应力波作用下巷道围岩层裂失稳的数值模拟

Numerical Simulation of Layered Crack and Failure of Roadway Surrounding Rock Under the Action of Stress Wave

片帮型冲击矿压使煤壁局部失稳,它与煤壁层裂板结构的形成有关.为了分析巷帮层裂结构形成的影响规律,采用LS-DYNA软件,对扰动应力波作用下巷帮围岩层裂破坏结构的形成过程、顶板的岩性对层裂结构形成的影响进行了有效的数值模拟.研究得到了巷道围岩在一定应力状态下巷帮围岩层裂结构的形状、厚度等特征.顶板的性质决定了是否形成巷帮层裂结构及其层裂结构的范围大小及层裂板的稳定性.研究结果对揭示煤矿冲击矿压的诱发机理,以及采取有效的防治技术措施具有重要意义.

The rib spalling rock burst in coal mines makes a local instability of coal wall during excavation, which is related to layer-crack-plate structure. In order to analyze the rule of form- ing the layer-crack-plate structure, we numerically simulated the forming process of the layered crack and failure structure and the effect of roof lithology on forming this structure by using the software LS-DYNA, and obtained the shape and thickness the layered crack structure of the surrounding rock in the roadway-rib. The result shows that 1）the roof lithology is an important factor to form layered crack and failure structure and induce the rock burst, and 2） the roof lithology is closely related to the formation of layered crack and failure structure and to how large area of this structure will be. This result is significant for studying mechanism of inducing rock burst and for taking effective measures to control it.