| 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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| 引用本文： | 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(Z1):57-67. |
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| 作者姓名： | 张治国 蒋康明 王志伟 邢李 魏纲 丁智 |
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| 作者单位： | (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) |
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| 基金项目： | 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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| 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。
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| 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 |
Theoretical Analysis on Longitudinal Deformation of
Existing TunnelInduced
by Adjacent Foundation Pit Excavation Considering Pasternak
Foundation Model |
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| ZHANG Zhiguo,JIANG Kangming,WANG Zhiwei,XING Li,WEI Gang,DING Zhi.Theoretical Analysis on Longitudinal Deformation of
Existing TunnelInduced
by Adjacent Foundation Pit Excavation Considering Pasternak
Foundation Model[J].Tunnel Construction,2020,40(Z1):57-67. |
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| Authors: | ZHANG Zhiguo JIANG Kangming WANG Zhiwei XING Li WEI Gang DING Zhi |
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| Institution: | (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) |
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| 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. |
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