煤炭工程 ›› 2019, Vol. 51 ›› Issue (2): 70-74.doi: 10.11799/ce201902017

• 研究探讨 • 上一篇    下一篇

孤岛煤柱回采技术参数对下伏大巷围岩稳定性影响研究

王志强1,苏越2,宋梓瑜3,徐春虎2,苏泽华1   

  1. 1. 中国矿业大学(北京)资源与安全工程学院
    2. 中国矿业大学(北京)
    3. 中国矿业大学(北京)资源学院
  • 收稿日期:2017-11-29 修回日期:2018-01-19 出版日期:2019-02-20 发布日期:2019-03-19
  • 通讯作者: 苏越 E-mail:1163648570@qq.com

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

  • Received:2017-11-29 Revised:2018-01-19 Online:2019-02-20 Published:2019-03-19

摘要: 针对孤岛煤柱回采技术参数对下伏大巷围岩塑性区破坏范围的影响展开研究。首先对孤岛煤柱回采技术参数,包括煤柱留设尺寸、开采厚度、推进速度以及超前卸压回采对下伏大巷围岩稳定性进行计算分析,得到保证大巷稳定性的最优技术参数,即:留设3m护巷煤柱、整层开采、日进尺3m以及回采时采用超前卸压措施。并根据最优回采技术参数条件下大巷围岩塑性破坏呈现出的“X”型这一现象,确定大巷的重点支护区域,提出新的支护方案与参数。最后,对孤岛煤柱采动影响下的大巷支护效果进行计算分析。结论表明,与原始状态相比,孤岛煤柱采后的大巷围岩变形较小,利于维护。

关键词: 孤岛煤柱, 回采技术参数, 下伏大巷, 围岩稳定性

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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