Strong strata behavior mechanism under long distance overlapping coal pillar: taking multiple coal seams mining of Datong mining area as an example

doi:10.16265/j.cnki.issn1003-3033.2017.03.015

Abstract

Abstract: The paper was aimed at studying the strong strata behavior mechanism for the Datong mining area by numerical simulation and field measurement. Mining stress was analyzed by means of Universal Distinct Element Code (UDEC) numerical simulation software for the mining face under the effect of overlapping pillars. Using high-precision microseismic monitoring methods, the relationship between overburden strata movement and strata behavior was studied . The results show that mining face abutment pressure in the region Jurassic pillars correspond is higher, than that in non-coal pillar region by 25%-33%,that in the Jurassic coal pillar overlap area, the strata behavior under the coupling effect of coal pillar-overburden linkage and coal pillar-mining stress is more intense,that under the combined action of mined-out area and Jurassic overlying strata, the ground pressure of gob-side entry is strong, and that the strong strata behavior of carboniferous mechanized mining caving face is induced by coupling action of mining disturbance, abutment pressure from mined-out area and Jurassic overlapping coal pillar. A technology was developed for controlling strong strata behavior.

Key words: overlapping coal pillar, strata behavior, overlying structure, microseismic monitoring, special thick seam

CLC Number:

X936

ZHU Zhijie, ZHANG Hongwei, CHEN Ying, HUO Bingjie, TANG Guoshui. Strong strata behavior mechanism under long distance overlapping coal pillar: taking multiple coal seams mining of Datong mining area as an example[J]. China Safety Science Journal, 2017, 27(3): 83-88.

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