摘要
针对李家壕煤矿软弱复合顶板的巷道赋存条件,以李家壕煤矿2-2煤层和3-1煤层为背景,对顶板的稳定性进行分析。软弱复合顶板突然断裂,大量弹性势能被释放,可能造成冲击地压的发生,易发生严重的人员伤亡事故。通过现场观测、数值模拟和工程实践,研究了采动对顶板下沉量、塑性区、离层量的破坏规律。结果表明,扰动应力波导致顶板发生剪切破坏,破坏范围远大于未扰动情况下顶板破坏范围,增大了发生顶板灾害的可能性,同时伴随着扰动强度的增加,顶板下沉量和离层量不断增大。研究结果对选择合理的支护强度、控制顶板灾害提供了科学的指导依据。
Based on the roadway occurrence conditions of soft and compound roof in Lijiahao Mine, 2-2 and 3-1 coal seam were taken as study object, the roof stability was analyzed. In case of abrupt fracture of soft and compound roof, elastic potential energy was released, with possible impact ground stress leading to casualty, damage law of roof subsidence, plastic zone and ionosphere were studied by site observation, numerical simulation and engineering. The result showed that stress wave disturbance led to shear failure of roof, the damage range much larger than un-disturbed condition, with increasingly roof subsidence and ionospheric volume. The research provided scientific reference for reasonable support and roof disaster control.
作者
智国军
贺艳军
Zhi Guojun;He Yanjun(Inner Mongolia Science and Technology Mining Research Institute ,Baotou 014010, China;Lijiahao Mine, Shenhua Baotou Energy Corporation Ltd., Erdos 017000, China)
出处
《煤炭与化工》
CAS
2018年第1期34-37,共4页
Coal and Chemical Industry
关键词
扰动应力
顶板稳定
下沉
断裂
离层
数值模拟
disturbance stress
roof stability
sinking
fracture
abscission layer
numerical simulation
