高应力岩石局部化变形与隧道围岩灾变破坏过程  

Study on strain localization and progressive failure of surrounding rock under high pressure environment

作　　者：赵瑜[1,2] 张春文[1,2] 刘新荣[1,2] 陈陆望[3] 

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045 [3]合肥工业大学资源与环境工程学院,安徽合肥230009

出　　处：《重庆大学学报（自然科学版）》2011年第4期100-106,共7页Journal of Chongqing University

基　　金：国家自然科学基金资助项目(5062140350804060);教育部新世纪人才支持计划资助项目(NCET-09-0844)

摘　　要：为了研究深埋隧道围岩变形局部化与渐进破坏现象,运用FLAC3D三维显式有限差分法分析软件,基于摩尔-库仑剪破坏与拉破坏复合的应变软化模型,采用大变形的计算方法,研究了岩石试件在单轴压缩状态下局部化现象启动、发展直至试件最终破坏的全过程,进一步结合隧道物理模型试验,探讨了高应力条件下隧道围岩变形局部化与渐进破坏的关系,发现岩石材料表现出的软化性状与剪切带形成的结构软化有着密切的联系,从围岩屈服区和软化带的分布规律找到高地应力隧道围岩渐进破坏的突破口,并指出岩体单元的弹性变形和单元屈服后岩体的塑性挤出是隧道开挖后收敛变形的主要原因。This paper uses the Mohr-Coulomb criterion with tension cut-off strain-softening model and the large-strain calculation method to study the localized deformation and progressive failure.It investigates the process of stain localization appearing,growing and sample failure,and uses the physical and numerical simulation to explore the relationship between strain localization and progressive failure of surrounding rock.The results show that the soften character of rock sample is caused by stain localization.The breach point of progressive failure is founded based on the distribution law of plastic zones and soften strips.The key causes of the tunnel convergence deformation after opening are the plastic extrusion and the elastic deformation of rock yield units caused by stress release.

关 键 词：应变局部化 破坏过程 高地应力 

分 类 号：TU443[建筑科学—岩土工程]