煤层采动影响下底板巷道稳定性分析

Stability analysis of floor roadway under the influence of coal seam mining

上覆煤层采动引起底板围岩应力重分布,导致底板巷道极易产生变形破坏,甚至发生安全事故并造成经济损失。为研究采动影响下底板巷道稳定性,本文基于陕北孙家岔龙华煤矿3煤采动实际工况,运用仿真软件FLAC3D进行数值模拟,设计工程监测方案并处理相关数据,最后将数值模拟结果与实测数据进行对比,验证研究一致性。分析得出,数值模拟显示随着3煤开采,底板应力改变了巷道应力场分布,但对底板巷道塑性区及内应力影响较小;监测结果表明,设计的大巷监测方案所得数据与数值模拟相似,3煤层采动对大巷影响较小,对于原有巷道支护无需加强支护。

The mining of overlying coal seams causes stress redistribution in the surrounding rock of the floor,leading to deformation and damage of the floor roadway,and even causing safety accidents and economic losses.In order to study the stability of the floor roadway under the influence of mining,this article was based on the actual working conditions of coal mining in a certain mine in northern Shaanxi.The simulation software FLAC3D was used for numerical simulation,designed an engineering monitoring plan,and processed relevant data.Finally,the numerical simulation results were compared with the measured data to verify the consistency of the research.Analysis showed that the numerical simulation shows that with the mining of No.3 coal seam,the floor stress changed the distribution of the tunnel stress field,but had little impact on the plastic zone and internal stress of the floor tunnel;The monitoring results indicated that the data obtained from the designed monitoring plan for the main roadway was similar to the numerical simulation.The impact of No.3 coal seam mining on the main roadway was relatively small,and there was no need to strengthen the support for the original roadway.