基于广义张-朱强度准则的深埋隧道围岩塑性分析及应用探讨  

An elasto-plastic analysis of a deep buried tunnel in rock mass based on generalized Zhang-Zhu strength criterion and preliminary application

作　　者：王永红[1] 杜文 张国辉 宋扬 WANG Yong-hong;DU Wen;ZHANG Guo-hui;SONG Yang(Key Laboratory of Urban Underground Engineering of the Education Ministry,Beijing Jiaotong University,Beijing 100044,China;The 5th Engineering Corporation,China Railway 19th Bureau Group Co.,Ltd.,Dalian,Liaoning 116100,China)

机构地区：[1]北京交通大学城市地下工程教育部重点实验室,北京100044 [2]中铁十九局集团第五工程有限公司,辽宁大连116100

出　　处：《岩土力学》2022年第3期819-830,共12页Rock and Soil Mechanics

基　　金：国家自然科学基金项目(No.51478037);中国工程院重大咨询项目(No.TM201503)。

摘　　要：深埋隧道是交通建设中关键性和控制性的工程,近几年得到了迅速和蓬勃的发展。目前,深埋隧道围岩塑性分析,多采用Hoek-Brown强度准则,该准则只考虑了最大、最小主应力对围岩屈服的影响,与深埋隧道围岩三向受力的特征不符。根据Lee和Pietruszczak提出的递推计算方法,对围岩服从广义张-朱(generalized Zhang-Zhu strength criterion,简称GZZ)强度准则时的变形及周边应力分布进行了研究。发现当采用GZZ强度准则时,深埋隧洞洞壁位移、塑性半径明显减小,塑性区径向应力、环向应力均增大;中主应力系数增大,隧洞周边应力进一步提高。上述解法与引入面外应力解法相比,洞壁位移减小了26.6%,但塑性半径相差不大。应用GZZ强度准则计算了建平隧道围岩变形控制值,解决对深埋隧道围岩变形控制值认识模糊和无法有效判定的问题;继而改进开挖方案,有效提高了Ⅳ、Ⅴ围岩的掘进速度,实现了建平隧道安全快速的施工,获得了良好的工程效果。The deep buried tunnels are the fundamental and dominating projects in the implementation of transportation routes, they have been developing rapidly and vigorously in the last decade. At present, the failure criterion of rock mass adopted in the elasto-plastic analysis of a circular opening is the Hoek–Brown strength criterion, in which only the maximum and minimum principal stress are considered. Obviously, the Hoek-Brown strength criterion is not compatible with the rock mass of a deep buried tunnel which bears high-level three-dimensional geostresses. On the basis of numerical procedure proposed by Lee and Pietruszczak,the deformation and stresses considering the generalized Zhang-Zhu strength criterion(GZZ) of rock mass around a circular opening are analyzed in this paper. It is found that the tunnel wall displacement and plastic radius are reduced, and both of the radical stress and hoop stress in the plastic zone are increased. It is also proved that a greater intermediate principal stress coefficient leads to higher stresses. Compared to another approach, theoretical solutions considering the effect of out-of-plane stress, the tunnel wall displacement calculated by GZZ strength criterion is reduced by 26.6% and the plastic radii are approximately the same. Finally, the GZZ strength criterion is applied as a practical approach to estimate the critical tunnel wall displacements of Jianping tunnel, then the triple bench cut method is modified to improve the advance rates of type Ⅳ and type Ⅴ rock mass, the safe and efficient cut of Jianping tunnel is achieved with outstanding engineering performance.

关 键 词：深埋隧道 GZZ强度准则 应变软化围岩 安全快速施工 

分 类 号：TU451[建筑科学—岩土工程]