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针对工作面过空巷易出现矿压显现剧烈及空巷围岩大变形等问题,基于岩层运动中心建立的矿山压力理论为指导思想,以切顶短臂梁为理论基础,提出了综放工作面过空巷切顶卸压+恒阻大变形锚索支护技术。利用理论分析和数值模拟的方法分析了巷道围岩的稳定性、估算出周期来压步距及构建空巷理论力学模型,通过预裂爆破和等压小煤柱技术,使得超前支撑压力峰值处于空巷前方的煤壁深处,同时结合恒阻大变形锚索耦合支护技术控制巷道顶板的大变形。数值模拟结果显示,工作面周期来压步距约23.4 m,周期来压时超前支承压力位于煤壁前方12 m处。
Aiming at the problems of drastic underground pressure and excessively large deformation of surrounding rock in the passageway of empty face, based on the mine pressure theory established by the rock movement center and the roof-cut short beam as theoretical basis, Overhead emptying alley top pressure relief + large deformation of anchor cable supporting technology. The stability of roadway surrounding rock is analyzed by theoretical analysis and numerical simulation method, the cycle pressure step is estimated and theoretical model of roadway is established. Through presplit blasting and isopressing coal pillar technology, the peak value of advance support pressure is at In front of the empty coal wall depth, combined with large deformation resistance of the anchor cable coupling support technology to control the large deformation of roadway roof. The numerical simulation results show that the pressure step of the face is about 23.4 m, and the advance support pressure is 12 m ahead of the coal wall in the periodic pressure.