考虑剪胀和软化的巷道围岩弹塑性分析  

Elastic-Plastic Analysis of Surrounding Rocks Considering Material Dilatancy and Softening

作　　者：魏建军[1,2] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008 [2]江苏建筑职业技术学院江苏省建筑安全与减灾工程研发中心,江苏徐州221116

出　　处：《土木建筑与环境工程》2013年第3期7-11,共5页Journal of Civil,Architectural & Environment Engineering

基　　金：国家自然科学基金(51174196);江苏省教育厅高校科研成果产业化推进项目(JHB2011-66;JHB2012-69);江苏省高校青蓝工程资助

摘　　要：在应力跌落模型的基础上引进软化阈值,建立了弹塑脆性模型,模拟岩土材料的脆性软化性质。基于Mohr-Coulomb准则,考虑了岩土材料屈服后的塑性软化和体积膨胀,推导了圆形巷道围岩的软化区半径、塑性区半径、洞周位移及围岩内应力表达式,最后通过算例分析了剪胀、软化程度和弹模劣化对破裂区范围的影响,为巷道的稳定分析以及支护设计提供理论依据。Based on stress dropping model, an elastoplastic-brittle model was established by using a softening threshold value to model the features of the geotechnical materials. According to the Mohr- Coulomb criterion, the radius of the rupture and plastic zone, the displacement and stress expressions of surrounding rock were obtained with the consideration of the strain-softening and dilatancy of geotechnical materials. Furthermore, the model was verified by case study and the influence of strain-softening, dilatancy and elastic modulus deterioration on calculation result were presented.

关 键 词：巷道 弹塑性 剪胀 软化 解析解 

分 类 号：TU451.2[建筑科学—岩土工程]