回采巷道围岩破坏机理与控制技术研究  

Research on failure mechanism and control technologyof surrounding rock in mining roadway

作　　者：邢云峰 XING Yun-feng(Shanxi Zezhou Tiantai Energy Co.,Ltd.,Jincheng 048000,China)

机构地区：[1]山西泽州天泰能源有限公司,山西晋城048000

出　　处：《煤炭科技》2024年第2期70-77,共8页Coal Science & Technology Magazine

基　　金：深井瓦斯抽采与围岩控制技术国家地方联合工程实验室开放基金项目(SJF201801)。

摘　　要：巷道开挖导致巷道围岩应力重新分布,塑性区也不断扩展。为确定坤达煤矿巷道围岩变形破坏情况并制定巷道支护方案,以坤达矿回采巷道为工程背景,采用理论分析建立非均匀应力场圆形巷道受力模型,推导了圆形巷道围岩塑性区边界方程;数值模拟回采巷道在采动影响下的围岩破坏塑性区分布,并依据塑性区破坏深度提出巷道优化支护方案;数值模拟了原始支护方案与优化后支护方案的巷道围岩变形情况,发现优化支护后破坏范围、顶底板以及两帮位移量显著降低,围岩的变形情况得到控制。通过工业性试验和检测结果发现,顶板下沉量随工作面推进而增大,巷道在距工作面25~35 m受到的采动影响最为剧烈。优化支护后的巷道经采动影响后围岩变形量不大,达到了巷道支护设计要求,证明工作面回采巷道的优化支护设计是科学合理的。Roadway excavation causes the stress of the roadway surrounding rock to be redistributed,and the plastic zone also continues to expand.In order to determine the deformation and damage of the roadway surrounding rock in Kunda Coal Mine to determine the roadway support plan,theoretical analysis was used to establish a stress model for circular roadways with non-uniform stress fields,and the boundary equation for the plastic zone of the surrounding rock of the circular roadway was derived.Numerical simulation of the plastic zone distribution of surrounding rock failure in mining roadways under the influence of mining,and proposing optimized support schemes for roadways based on the depth of plastic zone failure.Numerical simulations were conducted on the deformation of the surrounding rock of the roadway in both the original and optimized support schemes.It was found that the optimized support significantly reduced the range of damage,the displacement of the roof and floor,and both sides,and controlled the deformation of the surrounding rock.Through industrial tests and inspection results,it was found that the roof subsidence increases with the advancement of the working face,and the roadway received the most severe mining impact within the range of 25~35 m from the working face.After optimizing the support,the deformation of the surrounding rock in the roadway after mining is not significant,which meets the requirements of the roadway support design,proving that the optimized support design of the working face mining roadway is scientific and reasonable.

关 键 词：非均匀应力场 数值模拟 围岩变形 支护参数优化 

分 类 号：TD353[矿业工程—矿井建设]