摘要
巷道快速掘进是破解煤矿采掘失衡最为可行的关键技术。针对巷道围岩对快速掘进的瞬态和时效力学响应新问题,构建Power-Mohr黏弹塑性蠕变巷道开挖数值模型,对比分析不同掘进速度下顶板应力变形时空演化过程,创新性提出“变形均化、应力甩滞、强度阻断”快速掘进三大核心理念。结果表明:快速掘进技术缩小了巷道超前影响的范围,影响区域由8 m缩小至2 m,且超前变形量、轴向变形梯度及累积变形量均有所减小;同时,快速掘进使开挖面前方最大主应力降低,工作面空顶区始终处于低应力环境;巷道开挖后,支护锚杆可实现快速增阻。快速掘进有利于优化围岩应力、改善变形控制,该研究结果可为巷道快速掘进技术与装备的发展提供理论基础。
Rapid roadway excavation emerges as the most viable technological solution to mitigate structural imbalances in underground coal extraction.To address the transient and time-dependent mechanical interactions between excavation activity and surrounding rock strata,a computational framework based on a Power-Mohr viscoelastic-plastic creep model was developed.Through comparative analysis on spatiotemporal stress redistribution and deformation patterns at varying excavation velocities,a novel conceptual framework that emphasizes the three critical mechanisms of deformation homogenization,stress hysteresis,and strength blocking was introduced.Key findings reveal that accelerated excavation rates shrink the advanced influence zone from 8 m to 2 m,while also reducing the magnitude of advanced deformation,axial deformation gradient,and cumulative deformation.In addition,rapid excavation attenuates the peak principal stress ahead of the excavation face and maintains the excavated roof zone within a stabilized low-stress regime.After roadway excavation,rapid resistance enhancement can be realized by support bolts.Rapid excavation is conducive to optimizing surrounding rock stress and improving deformation control.The findings of this study are expected to offer a theoretical foundation for the development of rapid excavation technologies and intelligent engineering systems.
作者
许兴亮
石灏
田素川
胡伟超
雷永超
郭智龙
李增辉
XU Xingliang;SHI Hao;TIAN Suchuan;HU Weichao;LEI Yongchao;GUO Zhilong;LI Zenghui(School of Mines,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;Henan Energy Group Co Ltd,Zhengzhou,Henan 450046,China)
出处
《采矿与安全工程学报》
北大核心
2026年第2期280-290,共11页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(51864044)
煤炭精细勘探与智能开发全国重点实验室自主课题项目(SKLCRSM21X003)。
关键词
快速掘进
开挖空间
时空效应
应力分布
变形演化
fast excavation
excavation space
spatiotemporal effect
stress distribution
deformation evolution
