煤炭工程 ›› 2021, Vol. 53 ›› Issue (11): 97-101.doi: 10.11799/ce202111019

• 研究探讨 • 上一篇    下一篇

沿空留巷巷内锚杆支护优化

张剑,刘栋,李洪宾,闫永林   

  1. 1. 中煤科工开采研究院有限公司, 北京 100013 2. 天地科技股份有限公司 开采设计事业部, 北京 100013 3. 煤炭资源高效开采与洁净利用国家重点实验室, 北京 100013
    4. 山西汾西矿业(集团)有限责任公司, 山西 介休 032000
  • 收稿日期:2021-05-27 修回日期:2021-08-20 出版日期:2021-11-20 发布日期:2022-01-05
  • 通讯作者: 张剑 E-mail:363206434@qq.com

Optimization of bolt support in gob side entry retaining

  • Received:2021-05-27 Revised:2021-08-20 Online:2021-11-20 Published:2022-01-05

摘要:

为了提高沿空留巷巷道围岩控制能力, 保障煤矿安全生产, 以曙光煤矿1226沿空留巷为工程背景, 指出留巷原支护存在顶板锚杆锚索同排布置, 锚杆锚索预应力小, 锚索平托板承载力低、不具备让压扩散预应力等主要问题; 提出留巷区域地应力为中等水平构造应力, 巷内支护重点考虑水平主应力方向对顶帮角的影响, 顶板由砂质泥岩和细砂岩组成, 围岩结构对围岩强度影响甚小, 煤帮浅部破碎强度低, 控制留巷煤帮稳定尤为关键; 并优化1228运输巷锚杆支护技术, 即改变留巷顶板锚杆锚索布置方式为隔排间隔布置, 增加锚杆锚索支护强度, 改善锚杆锚索及其附件托板合理配套, 调整锚杆锚索安装角度, 加大锚杆锚索预应力水平, 采用此优化方案取得良好效果。

关键词: 沿空留巷, 锚杆支护, 围岩属性, 锚索托板, 预应力

Abstract:

The control of surrounding rock stability of gob-side entry retaining is a difficult problem that restricts the safe production of coal mine. In view of the present situation of deformation and failure of surrounding rock in gob-side entry retaining at 1226 working face in Shuguang Coal Mine, this paper analyzes that the main problems existing in the original bolt support of gob-side entry retaining, which the roof bolt and anchor cable are arranged in the same row, the pre-stress of bolt and anchor cable is small, and the bearing capacity of the anchor cable flat supporting plate is low and it does not have the function of yield pressure and diffusion prestress. The in-situ stress in the retained roadway area is of medium-level tectonic stress, the influence of the direction of horizontal principal stress on the top and slope angle is considered in the roadway support, the shallow part of coal seam is broken and its strength is low, so it is very important to control the stability of coal side. The paper puts forward and optimizes the bolt supporting technology in the gob-side entry retained in 1228 transport roadway, namely changing the arrangement of roof bolts and cables in the gob-side entry retained to interval arrangement, increasing the support strength of bolts and cables, improving the reasonable matching of bolts and cables and supporting plate, emphasising the vertical installation of anchor bolts, and increasing of the pre-stress level of bolts and cables. Finally, in view of the strong floor heave control in the later stage of roadway retaining, the hydraulic top-cutting method to pressure-relief is suggested.

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