急倾斜远距离下保护层开采过程数值模拟及现场应用

Numerical simulation on mining process of steep inclined and long distance protective seam and site application

基于计算机系统的UDEC3.1软件,模拟了K93煤层作为下保护层开采时上覆岩层裂隙演化规律。通过数值模拟分析表明了K93煤层作为保护层的有效性。最后,经现场实地效果考察,得出了K3煤层开采前后,Ka煤层瓦斯压力、钻孔瓦斯涌出量的变化规律。

Base on the UDEC3.1 software of the computer system,the paper simulated and analyzed the crack evolution law of the overlying strata during the mining in No.K93 seam as the underneath protective seam.The simulation results showed that the No.K93 seam have the validity as the protective seam.Finally with the site effect investigation,the gas pressure of No.K7a seam and the borehole gas emission variation law before and after the mining of No.93 seam were obtained.