基于虚拟力法的盾构隧道施工扰动地层附加应力分析

张治国; 黄茂松; 王卫东

doi:10.11779/CJGE201407007

基于虚拟力法的盾构隧道施工扰动地层附加应力分析 English Version

张治国^{1, 2, 3},
黄茂松²,
王卫东⁴

1. 上海理工大学环境与建筑学院,上海 200093; 2. 同济大学岩土及地下工程教育部重点实验室,上海 200092; 3. 中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州 221116; 4. 华东建筑设计研究院有限公司,上海 200002

基金项目: 国家自然科学基金项目（51008188）; 同济大学岩土及地下工程教育部重点实验室基金项目（KLE-TJGE-B1302）; 中国矿业大学深部岩土力学与地下工程国家重点实验室基金项目（SKLGDUEK1205）

详细信息

作者简介:
张治国(1978- ),男,河北秦皇岛人,博士后,副教授,硕士生导师,主要从事城市地下工程施工对周围环境影响控制等方面的教学与研究工作。E-mail: zgzhang@usst.edu.cn。

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出版历程
- 收稿日期: 2013-09-04
- 发布日期: 2014-07-24

Additional stresses of disturbed soils induced by shield tunneling based on fictitious force method

1. School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China; 4. East China Architecture Design Institute, Shanghai 200002, China

摘要

摘要: 目前针对盾构隧道掘进引起周围地层附加应力的研究较少,且既有成果一般均假定施工场地为均质土体。基于层状地基基本解,结合虚拟力法,建立了考虑分层效应的盾构隧道施工扰动地层附加应力的分析方法,重点研究了盾构施工正面附加推力、盾构与土体间掘进摩擦力引起的地层附加应力。结合上海典型分层地基工程实例,分析了盾构施工引起的附加应力分布规律,且与均质土体工况下的计算结果进行了对比研究,考察了地基分层效应对扰动地层应力场的影响。计算结果表明：盾构与土体间掘进摩擦力与正面附加推力引起的土体附加应力分布规律较为相似,靠近开挖面时附加应力衰减较快且影响范围一般较小,而远离开挖面时应力衰减明显变慢,在实际工程中要重视掘进摩擦力和正面附加推力造成的施工风险;此外,考虑分层效应与常规不考虑分层效应时的附加应力场有较大差别,在设计中应重视地基非均质性带来的影响。成果可为合理制定层状地基中盾构隧道施工对临近管道以及建筑物的保护措施提供一定的理论依据。
- 盾构隧道 /
- 分层效应 /
- 施工扰动 /
- 掘进摩擦力 /
- 附加应力 /
- 虚拟力法
Abstract: The current researchers pay little attention to the additional stresses of disturbed soils caused by shield tunneling, and all the existing results are based on the assumption of homogenous soils. A theoretical approach, combined with the fictitious force method based on the basic solution for layered foundation, is proposed to analyze the additional stresses of disturbed soils induced by shield tunneling considering the layered effects. The additional stresses induced by the bulkhead additional pressure and the propulsion friction force between the shield machines and the surrounding soils are emphasized. A tunneling case in Shanghai for layered foundation is employed to analyze the distribution rules of the additional stresses caused by tunneling. Furthermore, the comparative researches with a case of homogenous soils are also conducted to study the effects of layered characteristics on disturbance stress field. The results show that the distribution rules of the additional stresses caused by the propulsion friction force are similar to those induced by the bulkhead additional pressure. The additional stresses attenuate quickly in the region close to excavation opening, and the influence sphere is generally small. The additional stresses attenuate slowly in the region away from excavation opening. The construction risk due to the friction force and bulkhead additional pressure should be highlighted. In addition, there are great differences in the characteristics of the stress fields with and without considering the layered effects. Therefore, the influence of non-homogenous soils should not be ignored in the design. It may provide a certain basis for correct preparation of protective measures of adjacent pipelines and buildings induced by shield tunneling in layered soils.
- shield tunneling /
- layered effect /
- disturbance /
- propulsion friction force /
- additional stress /
- fictitious force method

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参考文献(20)

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