树儿里煤矿8206综放面矿压观测及显现规律研究

Study on ground pressure observation and behavior law of No.8206 fully mechanized top coal caving face in Shuerli Mine

为保证特厚煤层综放开采的安全,在树儿里煤矿8206工作面开展了特厚煤层综放开采矿压规律的研究。综合采用现场实测、理论计算和数值模拟分析的方法,主要结论如下:①8206工作面中部初撑力较低,片帮相对严重,最大片帮范围超过1.0 m;②8206初次来压步距为36.5 m,周期来压步距为23.7 m;③工作面前方受采动影响产生的裂隙按位移量的大小可分为原生裂隙张开区、次生裂隙发育区和大变形区3个区域;④端面距控制在0.5 m以内,有利于保证端面煤岩体的稳定。

In order to ensure the safety of fully mechanized top coal caving mining in extra thick coal seam,the study on the ground pressure law of fully mechanized top coal caving mining in extra thick coal seam was carried out in 8206 working face of shuerli coal mine.Using the methods of field measurement,theoretical calculation and numerical simulation analysis,the main conclusions are as follows:①the initial bracing force in the middle of 8206 face is low,the slope is relatively serious,and the maximum slope range is more than 1.0 m;②8206 the initial pressure step is 36.5m,and the periodic pressure step is 23.7 m;③According to the displacement,the fractures caused by mining in front of the work can be divided into three parts:primary fracture opening area,secondary fracture development area and large deformation area;④The distance between end faces is controlled within 0.5 m,which is conducive to ensuring the stability of coal and rock mass at end faces.