动压影响下巷道围岩稳定性分析及支护优化方案研究
Analysis of Tunnel Surrounding Rock Stability under Dynamic Pressure and Research on Support Optimization Scheme
李清艳1
作者信息
- 1. 山西潞安化工集团公司能源事业部生产部,山西 襄垣 046205
- 折叠
摘要
利用有限差分软件分析围岩的应力、变形及塑性区的演化规律,提出支护方案,结合现场试验解决围岩变形过大的问题,揭示巷道变形失稳原理.取得如下结论:受动压影响,顶板周期破断并释放大量的弹性势能,随着回采工作面的前进而不断地向前方和下方传递,导致实体煤柱上方与两帮的中部形成高应力场,出现了顶板下沉、底鼓开裂与两帮位移严重等破坏特征,产生结构弱面,并最终形成围岩破碎区;针对支护强度不足的问题,利用锚索+钢带+钢筋网的支护体系进行加固,根据模拟及现场试验结果表明,巷道变形较之前显著变小,锚索能够稳定发挥支护作用,围岩控制效果较好.
Abstract
Utilizing finite difference software to analyze the stress,deformation,and evolution law of the plas-tic zone of surrounding rocks,a support scheme is proposed to address the issue of excessive rock deforma-tion based on field experiments,and to elucidate the principles of tunnel deformation and instability.The fol-lowing conclusions were drawn:Under dynamic pressure,the roof undergoes periodic fracturing and releases a significant amount of elastic potential energy,which propagates forward and downward with the advancement of the mining face.This results in the formation of a high-stress field above the solid coal pillars and in the middle of both sides,manifesting in roof subsidence,floor heave cracking,and severe displacement of both sides,ultimately creating structural weak planes and a fractured zone in the surrounding rocks.To ad-dress the issue of insufficient support strength,a reinforcement system comprising anchor cables,steel belts,and steel mesh was employed.Simulation and field test results indicate that tunnel deformation is significant-ly reduced compared to previous conditions,the anchor cables effectively maintain their support function,and the surrounding rock control effect is satisfactory.
关键词
动压/围岩稳定/数值模拟/支护方案Key words
Dynamic Pressure/Surrounding Rock Stability/Numerical Simulation/Support Scheme引用本文复制引用
出版年
2024
NETL
NSTL
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