深部巷道围岩分区破裂化的三维光弹试验  

Three Dimensional Photoelastic Test on the Zonal Disintegration Around Deep Roadways-txg

作　　者：胡南燕 刘兰心 黄建彬 付晗 陈敦熙 罗斌玉 HU Nanyan;LIU Lanxin;HUANG Jianbin;FU Han;CHEN Dunxi;LUO Binyu(School of Resource and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources,Wuhan 430081,China)

机构地区：[1]武汉科技大学资源与环境工程学院,武汉430081 [2]冶金矿产资源高效利用与造块湖北省重点实验室,武汉430081

出　　处：《有色金属工程》2023年第3期102-109,共8页Nonferrous Metals Engineering

基　　金：省级大学生创新创业训练计划项目(S202110488008);湖北省重点研发计划项目(2020BCA082)。

摘　　要：为研究深部巷道围岩分区破裂的形成机理,采用三维光弹应力冻结试验法研究深部巷道围岩的应力分布。光弹试验模型在径向约束条件下分别沿巷道轴向施加5、30、50、70和90 kN的荷载,光弹切片直观地呈现分区破裂围岩应力场。结果显示:当轴向应力达到一定水平时,巷道围岩应力分布呈现与巷道同心的完整圆环形,巷道附近围岩应力最大。随着巷道轴向应力的增大,与巷道同心的圆环形应力圈数增多,应力水平提高,且最大应力有远离巷道表面的趋势。研究表明:巷道轴向应力决定了分区破裂产生的破裂圈数,是影响巷道分区破裂的主要因素。随着轴向应力的增大,高地应力“绕过”巷道。三维光弹试验法为分区破裂力学研究带来方法上的进步。研究成果可为巷道围岩稳定性控制提供新的思路,为巷道的开挖和支护设计提供理论基础。In order to research the forming mechanism of zonal disintegration, the stress distribution of surrounding rock in deep roadway was studied through three dimensional photoelastic test with stress freezing.In this work, the loads of 5,30,50,70 and 90 kN were respectively applied to the axes of the roadway based on radial constraint in photoelastic test models, also the stress fields of surrounding rock were transparently presented via observing photoelastic slice.The results show that when the axial stress reaches a certain level, the stress distribution of surrounding rock of roadway is presented as concentric circles of roadway, and the stress shows its maximum near roadway.In addition, the number of stress circles increases and the level of stress improves with increasing axial stress of roadway, and the increased distance between the area of maximum stress and roadway surface can be obtained.Studies show that the range of layered fractures is determined by the magnitude of the axial stress, which is a critical influence on zonal disintegration.Furthermore, high stress ‘bypass’ roadway as the axial loads increases.The method of three dimensional photoelastic test brings methodological progress for the study of zonal disintegration.The research results can provide new ideas for the stability control of surrounding rock, and give a theoretical guidance for the roadway excavation and supporting design.

关 键 词：深部巷道 分区破裂 三维光弹试验 应力分布 应力冻结 

分 类 号：TD322[矿业工程—矿井建设]