考虑Pasternak地基模型的基坑开挖诱发既有隧道纵向变形理论分析

张治国, 蒋康明, 王志伟, 邢李, 魏纲, 丁智

doi:10.3973/j.issn.2096-4498.2020.S1.008

隧道建设 >

2020 , Vol. 40 >Issue S1: 57 - 67

DOI: https://doi.org/10.3973/j.issn.2096-4498.2020.S1.008

研究与探索

考虑Pasternak地基模型的基坑开挖诱发既有隧道纵向变形理论分析

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(1. 上海理工大学环境与建筑学院，上海 200093； 2. 中国铁道科学研究院铁道建筑研究所高速铁路轨道技术国家重点实验室，北京 100081； 3. 浙大城市学院土木工程系，浙江杭州 310015)

张治国(1978—)，男，河北秦皇岛人，2001年毕业于武汉理工大学，交通土建工程专业，博士后，副教授，主要从事地下工程施工对周边环境影响控制方面的研究工作。E-mail： zgzhang@usst.edu.cn。

网络出版日期: 2020-09-16

基金资助

国家自然科学基金项目(41772331，41977247)；高速铁路轨道技术国家重点实验室课题(2018YJ181)

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Theoretical Analysis on Longitudinal Deformation of Existing Tunnel Induced by Adjacent Foundation Pit Excavation Considering Pasternak Foundation Model

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(1. School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, 
China; 2. State Key Laboratory for Track Technology of Highspeed Railway, Railway Engineering Research 
Institute, China Academy of Railway Sciences, Ministry of Land and Resources, Beijing 100081, China;  3. Department of Civil Engineering, Zhejiang University City College, Hangzhou 310015, Zhejiang, China)

Online published: 2020-09-16

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摘要

邻近隧道进行基坑开挖会破坏周围土体平衡状态，引起既有隧道结构不均匀沉降，最终将对隧道安全运营产生不利影响。为控制基坑开挖所导致的既有隧道纵向变形，基于Pasternak地基模型提出双基坑开挖引起邻近既有隧道纵向变形影响的两阶段简化分析方法，分析软土中双基坑开挖对隧道竖向沉降的影响。对比简化理论计算与三维有限元数值模拟，结果吻合较好，由此可得：该简化解析法精度较高并且计算简便。此外，针对基坑侧壁与隧道轴线距离、基坑开挖深度和基坑间距等不同工况，分析双基坑平行隧道、双基坑垂直隧道、双基坑斜交隧道3种布置情况下双基坑开挖对邻近隧道竖向变形的影响，分析结果反映了隧道变形的规律。

关键词： Pasternak地基模型; 双基坑开挖; 既有隧道; 纵向变形; 两阶段分析方法; 数值模拟

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张治国, 蒋康明, 王志伟, 邢李, 魏纲, 丁智 . 考虑Pasternak地基模型的基坑开挖诱发既有隧道纵向变形理论分析[J]. 隧道建设, 2020 , 40(S1) : 57 -67 . DOI: 10.3973/j.issn.2096-4498.2020.S1.008

Abstract

The excavation of foundation pit excavation adjacent to existing tunnel will result in the damage of surrounding soil balance, which would lead to uneven settlement of adjacent tunnel structure, and eventually affect the safe operation of existing tunnel. In order to control the longitudinal deformation of existing tunnel caused by foundation pit excavation, a twostage method based on the Pasternak foundation model is adopted to study the longitudinal deformation of adjacent existing tunnel induced by double foundation pit excavation in soft soil. The results of the simplified theoretical calculation are compared with that of threedimensional finite element numerical simulation, and the comparison results show that the results by the two method coinside with each other well, thus it can be concluded that the simplified analytical method is of high accuracy and simple calculation. In addition, according to the distance between the foundation pit and the tunnel axis, the depth of excavation and the spacing of the foundation pit, the influence of double foundation pit excavation on vertical deformation of adjacent tunnel is analyzed under 3 layouts of double foundation pit parallel to tunnel, double foundation pit vertical to tunnel and double foundation pit oblique to tunnel. The analysis results reflect the law of tunnel deformation.

Key words： Pasternak foundation model; double foundation pit excavation; existing tunnel; longitudinal deformation; twostage analysis method; numerical simulation

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