孤岛煤柱回采技术参数对下伏大巷围岩稳定性影响研究

doi:10.11799/ce201902017

Abstract

Abstract: Abstract：Study of influence of mining technology parameters of island longwall panel on plastic failure mode of surrounding rock of the underlying alleys in this paper. The stability of surrounding rock mass of the main entry with different mining technical parameters for extraction of the island longwall panel including coal pillar sizes, mining height, advance rate and destressing measures were firstly analyzed and computed. The optimal technical parameters for keeping the stability of the main entry were obtained, these are: 3m gateroad coal pillars, full-seam mining , 3m daily advance and destressing measures ahead of working face. According to the phenomenon of "X" in the plastic failure of surrounding rock under the condition of optimal recovery technology, the key supporting area of the main roadway, the new supporting scheme and parameters are determined. Finally, the support effect of the roadway under the influence of the mining of the isolated coal pillar is calculated and analyzed. The conclusion shows that the deformation of the surrounding rock of the main coal pillar is less than that of the original state, which is beneficial to support.

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Influence of technical parameters of isolated coal pillar mining on stability of surrounding rock of lower lying roadway

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