顶板岩层特性对煤体冲击影响的数值模拟  

Numerical Simulation of Roof Stratum Effect on Coal Mass Burst

作　　者：牟宗龙[1] 窦林名[1] 李慧民[2] 张翔宇[1] 王晓亮[1] 

机构地区：[1]中国矿业大学煤炭资源与安全开采国家重点实验室,矿业工程学院,江苏徐州221008 [2]重庆工程职业技术学院,重庆400037

出　　处：《采矿与安全工程学报》2009年第1期25-30,共6页Journal of Mining & Safety Engineering

基　　金：中国矿业大学科技基金(青年)项目(0A080236);煤炭资源与安全开采国家重点实验室开放研究基金项目(08KF09);国家“十一五”科技支撑计划项目(2006BAK04B02)

摘　　要：利用离散元程序UDEC4.0对煤层上覆顶板岩层的物理、几何属性及运动状态对煤体冲击矿压危险性的影响规律进行了模拟研究.结果表明,煤层上方岩层的悬顶长度、岩层厚度和强度对冲击矿压的危险性均有影响.从周期来压步距的一半开始,煤体的冲击危险性显著升高;顶板释放的能量与岩层强度呈对数关系、与顶板厚度呈指数关系,坚硬、厚层顶板岩层相对较软弱、较薄岩层会对煤体产生更为强烈的扰动,致使冲击矿压危险性升高;另外,处于运动态的顶板岩层的诱冲能力远超过处于稳态的顶板岩层.可通过弱化顶板岩层强度、缩短悬顶长度等措施防止或降低冲击危险性,济三煤矿6303工作面通过顶板爆破进行防冲的工程实践证明了研究结果的有效性.The effects of roof stratum＇s physical properties,geometry parameters and movement states on rock burst danger were analyzed by numerical simulation with UDEC4.0 software.The results show that all the roof hanging distance,thickness,and intensity have an effect on coal mass burst.From half of the periodic weighting distance,the risk of coal mass burst increases obviously.The energy released has a logarithmic relation with the intensity of roof stratum,and an exponential relation with its thickness.The harder and thicker roof can generate greater dynamic stress on coal mass,easily increasing the risk of coal mass burst.In addition,the roof stratum in a movement state has a greater effect on rock burst than that in static state.Therefore,countermeasures such as weakening roof stratum intensity and shortening hanging distance can be taken to prevent coal mass from bursting.The roof blasting in NO.6303 working face of Ji-3 coal mine for outburst prevention show that this method is effective.

关 键 词：冲击矿压 顶板岩层 能量 模拟 工程实践 

分 类 号：TD324[矿业工程—矿井建设]