爆破扰动对巷道围岩损伤的数值模拟  

Numerical simulation of surrounding rock damage in roadway under high stress blasting disturbance

作　　者：龙翼 雷刚[1] 陈治洋[1] 李元辉 徐世达[1] LONG Yi;LEI Gang;CHEN Zhiyang;LI Yuanhui;XU Shida(Key Laboratory of Ministry of Education for the Safe Mining of Deep Metal Mines,Northeastern University,Shenyang 110819,China;Zijin Mining Group Co.,Ltd.,Shanghang 364200,China)

机构地区：[1]东北大学深部金属矿山安全开采教育部重点实验室,辽宁沈阳110819 [2]紫金矿业集团股份有限公司,福建上杭364200

出　　处：《中国矿业》2020年第11期118-124,共7页China Mining Magazine

基　　金：国家重点研发计划项目资助(编号:2018YFC0604601,2016YFC0801605);国家自然科学基金项目资助(编号:51704056,51974059);中央高校基本科研业务费专项基金项目资助(编号:N160103006,N180115010);中国博士后基金项目资助(编号:2017M621152)。

摘　　要：深部巷道围岩在频繁爆破扰动作用下微裂隙不断产生、扩展与贯通,形成宏观破裂,岩体失稳灾害日益突出。本文采用FLAC 3D软件,考虑不同侧压力系数,开展高应力爆破扰动条件下巷道围岩损伤规律研究。结果表明:应力环境明显影响巷道围岩的损伤特征。初始应力条件决定巷道围岩的破坏区域和破坏形态分布,爆破扰动会加剧巷道围岩的损伤,加快破坏速度。与初始应力状态相比,爆破扰动造成巷道围岩松弛区变厚、应力集中程度和影响范围增大,同时改变围岩中位移的分布特征和范围,并增大围岩的最大位移量。巷道围岩所受双向载荷差值越大,爆破扰动作用后塑性区的深度就越深,破坏增量也越大,巷道围岩塑性区的范围远大于松弛区。支护工程应控制松弛区围岩,避免其发生垮落。研究为深部巷道围岩控制提供支撑。Under the action of frequent blasting disturbance,the micro-cracks in the deep roadway surrounding rocks are constantly generated,expanded and penetrated,forming macro-fractures,and the rock mass instability disaster is becoming increasingly prominent.In this paper,the FLAC 3D software is used to study the damage law of the surrounding rock under the condition of high stress blast disturbance,considering different pressure coefficients.The results show that the stress environment obviously affects the damage characteristics of the surrounding rock of the roadway.The initial stress conditions determine the damage area and the shape distribution of the surrounding rock of the roadway.The blasting disturbance will aggravate the damage of the surrounding rock of the roadway and accelerate the destruction speed.Compared with the initial stress state,the blasting disturbance causes the surrounding rock in the roadway to be loosened,the stress concentration and the scope of influence are increased.At the same time,the distribution form and range of displacement in the surrounding rock are changed,and the maximum displacement in the surrounding rock is increased.The greater the difference between the two-way load on the surrounding rock of the roadway,the deeper the plastic zone after the blasting action is used,and the greater the damage increase.The range of the plastic zone of the roadway surrounding rock is much larger than the relaxation zone.The support engineering should control the surrounding rocks in the slack zone to avoid collapse.The study provides support for surrounding rock control in deep roadways.

关 键 词：高应力 爆破扰动 巷道围岩 损伤规律 数值模拟 

分 类 号：TD235[矿业工程—矿井建设]