卸荷煤岩体冲击破坏特性数值模拟研究  

Numerical Simulation Research on Impact Failure Characteristics for Unloading Coal Rock Mass

作　　者：李晓璐 

机构地区：[1]煤炭科学技术研究院有限公司安全分院,北京100013 [2]煤炭科学技术研究院有限公司煤炭资源高效开采与洁净利用国家重点实验室,北京100013

出　　处：《煤矿安全》2015年第6期43-45,共3页Safety in Coal Mines

基　　金：国家重点基础研究发展规划(973计划)资助项目(2010CB226806);国家自然科学基金资助项目(51404140;51304117)

摘　　要：为了探讨卸荷煤岩体在不同类型载荷作用下的围岩稳定性规律,对卸荷煤岩体在静载、动载和动静载下的冲击特性进行了数值模拟分析。研究结果表明:冲击动载对卸荷煤岩体冲击破坏的影响主要在于冲击波的循环扰动作用,冲击波的循环扰动作用不仅使巷帮煤层发生层裂破坏,而且造成顶部大范围的劈裂破坏;载荷作用的速率对卸荷煤岩体的冲击特性影响作用明显,主要体现在卸荷煤岩体的破坏载荷峰值、破坏区域和破坏类型等方面的显著不同;动静载耦合作用对卸荷煤岩体冲击特性的影响远高于单一的静载或动载。In order to investigate the law of surrounding rock stability for unloading coal-rock mass under different loads,the numerical simulation was carried out to analyze impact properties of unloading coal-rock mass when subjected to static load,impact dynamic load and superposition of static-dynamic load. The results showed that the influence of impact loading on the impact failure of unloading coal-rock was mainly the cycle disturbance of shock wave,the distribution effect not only caused spalling failure in coal seams of tunnel sides,but also led to splitting failure in top strata at large range. The influence of loading rate on the impact characteristics of unloading coal-rock mass was significant,the obvious difference included the peak of failure load,the failure regions,and the failure types,etc. The influence of static and dynamic load coupling was larger than that of single one on impact properties of unloading coal-rock mass.

关 键 词：三维数值模拟 卸荷煤岩体 冲击特性 冲击波 动静载耦合 

分 类 号：TD324[矿业工程—矿井建设]