Evolutionary characteristics of stability of tower line system of corner tower of extra-thick coal seam mining under thick hard overlying rock
Difficulty in ensuring the stability of surface towers after mining huge thick coal seams,and a clear and reasonable mining scheme has become the key to efficient mining and tower body stability of giant thick coal seams.Taking 2311 working face of corner tower under pressure coal mining in Cuijia-gou coal mine as the engineering background,the influence of mining of huge thick coal seam on the stability of surface special structure of corner tower under the condition of thick and hard overburden rock is studied.The results show that horizontal movement and inclination have the greatest influence on the mechanical properties of the corner tower line structure.The over-representation of hard overburden in the overburden rock leads to the specificity of the value of the subsidence coefficient.The inverse pre-diction model of subsidence parameters trained with measured data has high accuracy in predicting values.The stability evolution characteristics of the tower line body are elucidated by the length and loca-tion of the thickness-limiting section in the mining plan.Among them,there are threshold values for the length and location of the thickness-limiting section,and the stability requirements of the tower line body cannot be met even if they are smaller than the threshold values.The stability evolution characteristics of tower line body under different mining depths are similar,but the range of values shows a nonlinear rela-tionship.The study is of guiding significance for the pressure coal mining under similar towers,the im-provement of coal extraction rate and the control of subsidence.
coal mining under"three-body"tower line systemthick hard overlying rocksubsidence anticipationsurface deformation monitoring
万方数据
维普
