关键词: 支承压力, 煤柱, 卸压系数, 集中系数

Abstract:

To the multi coal layers of the mines, this paper researches the 10 m pillar abutment pressure distribution on pillars floor and roof, based on these three pillar sizes that lower pillar greater than or equal to, less than upper pillar were determined, and from three aspects to analysis each pillar on the influence of above pillar pressure relief degree, pillar peak pressure coefficient and at the bottom of the propagation depth. The results show the pillar pressure spread in different forms when in different pillar size combinations, single seam pillar pressure is "8" shape distribution in the roof and floor, however the vertical arrangement of the double seam pillar pressure in the floor with semi-elliptical transmission distribution. When pillar size less than upper pillar, the pillar pressure peak coefficient is low, floor propagation depth is smaller, and the above pillar pressure effect is better. The results for vertical arrangement pillar reasonable choose pillar size and promotion small coal pillar application to provide certain guiding significance.

Key words: abutment pressure, pillar, relief coefficient, concentration factor