倾斜煤层采空区煤柱失稳边坡稳定性研究  

Study on slope stability of coal pillar instability in goaf with inclined coal seam

作　　者：梁冰[1] 黄昌明 孙维吉[1] 王甄博 LIANG Bing;HUANG Changming;SUN Weiji;WANG Zhenbo(School of Mechanics and Engineering,Liaoning Technology University,Fuxin Liaoning 123000,China;College of Mining,Liaoning Technology University,Fuxin Liaoning 123000,China)

机构地区：[1]辽宁工程技术大学力学与工程学院,辽宁阜新123000 [2]辽宁工程技术大学矿业学院,辽宁阜新123000

出　　处：《中国安全生产科学技术》2024年第9期73-80,共8页Journal of Safety Science and Technology

基　　金：国家自然科学基金项目(52074143)。

摘　　要：为了探究平庄西露天矿露井联采扰动下采空区煤柱失稳对边坡稳定性影响。采用相似模拟实验和数值模拟方法,研究平庄西露天矿不同开采阶段及采空区煤柱失稳边坡应力-位移-塑性区的演化规律及安全系数变化。研究结果表明:采空区煤柱失稳垮塌,对坡体的中上部影响较大,从而引起应力集中区域产生裂隙;在煤层采动期间边坡中部顶端达到剪切破坏的临界值,但随着采空区煤柱坍塌,坡体重心后移,剪应力减小,一定程度上抑制坡体向下滑移;采空区煤柱坍塌,边坡安全系数降低,边坡由稳定转为基本稳定状态,稳定性降低,滑坡的可能性增加。研究结果可为露天矿井工开采提供理论指导。In order to explore the influence of coal pillar instability in goaf on the slope stability under the disturbance of open-underground combined mining in Pingzhuang West open-pit mine,the evolution law of slope stress-displacement-plastic zone and the change of safety factor of coal pillar instability in different mining stages and goaf of Pingzhuang West open-pit mine were studied by the similar simulation experiment and numerical simulation method.The results show that the collapse of coal pillars in goaf significantly affects the upper-middle part of slope,leading to the formation of cracks in the stress concentration area.During the coal seam mining period,the topin the middle part of slope reaches the critical value of shear failure.However,with the collapse of coal pillars in goaf,the center of gravity of slope moves backward,and the shear stress decreases,which inhibits the downward sliding of slopeto some extent.The collapse of coal pillars in goaf reduces the safety factor of slope,and the slope changes from stable to basic stable state,then the stability decreases,and the possibility of landslide increases.The research results can provide theoretical guidance for the underground mining ofopen-pit mines.

关 键 词：边坡稳定性 煤柱 露井联采 数值模拟 相似模拟 

分 类 号：X936[环境科学与工程—安全科学]