论文部分内容阅读
为掌握中等稳定顶板巷道超前压力分布显现规律,以中煤平朔井工矿9煤综放工作面工况为研究对象,采用实测超前压力数据与数值模拟分析相结合的方法,分析了回风巷超前压力的影响范围与强度,围岩的竖向位移与应力的变化规律,围岩松动区及锚索、锚杆受力变化情况。结果表明,受二次采动影响,锚索无法起到悬吊作用,巷道必须加强超前支护,超前支护范围距综采工作面煤壁约30 m,超前支护强度应力峰值区域距工作面5~8 m范围,超前支护强度应大于0.167 MPa。
In order to grasp the regularity of advancing pressure distribution of medium and stable roof roadway, taking the working conditions of No.9 coal caving working face in Pingshuojing Mine of China Coal as the research object, the method of combining the measured forward pressure data and numerical simulation analysis was used to analyze the air return lane The influence range and intensity of advance pressure, the law of vertical displacement and stress of surrounding rock, the loosening area of surrounding rock and the change of anchor rod and anchor rod force. The results show that the cable can not be suspended due to the secondary mining, and the advance support must be strengthened in the roadway. The range of advanced support is about 30 m away from the coal wall of the fully mechanized mining face, and the peak stress area of the advance support strength is away from the work Surface 5 ~ 8 m range, advance support intensity should be greater than 0.167 MPa.