Theoretical prediction of ground settlements due to shield tunneling in multi-layered soils considering process parameters

IF 8.2 1区 工程技术 Q1 ENGINEERING, CIVIL
Liqiang Cao , Xiangsheng Chen , Dechun Lu , Dingli Zhang , Dong Su
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引用次数: 0

Abstract

This paper conducts a theoretical analysis of ground settlements due to shield tunneling in multi-layered soils which are usually encountered in urban areas. The proposed theoretical solution which is based on the general form of the Mindlin's solution and Loganathan-Poulos formula can comprehensively consider the in-process tunneling parameters including: unbalanced face pressure, shield-soil friction, unbalanced tail grouting pressure, unbalanced secondary grouting pressure, overloading during tunneling and the ground volume loss. The method is verified by comparing with the field data from the Qinghuayuan Tunnel Project in terms of the ground surface settlements along the longitudinal and transverse direction. Due to the local settlement or heave caused by the certain tunneling parameters, the ground surface settlements calculated using current solution along the longitudinal direction presents an irregular S-shaped curve instead of the traditional S-shaped curve. Results also find that the effect of the unbalanced secondary grouting pressure and the overloading during tunneling cannot be ignored.

考虑工艺参数的多层土壤中盾构掘进引起的地面沉降理论预测
本文对城市地区常见的多层土壤中盾构掘进引起的地面沉降进行了理论分析。所提出的理论解法基于 Mindlin 解法的一般形式和 Loganathan-Poulos 公式,可综合考虑掘进过程中的各种参数,包括:不平衡工作面压力、盾构与土体摩擦、不平衡尾部注浆压力、不平衡二次注浆压力、掘进过程中的超载以及地面体积损失。该方法通过与清华园隧道工程的现场数据进行对比,从纵向和横向的地表沉降方面进行了验证。由于特定的隧道参数会引起局部沉降或隆起,采用当前方案计算的地表沉降沿纵向呈不规则的 S 形曲线,而非传统的 S 形曲线。结果还发现,隧道掘进过程中不平衡的二次注浆压力和超载的影响不容忽视。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Underground Space
Underground Space ENGINEERING, CIVIL-
CiteScore
10.20
自引率
14.10%
发文量
71
审稿时长
63 days
期刊介绍: Underground Space is an open access international journal without article processing charges (APC) committed to serving as a scientific forum for researchers and practitioners in the field of underground engineering. The journal welcomes manuscripts that deal with original theories, methods, technologies, and important applications throughout the life-cycle of underground projects, including planning, design, operation and maintenance, disaster prevention, and demolition. The journal is particularly interested in manuscripts related to the latest development of smart underground engineering from the perspectives of resilience, resources saving, environmental friendliness, humanity, and artificial intelligence. The manuscripts are expected to have significant innovation and potential impact in the field of underground engineering, and should have clear association with or application in underground projects.
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