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隧道建设(中英文) ›› 2020, Vol. 40 ›› Issue (S1): 57-67.DOI: 10.3973/j.issn.2096-4498.2020.S1.008
张治国1, 2, 3, 蒋康明1, 王志伟2, 邢李1, 魏纲3, 丁智3
Theoretical Analysis on Longitudinal Deformation of Existing Tunnel Induced by Adjacent Foundation Pit Excavation Considering Pasternak Foundation Model
ZHANG Zhiguo1, 2, 3, JIANG Kangming1, WANG Zhiwei2, XING Li1, WEI Gang3, DING Zhi3
(1. School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093,
China; 2. State Key Laboratory for Track Technology of Highspeed 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)
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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