摘要
为解决工作面回采及巷道掘进影响下倾斜区段煤柱稳定性劣化的复杂问题,运用弹性力学半逆解法及摩尔-库伦准则建立力学模型,结合三维有限元数值模拟,深入分析了倾斜区段煤柱一侧受载结构形态特征,明确了倾斜煤柱失稳致灾力源及载荷的分布特性,探究了采掘扰动下倾斜区段煤柱塑性变形-失稳-破坏的动态演化过程,揭示了非对称载荷作用下倾斜区段煤柱临界失稳致灾机理,以此为基础优化了倾斜煤柱及周围巷道稳定性控制技术。结果表明:区段煤柱因煤层倾角导致的倾斜形态是煤柱所承受载荷呈非对称状的关键诱因,这一特性致使倾斜煤柱最底端区域覆载最大,且当此区域失稳破坏时,呈现由煤柱下端底角塑性区向煤柱上端底角塑性区扩展的运移过程,并因此得出倾斜区段煤柱临界尺寸随煤层倾角增大而增加的演化规律。由此,针对大南湖一矿倾斜区段煤柱及周围巷道变形失稳的问题,采用支护优化及注浆加固等措施,降低了倾斜区段煤柱侧巷道的变形速率,为类似矿井的煤柱稳定性控制提供了借鉴。
To solve the complex issue of deteriorating stability of the inclined section coal pillar under the impact of working face mining and roadway excavation,the study utilized the semi-inverse method of elasticity mechanics and the Mohr-Coulomb criterion to establish the mechanical model.Combined with three-dimensional finite element numerical simulation,the study deeply analyzed the loading structural morphology on one side of the inclined section coal pillar,and made clear the source and distribution characteristics of the disaster-causing forces.The dynamic evolution process of plastic deformation-instability-destruction of the inclined section coal pillar under mining and excavation disturbances was explored.This revealed the critical instability disaster mechanism of the inclined section coal pillar under asymmetric load,thereby optimizing the stability control technology for the coal pillar and the surrounding roadway.The result shows that:the inclined form of the section coal pillar,caused by the inclination angle of the coal seam,is a key factor under the influence of asymmetry load.This characteristic makes the bottom zone of inclined coal pillar bear the maximum load.When the zone becomes unstable or destroyed,it expands from the plastic zone at the lower bottom of the coal pillar to the plastic zone at the upper bottom.Consequently,the regular of evolution is concluded that the critical size of the inclined section coal pillar increases with the increase in the inclination angle of the coal seam.Therefore,aiming at the problem of deformation and instability in the bottom of coal pillar and the surrounding roadway in Dananhu No.1 Mine,some measures such as optimization of the roadway support and grouting reinforcement can reduce the deformation rate of the roadway beside the inclined section coal pillar,providing a reference for the stability control of coal pillars in similar mines.
作者
来兴平
尉迟小骞
单鹏飞
方贤威
LAI Xingping;YUCHI Xiaoqian;SHAN Pengfei;FANG Xianwei(College of Energy Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;Key Laboratory of Western Mine Exploitation and Hazard Prevention,Ministry of Education,Xi’an University of Science and Technology,Xi’an 710054,China)
出处
《西安科技大学学报》
CAS
北大核心
2024年第2期203-212,共10页
Journal of Xi’an University of Science and Technology
基金
国家自然科学基金项目(51904227)。
关键词
倾斜区段煤柱
非对称载荷
临界尺寸
数值模拟
巷道支护优化
inclined section coal pillar
asymmetric load
critical size
numerical simulation
optimization of roadway support
