倾斜不稳定煤层采动工作面底板破坏深度研究

Study on Failure Depth of Floor in Working Face of Inclined Unstable Coal Seam

为探究丰阳煤矿11采区11104工作面倾斜不稳定煤层采动底边变形破坏特征,通过现场实测与数值模拟,获得了该工作面底板变形破坏深度及采动矿压对底板的作用特征。研究结果表明,11104工作面采动底板变形具有分带性,可划分为“两带”,其中采动破坏带(Ⅰ)不超过20.0 m,扰动塑性损伤带(Ⅱ)不超过21.2 m;采后底板应变感应的数据变化反映出11104工作面底板矿压剧烈延续影响范围较大,采后卸压对底板产生了较强的扰动效应;获得该工作面采动煤层底板破坏深度不超过20.0 m。

In order to explore the deformation and failure characteristics of the mining bottom edge of the 11104 working face in the 11 mining area of Fengyang coal mine, the working face of the inclined unstable coal seam was obtained through field measurement and numerical simulation. The research results show that the deformation of the mining floor of the 11104 working face is zonal and can be divided into "two zones", in which the mining damage zone(I) does not exceed 20.0 m, and the disturbance plastic damage zone(II) does not exceed 21.2 m;the changes in the strain-sensing data of the rear floor reflect that the mining pressure of the 11104 working face continues to have a large influence range, and the post-mining pressure relief has a strong disturbance effect on the floor;it is obtained that the failure depth of floor in the working face is not more than 20 m.