基于五图双系数法的煤层底板突水危险性评价

摘要

为准确预测煤层底板突水的危险性,以平煤八矿为例,利用五图双系数法对二1煤层底板寒武系灰岩水发生突水的危险性进行了预测评估.通过分析隔水层与水压的关系,计算了带压系数和突水系数;利用Surfer绘图软件,绘制了底板水压、水头分布、突水系数的等值线图和突水危险性分区图.该方法比突水系数法更为全面;与脆弱性指数法相比,不需要太多的相关资料.结果显示,突水危险性较大的区域分布在矿区的西北和东北部,面积较小;南部和中部有2个小的区域属于基本安全区;其他区域属于突水危险性较小的区域.整体而言,平煤八矿二1煤层底板寒武系灰岩水发生突水的危险性小.%In orter to exactly predict risk the of water inrush on coal floor,using five figures and double coefficients method,based on data from the No.8 coal mine of Pingmei,the risk of the Cambrian limestone water inrush on 21 coal floor was forecasted and assessed.By analyzing the relationship between the impermeable layer and the water pressure,the pressure coefficient and water inrush coefficient were gotten.Then contour maps of hydraulic pressure on coal floor,thickness of effective water-resisting layer,water inrush coefficient and the partition map of water inrush risk were drawn by using Surfer software.The result showed that the water inrush risk of the mining area in the northwest and northeast was relatively larger than the others,but the area was relatively smaller.There are two small areas in the south and central,which belong to the level of basic safety.The rest of mining area belongs to the level of small water inrush risk.Overall,the Cambrian limestone water inrush risk on 21 coal floor of No.8 coal mine in Pingmei is relatively small.