摘要
针对坚硬顶板条件下软岩巷道变形破坏工程难题,以王家寨煤矿1108水仓回风巷变形破坏为工程背景,采用现场调研、数值模拟以及现场工业性实验的方法,对不同围压比下,坚硬顶板条件下的软岩巷道围岩破坏特征开展了研究,探讨了不同围压比下坚硬顶板巷道围岩变形破坏机理,并提出了相应的围岩支护方案。研究表明:随着侧压力系数增大,顶底板应力集中现象加剧,两帮及底板塑性区深度显著增加,变形量与变形速度加大,为此提出了一种以“预应力桁架锚索”为核心,结合“关键部位加强+全断面注浆”的综合控制技术。现场监测数据表明,新支护方案能显著控制巷道围岩的变形与破坏,能够满足煤矿安全生产的实际要求。
Aiming at the engineering problem of deformation and failure of soft rock roadways under hard roof conditions,taking the deformation and failure of the return air roadway of the 1108 water sump in Wangjiazhai Coal Mine as the engineering background,the failure characteristics of the surrounding rock of soft rock roadways under hard roof conditions with different confining pressure ratios were studied by means of on-site investigation,numerical simulation and on-site industrial experiments.The deformation and failure mechanism of surrounding rock in hard roof roadways under different confining pressure ratios was discussed,and the corresponding surrounding rock support schemes were proposed.Research shows that as the lateral pressure coefficient increases,the stress concentration phenomenon between the top and bottom plates intensifies,the depth of the plastic zones on both sides and the bottom plate significantly increases,and the deformation amount and speed also increase.Therefore,a comprehensive control technology with"prestressed truss anchor cable"as the core,combined with reinforcement of key parts and full-section grouting,is proposed.On-site monitoring data indicates that the new support scheme can significantly control the deformation and failure of the surrounding rock of the roadway and can meet the actual requirements of safe coal mine production.
作者
陈忠义
王卫军
袁超
杜荣杰
CHEN Zhongyi;WANG Weijun;YUAN Chao;DU Rongjie(School of Resource&Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411100,China)
出处
《煤》
2026年第2期1-6,17,共7页
Coal
基金
国家自然科学基金联合基金项目(U24A2086)。
关键词
巷道软岩
塑性区
坚硬顶板
围岩控制
巷道支护
soft rock in roadways
plastic zone
hard top plate
surrounding rock control
roadway support
