岩土工程学报2013，Vol.35Issue(6)：1092-1101,10.
超载作用下软土盾构隧道横向变形机理及控制指标研究
Mechanism of transverse deformation and assessment index for shield tunnels in soft clay under surface surcharge
摘要
Abstract
The transverse deformation of shield tunnels may ultimately threaten the safety of tunnel structure.The surcharge above the tunnels is one of the leading factor to cause their transverse deformation.The evolution of transverse defromation of the tunnels under surchage is firstly studied using numerical simulation considering the effect of the elastic resistance of surrounding soil and lateral coefficient of earth pressure at rest.It is found that the development of joint opening and the stress states of both tunnel concrete and bolts are dependent on the variation of tunnel diameter.Thus,the variation of tunnel diameter can be taken as the assessment index to predict the performance of shield tunnels in soft soils.The criteria for tunnel assessment are determined in terms of diameter change.Then,a geometry-based simple method is proposed to study the relationship between joint opening and tunnel squating based on the tunnel crown settlement.The method is verified by the abovementioned numerical simulation.This simple method provides a very convenient way to estimate the safety state of shield tunnels.关键词
软土/盾构隧道/横向变形/结构安全Key words
soft clay/ shield tunnel/ transverse deformation/ structural safety分类
建筑与水利引用本文复制引用
王如路,张冬梅..超载作用下软土盾构隧道横向变形机理及控制指标研究[J].岩土工程学报,2013,35(6):1092-1101,10.基金项目
国家自然科学基金项目(51278379) （51278379）
国家重点基础研究发展计划(973计划)项目(2011CB013800) （973计划）
长江学者和创新团队发展计划资助项目(IRT1029) （IRT1029）
