摘要
针对软岩巷道变形大、难支护等问题,以某煤矿巷道为工程背景,采用FLAC3D软件对巷道支护进行精细化数值模拟。原支护方案模拟结果与现场实际情况吻合较好,说明采用的精细化数值模拟方法和参数较为合理,得到的结果具有较高的可靠度。5个支护优化方案模拟结果的对比分析表明,采用锚注支护时,缩小锚杆间距可有效控制围岩变形,但当锚杆间距达到一定值后,再缩小锚杆间距,支护效果提升不再明显;锚注支护效果优于锚杆支护,可有效控制围岩变形;注浆锚索的支护效果优于注浆锚杆。得到的最优支护方案是:预注浆+全断面锚杆(直径22mm,长度2.4m,间距0.8m,排距1.6m)+全断面注浆锚索(直径22mm,长度6.2m,间距1.0m,排距1.6m),该方案可满足巷道支护要求,支护效果良好。
Aiming at the problems of large deformation and difficult support of soft rock roadway,taking a coal mine roadway as the engineering background,the refined numerical simulation of roadway support was carried out by FLAC3 Dsoftware.The simulation results of the original support scheme are in good agreement with the actual situation,which shows that the refined numerical simulation method and parameters are reasonable,and the obtained results have high reliability.The comparison and analysis on the simulation results of five support optimization schemes show that the deformation of surrounding rock can be effectively controlled by reducing the bolt spacing when the bolt grouting support is adopted,but when the bolt spacing reaches a certain value,the support effect will not be improved obviously by reducing the bolt spacing again.The effect of bolt grouting support is better than that of anchor rod support,because it can effectively control the deformation of surrounding rock.The supporting effect of grouting anchor cable is better than that of grouting bolt.The optimal support scheme is determined as pregrouting+full face bolt(with diameter of 22 mm,length of 2.4 m,spacing of 0.8 m,and row spacing of 1.6 m)+full face grouting anchor cable(with diameter of 22 mm,length of 6.2 m,spacing of 1.0 m,and row spacing of 1.6 m).This scheme can meet the requirements of roadway support and has a good supporting effect.
作者
杨秀章
李秀明
李元振
李为腾
张朔
YANG Xiuzhang;LI Xiuming;LI Yuanzhen;LI Weiteng;ZHANG Shuo(Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention,Shandong University of Science and Technology,Qingdao,Shandong 266590,China)
出处
《矿业研究与开发》
CAS
北大核心
2020年第11期96-100,共5页
Mining Research and Development
基金
国家自然科学基金项目(51604166,41772299)
青岛市博士后应用研究项目(2016130)
山东科技大学土木工程与建筑学院科研创新团队支持计划项目(2019TJKYTD02)。
