工况,不对称水压下高水位侧围护内力基本不变,而低水位侧围护内力减小明显,同时一侧水位降低后支撑轴力明显减小,减小之和与围护体系两侧水头差相当；后期开挖的坑内土体随着坑内降水不断固结沉降,将引起基坑围护结构的变形。
- 深基坑 /
- 不对称水压 /
- 围护内力 /
- 围护变形
Abstract: Based on the foundation pit of a subway station, the internal force and deformation of deep foundation pit under asymmetric water pressure and symmetric water pressure are comparatively analyzed by means of the two-dimensional finite element numerical method. The variation of the internal forces and deformation of supporting structures is obtained so as to provide experience and guidance for design and construction of similar projects. The results show that the supporting structures under asymmetric water pressure has some offset deformation toward the lower water pressure side, and the deformation at the higher water pressure side increases simultaneously. This deformation mode is harmful to the safety of the deep foundation pit and the environmental protection, but the asymmetric water pressure has little effect on the internal force distribution of the supporting structures. Compared with that under symmetric water pressure condition, the internal force at the higher water pressure side basically does not change, but the internal force at the lower water pressure side decreases significantly under asymmetric water pressure condition. The axial force of supporting structures reduces as the water level decreases, and the reduction basically equals to the water head difference between both sides. The consolidation settlement induced by dewatering of the late excavated soils inside the foundation pit causes the deformation of supporting structures.
- deep foundation pit /
- asymmetric water pressure /
- internal force /
- deformation

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参考文献(7)

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