岩土力学 2017, 38(8) 2306-2312 DOI:     ISSN: 1000-7598 CN: 42-1199/O3

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岩土工程研究
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PubMed
非对称开挖基坑支撑式围护结构解析解
徐长节1, 2,殷 铭1,胡文韬2
1. 浙江大学 滨海和城市岩土工程研究中心,浙江 杭州 310058;2. 华东交通大学 土木建筑学院,江西 南昌 330013
摘要: 随着城市建设发展的需要,有两种甚至多种开挖深度的深基坑越来越常见,但设计时常按开挖较深侧单边设计,忽略两侧开挖深度不同带来的影响。基于等值梁法,通过改进开挖较浅侧围护结构所受土压力模式,推导了能考虑两侧挖深不同的支撑式围护结构深度计算公式,探讨了基坑开挖的非对称程度对围护结构插入比的影响。结果表明,相比于仅按单边设计,挖深较深侧对挖深较浅侧的推挤作用会使挖深较浅侧围护结构插入比增大,增大的幅度随非对称开挖程度的增加而增大,且挖深较深侧挖深越大,增大效应越显著。工程实例表明,综合考虑两侧挖深差异的影响,比仅按挖深较深侧单边设计更加经济、合理。
关键词
Analytical solutions of calculating length of retaining structures of foundation pit under asymmetric excavation
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1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou, Zhejiang 310058, China; 2. School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang, Jiangxi 330013, China
Abstract: As the increasingly harsh conditions of deep excavation in urban area, two or more different depths of excavation in one foundation pit are becoming more common. Ignoring the influences caused by two different asymmetric excavations, traditional method to solve this problem is simplifying the asymmetric excavation as symmetrical and using the deeper side in calculation. Given that, analytical solutions for the length of retaining structures in foundation pit considering the influences caused by two different asymmetric excavations have been deduced using the equivalent beam method. The influences on differences between retaining structures on two sides and their insertion ratio caused by two different asymmetric excavations have been investigated. The results show that, considering two different asymmetric excavations, insertion ratio of retaining structures located on the side of pit with shallower depth increases compared with calculating results without considering two different asymmetric excavation. This enhancing effect of insertion ratio becomes more obvious as the depth of deeper side of the excavation increases. Finally, a case study proved that the analytical solutions can improve the asymmetric excavation pit design method, and provide a useful and economic reference.
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收稿日期 2015-09-18 修回日期  网络版发布日期  
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通讯作者:
作者简介: 徐长节,男,1972年生,博士,教授,博士生导师,主要从事基坑工程方面的研究。
作者Email: xucj@zju.edu.cn

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