用沙坝矿采场顶板稳定性模拟分析

贵州开磷矿业公司用沙坝矿主体为缓倾斜矿体,采用机械化盘区分段充填采矿法开采,通过研究采场跨度与顶板稳定性之间关系确保了作业人员安全和稳定生产.建立合理矿山开采力学模型后,对不同跨度采场在未支护方案下进行数值模拟分析表明,采场整体位移变化基本服从近对称分布;靠近开挖边界处围岩位移最大,距开挖边界越远,围岩位移越小,且移动方向均指向采空区;采场跨度在20m以内,采场顶板不发生破坏;当超过25m以上时,采场顶板出现较大拉应力,顶板开始发生破坏.

Simulation analysis of Yongshaba mining stope roof stability

The ore body of Yongshaba mine in Guizhou Kaiyang Phosphorite Group Company is a gently inclined one.It uses the mechanized sub-fill mining method panel mining.The study of the relationship between stope span and roof stability ensures the safety of operating personnel and stable production.According to the rock mechanical properties,this paper establishes the models with the different stope span under the program without supporting.The numerical simulations show that the stope overall displacement nearly obeys symmetrical distribution;surrounding rock near the excavation boundary has the maximum displacement,and the movement direction points towards gob;Stope roof without supporting can maintain its own stability in the span of 20 m,while the span increases to 25 m,the roof begins to be damaged.