考虑岩石流变及应变软化的深部巷道围岩变形理论分析  

A theoretical analysis of surrounding rock deformation of deep soft rock roadway based on rock rheology and strain softening

作　　者：经纬[1,2,3] 郭瑞 杨仁树[4] 经来旺[1,5] 薛维培 JING wei;GUO Rui;YANG Renshu;JING Laiwang;XUE Weipei(State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines,Anhui University of Science and Technology,Huainan,Anhui 232001,China;School of Civil Engineering and Architecture,Anhui Universityof Science Technology,Huainan,Anhui 232001,China;Safety Science and Engineering Postdoctoral Research Mobile Station,Anhui University of Science and Technology,Huainan,Anhui 232001,China;State Key Laboratory for Gieomechanics and Deep Underground Engincering,China University of Mining and Technology,Beijing,Beijing 100083,China;Mine Enginering Mechanics and Support Technology Institutc,Anhui University of Science and Technology,Huainan,Anhui 232001,China)

机构地区：[1]安徽理工大学深部煤矿采动响应与灾害防控国家重点实验室,安徽淮南232001 [2]安徽理工大学土木建筑学院,安徽淮南232001 [3]安徽理工大学安全科学与工程博士后科研流动站,安徽淮南232001 [4]中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室,北京100083 [5]安徽理工大学矿山工程力学与支护技术研究所,安徽淮南232001

出　　处：《采矿与安全工程学报》2021年第3期538-546,共9页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51904012);深部煤矿采动响应与灾害防控国家重点实验室开放基金项目(SKLMRDPC19KF02);安徽省教育厅基金重点项目(KJ2019A0099);安徽省博士后研究人员科研活动经费项目(2018B268);安徽理工大学青年教师科学研究基金重点项目(QN2018104)。

摘　　要：为深入探究岩石流变作用下巷道围岩变形分区机理及弹塑性理论解,基于巷道围岩在流变作用下所能承受的最大应力值应为岩石的长期强度这一重要特性,结合岩体峰后应变软化及扩容特性,推导出巷道围岩四分区应力、位移及半径解析解,并揭示黏聚力软化模量与内摩擦角及初始黏聚力之间的量化关系。通过算例验证该理论的可行性,并分析流变作用下不同围岩力学性质对巷道围岩各分区范围及变形的影响规律。研究表明:围岩流变特性对初始黏聚力的确定有重要影响,考虑流变影响时选取的初始黏聚力与不考虑流变时相比明显偏小;围岩各分区半径随初始黏聚力、内摩擦角增大而减小,因此考虑流变作用时围岩承载能力将明显降低;内摩擦角对围岩各分区范围的影响随着初始黏聚力增大而不断减弱;流变特性对巷道围岩变形的影响随着内摩擦角减小而不断增强。研究成果可为巷道围岩稳定性控制及支护参数量化设计提供理论借鉴。In order to further explore theoretical solution to deformation zoning mechanism and elastic-plastic roadway surrounding rock affected by rock rheology, based on an important characteristic of roadway surrounding rock under rheological action that its maximum stress value should be its long-term strength, and combined with the post-peak strain softening and dilatancy characteristics of rock mass, the analytical solutions of stress, displacement and radius of roadway surrounding rock were derived, and the quantitative relationship between the softening modulus of cohesion and the internal friction angle and initial cohesion of rock was revealed. The feasibility of this theory was verified by an engineering example, and the influence of different mechanical properties of surrounding rock on the range and deformation of the roadway surrounding rock under the action of rheology was analyzed. The results have shown that rheological properties of surrounding rock have an important influence on the determination of initial cohesion: the initial cohesion selected when considering rheological effect is obviously smaller than that without rheological effect. The radius of each zone of surrounding rock decreases with the increase of initial cohesion and internal friction angle, so the bearing capacity of surrounding rock will decrease obviously when rheological action is considered. The influence of internal friction angle on the zoning range of surrounding rock decreases with the increase of initial cohesion, and the influence of rheological properties on roadway surrounding rock deformation increases with the decrease of internal friction angle. The research results can provide theoretical reference for the stability control of roadway surrounding rock and the quantitative design of support parameters.

关 键 词：巷道围岩 流变 变形分区 初始黏聚力 长期强度 四阶段应变软化模型 

分 类 号：TD353[矿业工程—矿井建设]