陕西煤炭

禾草沟煤矿5号煤层工作面巷道掘进过程中，频繁出现强矿压显现，导致顶板支护困难，严重影响采掘接替。为此，提出在503盘区实行上行开采的强矿压灾害治理方案，即首先回采下部较厚的3^-2煤层，以对上部5号煤层进行卸压，从而避免强矿压显现。采用FLAC^3D数值模拟软件，研究了3^-2煤层开采后上覆岩层的移动和变形规律，重点分析了采动后覆岩裂隙演化以及顶板卸压程度，据此评估上行开采可行性以及对强矿压灾害防治效果。研究结果表明，采用上行开采后3^-2煤层裂隙带高度最大为36.52 m,小于3^-2煤层与5号煤层的间距，满足上行开采技术要求；5号煤层处于3^-2煤层弯曲下沉带内，最大应力值仅为12.29 MPa,显著低于原岩应力，能够有效实现卸压。本研究为禾草沟煤矿503盘区上行开采提供了理论指导，为类似条件下的上行开采技术应用提供了科学依据。

During the excavation of roadway in the 5^th coal seam working face at the Hecaogou Coal Mine, strong mine pressure frequently manifested, leading to difficulties in roof support and severely affecting the mining operation.An upward mining disaster prevention plan for strong mine pressure was proposed in the 503 panel area.This plan involves first recovering the thicker 3^-2 coal seam below, thereby unloading pressure from the upper 5th coal seam to prevent strong mine pressure from manifesting.FLAC^3D numerical simulation software was used to investigate the movement and deformation patterns of the overlying rock layers after the mining of the 3^-2nd coal seam.The focus was on analyzing the evolution of fractures in the overlying rock and the degree of pressure relief in the roof, which was then used to assess the feasibility of upward mining and its effectiveness in preventing and controlling strong mine pressure disasters.The results of the study showed that after upward mining, the height of the fracture zone in the 3^-2 coal seam reached a maximum of 36.52 m, which is less than the distance between the 3^-2 coal seam and the 5^th coal seam, thus meeting the technical requirements for upward mining.The 5^th coal seam is located within the subsidence zone of the 3^-2 coal seam, where the maximum stress value is only 12.29 MPa, significantly lower than the original rock stress, indicating effective pressure relief.