基于Flac^(3D)的复杂采空区稳定性分析  

Stability analysis of complex goaf based on Flac^(3D)

作　　者：王伟[1] Wang Wei(China National Gold Group Co.,Ltd.)

机构地区：[1]中国黄金集团有限公司

出　　处：《黄金》2021年第6期41-46,共6页Gold

摘　　要：为研究复杂采空区的稳定性,开展工程地质调查,利用RMR分级法和Q系统分级法对各类型岩体进行评价分级,采用Flac^(3D)软件对采空区形成过程及采空区稳定性进行模拟计算和预测分析。研究结果表明:上盘围岩与矿体岩体质量均良好,下盘围岩岩体质量中等。通过应力等值线云图、位移等值线云图和塑性区共同分析得出:方案1中2号和3号采空区的围岩由于剪切应力过于集中,剪切应力大于岩体抗剪能力,使围岩进入了塑性状态;最大位移出现在方案2的2号采空区顶板。水平位移最大值出现在采空区的顶面及底面中心处,且有贯通的趋势。方案2中塑性区虽未贯通,但采空区已有塑性区将对采空区的稳定造成一定安全隐患。In order to study the stability of complex goaf and carry out engineering geological survey,RMR classification method and Q system classification method are used to evaluate and classify each part of rock mass,and Flac^(3D)numerical simulation software is used to simulate and predict the formation process and stability of goaf.The classification results show that the quality of the surrounding rock mass of the upper wall and the ore body is good,and the qua-lity of the surrounding rock mass of the lower wall is medium.Through the analysis of stress isoline cloud map,displacement isoline cloud map and plastic zone distribution map,it is concluded that the surrounding rock of goaf No.2 and No.3 in Scheme 1 has a plastic state because the shear stress is too concentrated and higher than that of the rock mass itself,the maximum displacement appears in the roof of No.2 goaf,and the maximum horizontal displacement appears in the center of the top and bottom of the goaf and has a tendency of connection.Although the plastic zone in Scheme 2 is not connected,the existing plastic zone will impose certain potential safety hazard on the stability of the goaf.

关 键 词：采空区 数值模拟 稳定性 Q系统分级法 RMR分级法 

分 类 号：TD32[矿业工程—矿井建设]