Limit analysis of supporting pressure in tunnels with regard to surface settlement  

作　　者：杨小礼 覃长兵 

机构地区：[1]School of Civil Engineering, Central South University [2]College of Civil Engineering, Fujian University of Technology

出　　处：《Journal of Central South University》2015年第1期303-309,共7页中南大学学报（英文版）

基　　金：Project(2013CB036004)supported by the National Basic Research Program of China;Projects(51178468,51378510)supported by the National Natural Science Foundation of China

摘　　要：The proliferation of Hoek-Brown nonlinear failure criterion and upper bound theorem makes it possible to evaluate the stability of circular tunnels with an original curved collapsing mechanism. The arch effect of shallow circle tunnel is not taken into consideration so that the mechanical characteristics can be easily described. Based on the mechanism, the upper bound solution of supporting pressure of tunnels under the condition of surface settlements and overloads on the ground surface is derived. The objective function is formed from virtual work equations under the variational principle, and solutions are presented by the optimum theory. Comparisons with previous works are made. The numerical results of the present method show great agreement with those of existing ones. With regard to the surface settlement and overloads, the influence of different rock parameters on the collapsing shape is analyzed.The proliferation of Hoek-Brown nonlinear failure criterion and upper bound theorem makes it possible to evaluate the stability of circular tunnels with an original curved collapsing mechanism. The arch effect of shallow circle tunnel is not taken into consideration so that the mechanical characteristics can be easily described. Based on the mechanism, the upper bound solution of supporting pressure of tunnels under the condition of surface settlements and overloads on the ground surface is derived. The objective function is formed from virtual work equations under the variational principle, and solutions are presented by the optimum theory. Comparisons with previous works are made. The numerical results of the present method show great agreement with those of existing ones. With regard to the surface settlement and overloads, the influence of different rock parameters on the collapsing shape is analyzed.

关 键 词：circular tunnel Hoek-Brown criterion collapse mechanism surface settlement 

分 类 号：U451[建筑科学—桥梁与隧道工程] U455.7[交通运输工程—道路与铁道工程]