【摘要】 顶板突然断裂时易诱发冲击矿压灾害,造成重大伤亡事故.为了研究顶板突发断裂的诱导因素,采用FLAC3D软件的动力学模块分析了动力扰动对顶板稳定性和断裂规律的影响,以及不同扰动强度下顶板破坏规律.结果表明,动力扰动造成顶板剪切破坏,在煤壁上方形成剪切带,从而易导致顶板突发剪切断裂破坏,增大了发生顶板灾害的可能性.且随着扰动峰值增加,扰动破坏影响强度和影响范围都显著增大.结论对制定合理的顶板灾害预防措施有着重要指导作用.更多还原

【Abstract】 Rock bursts can be easily induced by a sudden fracturing of roof which causes a serious casualty.In order to study induction factors of roof fracture,the effect of roof stability and fracture characteristics under dynamic disturbance are simulated by using dynamic analysis module of FLAC3D,the failure forms and patterns under different dynamic disturbance intensity are gained.The results show that extensive shear failure of roof is induced by the action of dynamic disturbance,a shear band is formed under the wall,then it can result in a sudden shear failure and the possibility of roof disaster increases.The affecting intensity and range significantly increase with the increase of disturbance peak value.The research results are very effective in selecting rational roof disaster prevention measures.更多还原