岩土工程学报2011，Vol.33Issue(1)：57-62,6.
盾构隧道开挖面稳定极限理论研究
Limit theoretical study on face stability of shield tunnels
摘要
Abstract
Based on the limit equilibrium of Murayama and the upper bound limit analysis method, the face stability of shield tunnels is studied. Formulas for calculating the least support pressure at collapse are deduced. Analogous to Terzaghi's superposition method commonly used in bearing capacity analysis, the least support pressure is expressed by the summation of the cohesion c, surcharge load q and gravity y multiplied by the corresponding influence numbers Nc, Nq, Nγ In the limit equilibrium, Nc increases with the increase of the friction angle and the decrease of the ratio of tunnel depth C to diameter D, Nq and Nγ decrease with the increase of the friction angle Nq decreases and Nγ increases with the increasing value of C/D. In the upper bound limit analysis, the three stability numbers show the same trends only when the friction angle is less than an appropriate value which depends on C/D; otherwise Nc and Nγ keep constant, and Nq turns to be zero for any value of C/D. The three stability numbers obtained from the upper bound limit analysis are less than the results of the limit equilibrium and fit to the results obtained by the FE numerical simulation in the literatures.关键词
盾构隧道/开挖面稳定/支护压力/极限平衡/极限上限分析Key words
shield tunnel/ face stability/ support pressure/ limit equilibrium/ upper bound limit analysis分类
建筑与水利引用本文复制引用
吕玺琳,王浩然,黄茂松..盾构隧道开挖面稳定极限理论研究[J].岩土工程学报,2011,33(1):57-62,6.基金项目
国家自然科学基金青年科学基金项目(50908171) （50908171）
国家杰出青年科学基金项目(50825803) （50825803）
上海市学科带头人计划项目(09XD1403900) （09XD1403900）
