基于FLAC^(3D)的急倾斜厚煤层卸压瓦斯抽采数值模拟

Numerical Simulation of Pressure Relief Gas Extraction in Steeply Inclined Thick Coal Seam Based on FLAC^(3D)

运用FLAC^(3D)模拟软件,对大黄山煤矿的急倾斜厚煤层开采过程进行卸压瓦斯抽采的数值模拟,得出两层煤的应力分布规律及顶底板的位移变化规律。对中大槽煤层工作面底板煤岩层的受力特性进行分析,认为有必要对卸压区域煤体进行瓦斯预抽和卸压瓦斯抽采。根据现场实测数据得出,接替工作面残余瓦斯压力为0.21 MPa,残余瓦斯含量为2.873 m^3/t,可解析瓦斯量为0.563 m^3/t,可判定该区域内瓦斯抽采效果达标。

By using FLAC^（3D） simulation software,the numerical simulation of pressure relief gas drainage was carried out in steeply inclined thick coal seam mining process of Dahuangshan Coal Mine,and the stress distribution and displacement laws of roof and floor of two layers of coal was obtained. We analyze the coal and rock stress characteristics of the coal seam floor in the middle and large slots working face. It is necessary to carry out gas pre-extraction and pressure relief gas drainage. According to the measured data in field,the residual gas pressure of the replacing working surface is 0. 21 MPa,the residual gas content is 2. 873 m^3/t,and the amount of gas can be desorbed is 0. 563 m^3/t,which can determine that the gas drainage effect in this area is up to the standard.