Study on safety mining height beneath the reservoir and dam in Wangwa coal mine
In order to improve the safety of mining under the reservoir dam and improve the recovery rate of coal resources,110505 working face under the reservoir dam of the Wangwa coal mine was taken as the research background,the development laws of overlying rock fissures and the height of the were studied through methods such as physical simulation,numerical simulation,and theoretical analy-sis.In order to avoid damage to surface dams and water bodies caused by mine mining,a height-limited mining plan was proposed for the mining of the 110505 working face based on the height analysis re-suits of the water-conducting fracture zone.The results show that after the working face is mined,a"concave"basin is formed on the surface,and traction cracks are generated,with the surface water level dropped by 78％;the height of the water-conducting cracks actually obtained on site is 170.76 m;physical simulation experiments,and numerical calculations,the traditional empirical formu-la shows that the heights of the wa-ter-conducting fracture zones of the three are 162 m,164 m and 120.57 m respectively.After the empirical formula was modified by the push-wave correction coeffi-cient,it was deduced that the safe mining height for high-limit mining is 2.6 m.The study reveals the height growth pattern of the water-conducting fracture zones in the overlying rock on the working sur-face and the pattern of the reservoir water body affected by mining,providing a reference for the subse quent formulation of safety measures in Wangwa coal mine under such conditions.
coal mining under reservoirshigh intensity mininggreen miningphysical simulationwa-ter-conducting fracture zone
万方数据
维普
