采矿与安全工程学报2026，Vol.43Issue(3)：615-626,12.DOI:10.13545/j.cnki.jmse.2024.0584
非连续结构面对巷道顶板稳定性及锚杆支护作用的影响机制研究
Research on the impact mechanism of discontinuities on the stability of roadway roof and the supporting effect of rock bolt
摘要
Abstract
The stability of roadway roof is one of the key factors affecting safety and production in coal mines,yet the presence of discontinuous structural planes(DSPs)has a considerable impact on roof stability and support effectiveness.This study investigated the effects of four different types of DSPs on the deformation and failure of roof,the force distribution of rock bolts,and the evolution of force chain based on physical model experiments and UDEC numerical simulations on roadway roof.The main conclusions are as follows:The physical and numerical models of the roof under four different DSP conditions exhibit arching failure characteristics.A pressure arch determination method based on numerical simulation was proposed,and the evolution mechanism whereby both the height and angle of the pressure arch enlarge as the DSP develops increases was uncovered.Besides,the regional force distribution characteristics were clarified,that is,the force on the bolts at the roof corners is much higher than that at the central position.It was found that with the development of DSP,the initial stress increase in rock bolts diminishes during early deformation of surrounding rock,while stress attenuation intensifies during severe deformation.The weakening effect of DSP on surrounding rock force chains was revealed.Such a weakening effect leads to reduced stability and expanded extent of unstable surrounding rock,which drives the pressure arch evolution from low to high.The negative correlation between the development degree of DSP and the effectiveness of rock bolt support was explained.To be specific,a higher development degree of DSP corresponds to more pronounced rock bolt anchoring failure and gradually decreasing effectiveness in restraining rock deformation through increased support resistance.The increase in DSP not only significantly weakens the integrity and strength of the roof surrounding rock and exacerbates rock deformation and failure,but also makes the rock bolt more prone to debonding failure and worsens overall rock bolt support performance.关键词
非连续结构面/巷道顶板/数值模拟/压力拱/力链/锚杆支护Key words
discontinuity/roadway roof/numerical simulation/pressure arch/force chain/rock bolt support分类
矿业与冶金引用本文复制引用
李建忠,娄金福,王晓卿,原贵阳..非连续结构面对巷道顶板稳定性及锚杆支护作用的影响机制研究[J].采矿与安全工程学报,2026,43(3):615-626,12.基金项目
国家自然科学基金项目(52304090) （52304090）
中煤科工开采研究院有限公司"科技创新基金"(KCYJY-2023-MS-01) （KCYJY-2023-MS-01）
天地科技股份有限公司科技创新创业资金专项项目(2023-2-TD-ZD004) （2023-2-TD-ZD004）
