岩土工程学报2025，Vol.47Issue(1)：76-84,9.DOI:10.11779/CJGE20231160
基于多切线技术的盾构隧道开挖面稳定性分析
Face stability of shield-driven tunnels using multi-tangent technique
摘要
Abstract
To address the face stability problem of deep-buried tunnels under nonlinear conditions,using Power-Law(P-L)criterion the approximate piecewise and by multi-tangent technique,a novel multi-cone failure mechanism is developed for tunnel faces based on the kinematic limit analysis theorem.A theoretical framework considering the tension cut-off(T-C)is proposed to evaluate the stability of tunnel faces.The reliability of the proposed method is validated through comparison with that in the existing literatures.Based on the back-calculated stress distribution and geometric feature of the failure mechanism,the influences of T-C under different parameters on the stability of tunnel faces are investigated.The results indicate that:(1)under the linear condition,the effects of T-C on the critical support pressure are more significant with high cohesion and small internal friction angle.Under the nonlinear condition,an increase in the nonlinear coefficient will not exacerbate the impact of T-C on the face stability.(2)For higher tensile strength,the effects of T-C on the stability of tunnel faces are significant.As the tensile strength decreases,the failure mechanism governed by T-C gradually shrinks,and the top of the failure mechanism exhibits noticeable blunting and looks like a dome.关键词
开挖面稳定性/多切线技术/Power-Law准则/拉应力截断/极限分析Key words
stability of tunnel face/multi-tangent technique/Power-Law criterion/tension cut-off/limit analysis分类
建筑与水利引用本文复制引用
钟军豪,CHIAN Siau Chen,李永鑫,刘明芳,陈明辉,吴振元,龙桂华,杨小礼,周德..基于多切线技术的盾构隧道开挖面稳定性分析[J].岩土工程学报,2025,47(1):76-84,9.基金项目
国家自然科学基金项目(5210081105) （5210081105）
安徽省自然科学基金项目(2108085QE250) （2108085QE250）
湖南省研究生科研创新项目(CX20220239) （CX20220239）
国家留学基金项目(国家建设高水平大学公派研究生项目) （国家建设高水平大学公派研究生项目）
