浅埋隧道塌方机理上限分析  

Upper bound limit analysis of collapse mechanisms of the shallow tunnel

作　　者：严若明 周光裕 唐金 杨小礼[1] 

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]湖南路桥建设集团公司.湖南长沙410004

出　　处：《铁道科学与工程学报》2014年第5期96-99,共4页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51178468)

摘　　要：对浅埋圆形隧道的塌方机制的预测是一项极为复杂的工作。基于Hoek-Brown破坏准则下,运用极限分析原理,对浅埋圆形隧道的破坏机制进行分析。在考虑支护力和孔隙水压力的前提下,对岩体内部进行能量耗散计算分析。推导出塌落面目标方程的参数表达形式。代入不同的参数值,绘制出具体的塌落面形状。分析讨论各参数对潜在的塌落形式的影响。研究结果表明:孔隙水压力系数ru和参数B增大,塌方范围减小;参数A和σt增大,塌方范围增大。The prediction of the collapse mechanism in shallow circular tunnel is one of the most difficult tasks. Based on Hoek-Brown failure criterion and within the framework of upper bound theorem,the collapse mecha-nism of shallow circular tunnel was discussed in this paper.With the consideration of supporting pressure and pore water pressure,the energy dissipation of internal rock was calculated and analyzed,and the parameter ex-pression of the objective function of collapse surface was derived.Thereafter,the specific shape of collapse sur-face was plotted with different parameter values,and parametric study was conducted to estimate the effect of ev-ery parameter on the potential collapse mechanism.The results indicate that,with the increase of pore water pressure coefficient ru and parameter B,the scope of collapsing block decreases.However,with the increasing magnitude of parameters A and σt,the range of detaching block tend to increase.

关 键 词：浅埋隧道 破坏机理 极限分析 HOEK-BROWN准则 

分 类 号：TU921[建筑科学—建筑设计及理论]