新景矿浅埋综采工作面顶板来压规律研究

Study on Roof Pressure Law of Shallow Fully Mechanized Mining Face

浅埋煤层综采工作面的埋深较浅不利于煤层的开采及围岩的稳定性,为探讨新景矿浅埋综采工作面顶板来压规律,以该矿8118工作面地质和开采条件为背景,通过数值模拟的方法分别对浅埋煤层综采工作面顶板垮落形态、顶板沉降及顶板应力分布进行分析,同时对初次来压和周期来压期间支架工作阻力进行现场监测.研究结果表明:初次来压期间,上下关键层间的岩层产生离层现象,上关键层向下弯曲未断裂;周期来压期间,扰动继续向上传递,上关键层发生大面积的垮塌断裂;周期来压时,支架工作阻力有较大增长,增大约61%.

The shallow depth of fully mechanized mining face in shallow coal seam is not conducive to the exploitation of coal seam and the stability of surrounding rock.In order to explore the roof pressure law of the fully mechanized mining face in Xinjing Mine.Based on the geology and mining conditions of the 8118 working face of the mine.The method of numerical simulation is used to analyze the roof collapse morphology,roof settlement and roof stress distribution in the fully mechanized mining face of shallow coal seam.At the same time,the working resistance of the bracket during the initial pressure and periodic pressure is monitored on site.The results show that during the initial pressure,the rock layers between the upper and lower key layers are separated,and the upper key layer is bent downward without breaking.The disturbance continues to pass upward during the period of pressure,and a large area of collapse occurs in the upper key layer.The working resistance of the pressure bracket has a large increase,which is about 61%.