关键词: 扰动巷道, 锚注网喷反底拱, 支护设计, 数值模拟

Abstract: Under the action of strong disturbance and high stress in the deep part，it is extremely diffi⁃ cult to control the deformation of the roadway floor. To solve the problems of fast deformation speed and large deformation volume of the bottom drum in the deep soft rock roadway，taking the severe bottom drum defor⁃ mation induced by the outer section of the 1137（1）track in Zhangji Mine as the engineering background，a technical solution for the treatment of the reverse bottom arch caused by the anchor injection net spray is pro⁃ posed. A research method combining theoretical analysis，numerical simulation and engineering practice is carried out，a mechanical analysis model of the base plate is constructed，and the failure depth of the base plate is obtained. Research shows that under the effect of strong disturbance，the excessive fragmentation of the surrounding rock of the roadway，the decline in strength，and the continuous expansion and extrusion of the fractured area of the surrounding rock are the main reasons for inducing the bottom drum. A support opti⁃ mization countermeasure for bottom-side joint compensation is proposed，forming a bottom-side combined support bearing structure. The technical solutions of shotcrete sealing，grouting reinforcement，and anchor cable reinforcement at the bottom corners are adopted. Based on the engineering geological conditions，the optimal support parameters for the reverse bottom arch depth of 1.0 m，steel mesh diameter of 12 mm，and a shotcrete strength of C20 are determined through simulation. The combined anchor support and reverse bot⁃ tom arch form a closed support structure，which plays an overall role in stress recovery，surrounding rock re⁃ inforcement，stress transfer and bearing ring control，achieving good application results and providing engi⁃neering reference and guidance for the treatment of bottom drum.

Key words: disturbed roadway, anchor injection net spraying reverse bottom arch, support design, numerical simulation