期刊信息
主管单位:国家教育部
主办单位:重庆大学
主  编:
地  址:重庆市沙坪坝正街174号
邮政编码:400030
电  话:023-65102302
电子邮件:xbsg@cqu.edu.cn
国际标准刊号:ISSN 1000-582X
国内统一刊号:CN 50-1044/N
邮发代号:国内78-16 国外 M355
引用本文:
【打印本页】   【HTML】   【下载PDF全文】   查看/发表评论  下载PDF阅读器  关闭
←前一篇|后一篇→ EndNote   BibTeX  过刊浏览    高级检索
本文已被:浏览 2279次   下载 1118 本文二维码信息
码上扫一扫!
分享到: 微信 更多
高应力岩石局部化变形与隧道围岩灾变破坏过程
赵瑜,张春文,刘新荣,陈陆望
1.重庆大学 土木工程学院,山地城镇建设与新技术教育部重点实验室,重庆 400045;2.合肥工业大学 资源与环境工程学院,安徽 合肥,230009
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。
关键词:  应变局部化  破坏过程  高地应力
DOI:10.11835/j.issn.1000-582X.2011.04.019
分类号:
基金项目:国家自然科学基金资助项目(50621403;50804060);教育部新世纪人才支持计划资助项目(NCET-09-0844)
Study on strain localization and progressive failureof surrounding rock under high pressure environment
ZHAO Yu1, ZHANG Chun-wen1, LIU Xing-rong1, CHEN Lu-wang2,3
1.College of Civil Enginering,Key Laboratory of New Technology for Construction of Cities in Mountaion Area, Ministry of Education, Chongqing University,Chongqing 400045 P.R.China;2.School of Resources and Environmental Engineering;3.Hefei University of Technology, Hefei 230009 Anhui,P.R.China
Abstract:
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.
Key words:  strain localization  progressive failure  high geostress
Copyright@ 2008 All Rights Reserved.