超大规模采场破顶窿形线优化及稳定性模拟研究  

Contour Optimization for Broken Roof of Super-large Stope by Numerical Simulation

作　　者：王发民[1] 史秀志[1] 王洋[1] 陈佳耀[1] 

机构地区：[1]中南大学资源与安全工程学院,湖南长沙410083

出　　处：《矿冶工程》2017年第5期19-24,共6页Mining and Metallurgical Engineering

基　　金："十二五"国家科技支撑计划(2013BAB02B05)

摘　　要：选取椭圆线、抛物线、圆形线、直线4种不同曲线为模型,对破顶层爆破窿形线进行了优化研究,利用FLAC^(3D)数值模拟软件对4种顶板窿形线下的采场围岩变形特征、塑性区分布及周边应力情况进行了模拟,同时对比分析了采场有无侧向抗力对模拟结果的影响。结果表明,周边单元应力与曲线斜率具有较高相关性,曲率越大,应力越大;采场顶板窿形线形状对采场围岩变形特征及围岩塑性区的分布影响较大,圆形线为最优爆破窿形线,直线形最差;采场顶板在有侧向抗力时的稳定性比无侧向抗力时好,且两种条件下的最优顶板窿形皆为圆形。A stope after blasting with broken roof of 4 different contours,including oval,parabolic,round and straight line,are selected for the optimization study. The deformation characteristics and rock plastic zone distribution,stress of surrounding rock were simulated using FLAC-（3D）,and simulation results with and without lateral resistance in stope were also analyzed by comparison. Results show that surrounding stress is closely relative to the slope of four curves,and a higher slope leads to the higher stress. A contour of stope roof has great impact on the deformation characteristics and plastic zone distribution of surrounding rock. The round contour is optimal and the shape with a straight line is the worst.The stope roof with lateral resistance is more stable than that without lateral resistance,and a round shape contour is optimal for the stope roof regardless of lateral resistance.

关 键 词：采场顶板 破顶层 稳定性 窿形线优化 数值模拟 

分 类 号：TD325[矿业工程—矿井建设]