采矿与安全工程学报2025，Vol.42Issue(2)：371-381,11.DOI:10.13545／j.cnki.jmse.2024.0309
远场弱动载触发深部高应力煤层大巷冲击地压发生机制及防控机理
Mechanism and technology of preventing and controlling rock burst in roadway in deep high stress disk area in far field weak dynamic load
摘要
Abstract
Based on the engineering background of the roadway in the first plate area of Shanxi Coal Mine,the instability characteristics and shock inducing mechanism of the surrounding rock in the road-way in the deep high stress plate area under the disturbance of the far field weak dynamic load are stud-ied with field monitoring,laboratory test and theoretical analysis.The results reveal that the mechanical environment of the roadway surrounding rock is influenced by the mining activities of two working faces in the mining area.Initially,the spatial structure of the overlying rock in one area exhibits an"F"shape.The spatial structure of the overlying rock in the roadway changes to a double"F"shape since the first working face in the second area is mined.As other working faces in both areas are mined,the spatial structure of the overlying rock in the roadway eventually takes on a"T"shape.In this process,the static stress level of the surrounding rock in the roadway continuously increases due to long-term high static stress,resulting in the continuous accumulation of coal damage and the continuous deterioration of strength.During this period,continuous disturbances are applied to coal samples in the creep stage,lead-ing to more active acoustic emission activity,and an earlier transition into the accelerated creep stage than undisturbed samples.When the coal samples undergo unstable failure,the amplitude,count,and energy of the acoustic emission are more intense than undisturbed samples does.Moreover,the higher the static stress level that the coal samples are subjected to,the more serious the damage caused by dy-namic disturbances.Subjected to weak dynamic disturbances,the damaged coal samples experience non-steady-state failure,which is manifested as a combination of long-term high static stress and frequent mine tremors in the near field,leading to the decrease of the minimum load required for coal-rock mass impact.The weak dynamic load superimposed on the attenuated mine tremors in the far field exceeds the reduced minimum load required for pressure bump.At this point,the remaining energy in the coal-rock mass exceeds the minimum energy required for impact,resulting in pressure bump in the roadway.The research findings provide a theoretical basis for the monitoring,early warning,and prevention and con-trol of pressure bump in deep mining and preparatory roadways(coal roadways).关键词
盘区大巷/覆岩空间结构/近场累积损伤/远场弱动载/诱冲机理Key words
block area alley/overburden spatial structure/near field cumulative damage/far field weak dynamic load/creep/induced impact mechanism分类
矿山工程引用本文复制引用
李家卓,彭瑞,窦林名,杨科,解文豪..远场弱动载触发深部高应力煤层大巷冲击地压发生机制及防控机理[J].采矿与安全工程学报,2025,42(2):371-381,11.基金项目
国家重点研发计划项目(2022YFC3004603) （2022YFC3004603）
国家自然科学基金区域创新发展联合基金重点项目(U21A20110) （U21A20110）
国家自然科学基金项目(52004004) （52004004）
