关键词: 无底柱分段崩落法　, 采矿扰动　, 破碎围岩　, 进路大变形　, 注浆支护

Abstract: Regarding the instability failure of the stoping entry in the caving method stope of the West Ⅱ Mining Area at
Longshou Mine under the original shotcrete-bolt-mesh support system,field investigations and numerical simulation studies
were conducted. It was determined that the essential cause of the entry′s instability is the inherent fragmentation of the surrounding
rock mass and its continuous deterioration under the disturbance from caving mining. This led to the loss of integrity
in the self-supporting system,resulting in insufficient anchorage depth in the original support scheme,which failed to form an
effective load-bearing whole from the fractured surrounding rock. A grouting reinforcement scheme suitable for the fractured
surrounding rock of stoping entries under the disturbance conditions of caving mining was proposed through comprehensive theoretical
analysis and numerical simulation. The study determined that a reasonable reinforcement range should be no less than 2
m,and accordingly,five grouting hole layouts were designed,with their reinforcement effects systematically evaluated. The study
results show that as the number of grouting holes increases,the reinforcement effect continues to improve,but the rate of improvement
gradually decreases. After implementing the grouting support scheme,the range of the minimum principal stress zone
in the two sides of the entry significantly contracted,stress vectors shifted deeper into the surrounding rock,and a pressurebearing
arch formed jointly by the surrounding rock and support structure gradually developed,contributing to the stability of
the entry. Based on the numerical simulation results,the five-hole grouting scheme was ultimately selected,with a grouting hole depth of 2 m and a row spacing of 2 m. Field engineering applications demonstrated that the proposed grouting reinforcement
support scheme effectively controlled the deformation and failure of the entry,reducing deformation by 85% compared to the initial
support scheme,thereby ensuring the safety of mining operations.