Optimal location of terminal line in sublevel caving face with suspend-shift support in thinner thick-seam

摘要

According to the geological and mining technical conditions of No.18128 sub-level caving face with suspend-shift support, the first working face of the working area, the distribution laws of abutment pressure were studied by jointly employing FlAG3D numerical simulations and field tests. With the full consideration of these laws and the service time-limit of the mining district, the optimal location of the terminal mining line, should be 60 m away from the W4-B8 track dip, which was 20 m shorter than the 80 m distance deter-mined according to traditional experiences. The retained coal safety pillar for the protect-ing of dips, already proved by the industrial practice, can not only improve the rate of coal recovery and satisfy the subsequent service requirement for the following working faces, but also decrease the maintaining expenditure and thus increase profits.