深部硐室群巷道围岩变形机理及控制技术研究  

Mechanism and control of surrounding rock deformation of deep chamber group roadway

作　　者：傅航 马宏发 宋彦琦[1] FU Hang;MA Hong-fa;SONG Yan-qi(China University of Mining and Technology(Beijing),Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083

出　　处：《煤炭工程》2021年第12期49-54,共6页Coal Engineering

基　　金：国家自然科学基金联合基金资助项目(U1704242);中国矿业大学(北京)中央高校基本科研业务费专项资金(2021YJSLJ21)。

摘　　要：针对陈四楼煤矿深部硐室群巷道围岩变形量大、难支护等问题,通过现场取样,测得硐室群围岩物理力学参数,依据松动圈理论计算出松动圈大小为2.63~3.11m,大于锚杆长度,表明锚杆无法满足支护需求;并利用FLAC^(3D)软件进一步研究了硐室巷道开挖后巷道围岩应力分布及变形特征,分析了硐室群巷道围岩变形破坏机理,表明地应力复杂、支护强度不足、底板未支护是造成围岩变形破坏的主因。基于理论分析和数值模拟提出采用“锚网索注浆加固组合控制技术”对巷道顶底板围岩进行加固,数值模拟结果显示:巷道围岩变形得到了有效控制,顶板最大变形量为30mm;现场监测结果显示:180d内顶板最大变形量为30mm,达到了理想加固支护效果。Aiming at the large deformation and difficult support of surrounding rock of deep chamber group roadway in coal mine,the physical and mechanical parameters of the surrounding rock are tested after field sampling.According to the loose circle theory,the size of the loose circle is 2.63~3.11m,which is larger than the length of the bolt,indicating that the bolt can not meet the support requirements.The stress distribution and deformation characteristics of surrounding rock after excavation are further studied using FLAC^(3D),the deformation and failure mechanism of surrounding rock is analyzed.The results show that complex in-situ stress,insufficient support strength and unsupported floor are the main causes for deformation and failure of surrounding rock.Based on the theoretical analysis and numerical simulation,the combined control technology of bolt mesh cable grouting reinforcement is applied to reinforce the surrounding rock of roadway roof and floor.The numerical simulation results show that the deformation of roadway surrounding rock is controlled,and the maximum deformation of roof is 30mm.The field monitoring results show that the maximum roof deformation is 30mm within 180 days,the reinforcement effect is favorable.

关 键 词：深部硐室群 变形机理 松动圈理论 数值模拟 

分 类 号：TD353[矿业工程—矿井建设]