超载作用下地表沉降偏态分布模式研究

李元勋; 朱彦鹏; 叶帅华; 马孝瑞

doi:10.11779/CJGE2018S1028

超载作用下地表沉降偏态分布模式研究 English Version

1. 青海大学土木工程学院,青海西宁 810016;
2. 兰州理工大学西部土木工程防灾减灾教育部工程研究中心,甘肃兰州 730050

基金项目: 青海省科技厅项目（2018-ZJ-933Q）; 国家自然科学基金项目（51508256）

详细信息

作者简介:
李元勋(1988- ),男,博士,讲师,主要从事深基坑支护结构及滑坡泥石流研究方面的工作。E-mail：liyuanxun.521@163.com。

中图分类号: TU478
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出版历程
- 收稿日期: 2017-06-10
- 发布日期: 2018-08-24

Skewness distribution patterns of surface settlement considering overload effect

1. School of Civil Engineering, Qinghai University, Xining 810016, China;
2. Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China

摘要

摘要: 地表沉降计算中,如何考虑周边环境影响及确定地表沉降曲线型态是重点问题。现有计算公式大多是在假设坑外没有超载或超载型式单一的前提下得出的,应用范围有限。因此,对不同的超载作用进行等效推导,采用地层损失法原理,建立考虑基坑周边不同超载型式作用下的地表沉降偏态分布曲线预测计算模型,并推导计算公式,以期对地表沉降量得到合理、可靠、更加符合实际的预测计算结果。并结合实际工程,将文中方法与数值分析软件Plaxis-2D模拟计算结果及实测沉降值对比分析。结果表明：超载作用既使地表沉降量有较大的增加,又使最大沉降点位置朝基坑明显移动,计算中正确考虑坑外超载的影响是必要的;另外,文中方法所得结果与实测沉降值吻合较好,计算结果精度较高,对深基坑地表沉降理论计算方法进行了相应的完善,可供类似土质地区及支护结构的工程借鉴参考。
- 超载作用 /
- 地表沉降曲线 /
- 偏态分布 /
- Plaxis-2D
Abstract: How to consider the influences of surrounding environment and determine the patterns of surface settlement curve is the primary problem in the calculation of surface settlement. The existing formulas are mostly obtained under the assumption that the pit is under the premise of no overload or single overload, and their application is limited. Therefore, different effects of the equivalent overloads are derived, and then the prediction model for skewness distribution curve of surface settlement is established considering the surface settlement under different overloading types based on the principles of formation damage method. The relevant formula is derived in order to get reasonable, reliable and satisfactory forecast results of surface settlement. For a practical project, a comparison is made among results by the proposed method, the simulated results of numerical analysis software Plaxis-2D and the measured settlement values. The results show that the effect of overloading is necessary to be considered for the reason that it has induced a greater increase in the surface settlement and also made the maximum settlement point moves significantly toward the foundation pit. In addition, the obtained results are in good agreement with the measured settlement values, and the computational accuracy is higher. The proposed method for surface settlement of deep foundation pits is improved, and it can be helpful for other similar projects.
- overload effect /
- surface settlement curve /
- skewness distribution /
- Plaxis-2D

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参考文献(12)

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