基于西原模型的非等压圆形硐室黏塑性区理论分析  

Theoretical Analysis of Viscoplastic Zone of Non-axisymmetric Circular Chamber Based on Nishihara Model

作　　者：郭建强 袁超 林彬 徐越洋 吴俊杰 杜荣杰 GUO Jianqiang;YUAN Chao;LIN Bin;XU Yueyang;WU Junjie;DU Rongjie(School of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;The Second Engineering Co.,Ltd.of China Railway,The Fifth Bureau Group,Hengyang 421200,China)

机构地区：[1]湖南科技大学资源环境与安全工程学院,湖南湘潭411201 [2]中铁五局集团第二工程有限责任公司,湖南衡阳421200

出　　处：《矿业工程研究》2023年第1期23-28,共6页Mineral Engineering Research

基　　金：国家自然科学基金资助项目(52274080);湖南省自然科学基金青年基金资助项目(2021JJ40211);湖南省教育厅优秀青年基金资助项目(21B0486)。

摘　　要：以Mohr-Coulomb强度准则和西原流变模型为基础,推导出非等压原岩应力情况下的圆形硐室黏塑性区边界方程.分析不同侧压力系数与支护阻力条件下,硐室黏塑性区半径随时间的变化规律,探讨硐室围岩卸荷初期和围岩流变期间的塑性区差异性.研究发现:硐室围岩卸荷初期,黏塑性区半径增长率较高,且其增长率随时间的增加而逐渐减小;当时间增加到一定程度后,黏塑性区半径不再增大而是稳定在某一固定值;黏塑性区半径随侧压力系数增大而增大,同一时刻下,侧压力系数越大,黏塑性区半径增长率越小;支护阻力对硐室围岩卸荷初期和围岩流变期间的黏塑性区半径有抑制作用,且抑制作用随支护阻力的增大而逐渐增强.Based on the Mohr-Coulomb strength criterion and Nishihara rheological model,the boundary equation of the viscoplastic zone of circular chamber under stress of non-isobaric rock is derived.The variation of the viscoplastic zone radius of the chamber viscoplastic zone with time under the conditions of pressure coefficient and supporting resistance on different sides is analyzed,and the difference between the plastic zone in the early stage of unloading and the rheological period of the surrounding rock is discussed.It is found that the growth rate of the radius of the viscoplastic zone is high in the early stage of unloading of the surrounding rock,and the growth rate gradually decreases with the increase of time.After the time increases to a certain extent,the radius of the viscoplastic zone no longer increases,but stabilizes at a fixed value.The radius of the viscoplastic zone increases with the increase of the pressure coefficient on the side.At the same time,the larger the lateral pressure coefficient,the smaller the growth rate of the radius of the viscoplastic zone.The supporting resistance has an inhibitory effect on the viscoplastic zone radius of the surrounding rock in the early stage of unloading and the rheological period of the surrounding rock,and the inhibitory effect gradually increases with the increase othe supporting resistance.

关 键 词：西原模型 黏塑性区 边界方程 侧压力系数 支护阻力 

分 类 号：TD354[矿业工程—矿井建设]