坑底加固置换率对杭州地铁湘湖站深基坑安全的影响分析

刘雪珠; 张艳书; 顾蒙娜; 庄海洋

doi:10.11779/CJGE2016S2022

坑底加固置换率对杭州地铁湘湖站深基坑安全的影响分析 English Version

1. 江苏省岩土工程公司,江苏南京 210009;
2. 南京工业大学岩土工程研究所,江苏南京 210009

基金项目: 江苏省地质矿产勘查局科研项目（2013-科研-13）; 中国博士后基金项目（2014M551909）

详细信息

作者简介:
刘雪珠(1970- ),男,博士,高级工程师,主要从事岩土工程设计、施工研究。E-mail: 1792960738@qq.com。

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出版历程
- 收稿日期: 2016-05-18
- 发布日期: 2016-10-19

Effects of reinforcement replacement rates at pit bottom on safety of deep foundation pit of Xianghu metro subway station in Hangzhou

1. Geo-technical Engineering Company of Jiangsu Province, Nanjing 210009, China;
2. Institute of Geotechnical Engineering, Nanjing Technology University, Nanjing 210009, China

摘要

摘要: 针对杭州地铁1号线湘湖站北二基坑的坍塌事故,建立了基坑开挖全过程模拟的三维有限元分析模型,分析了坑底加固置换率对该深基坑侧向位移、地连墙弯矩和内支撑轴力的影响规律,并把计算结果与该基坑坍塌事故现象进行了对比分析。结果表明：当置换率小于60%时,其对该深基坑的水平侧移和弯矩都有较大的影响,当置换率大于60%时这种影响明显变小;置换率对内支撑轴力的影响主要体现在对底层内支撑的影响最大,而对其他内支撑轴力的影响基本一致。通过与该基坑坍塌事故的对比,可以发现置换率对地连墙弯矩的主要影响范围正与本次事故地连墙的折断位置相吻合,且该基坑已加固区的围护结构没有坍塌这一现象也再次证明基坑底部加固对该基坑安全起着重要的作用。
- 地铁车站 /
- 深基坑 /
- 地基加固 /
- 坍塌 /
- 有限元分析
Abstract: For the collapse accident of the second foundation pit at the north side of Xianghu station of Hangzhou metro line No. 1, a three-dimensional finite element model is established to simulate the whole excavation process of the deep foundation pit. Then, the effects of different reinforcement replacement rates at the bottom of pit on the safety of deep foundation pit of Xianghu station are analyzed. The results show that the reinforcement replacement rate has great influence on the lateral displacement and the moment of the diaphragm wall of the deep foundation pit when the replacement ratio is less than 60%. However, as the replacement ratio is greater than 60%, this kind of effect decrease obviously. The axial force on the inner support is also influenced obviously by the replacement ratio, which mainly shows that it has the maximum effect on the lowest inner support. By contrast with the collapse accident of the pit of Xianghu subway station, it is found that the major impact area of the moment of the diaphragm wall generated by different replacement ratios is consistent with the broken position of the diaphragm wall in the collapse accident. However, the retaining structures have no collapse when the bottom ground is reinforced, which proves again that the reinforced bottom of foundation pit plays a significant role in this accident.
- subway station /
- deep foundation pit /
- foundation reinforcement /
- collapse /
- finite element analysis

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参考文献(11)

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