煤炭工程 ›› 2018, Vol. 50 ›› Issue (11): 38-42.doi: 10.11799/ce201811010

• 施工技术 • 上一篇    下一篇

沿空留巷关键块大跨距下充填体参数的确定

李成海,柏建彪,王襄禹   

  1. 中国矿业大学
  • 收稿日期:2018-05-18 修回日期:2018-08-24 出版日期:2018-11-20 发布日期:2018-12-25
  • 通讯作者: 李成海 E-mail:lchai2016@163.com

Determination of the Parameters of Filling Wall Based on Large Span of Critical Rock Block in the Gob Side Entry Retaining

  • Received:2018-05-18 Revised:2018-08-24 Online:2018-11-20 Published:2018-12-25

摘要: 针对我国煤炭开采中存在资源浪费大、利用率低等问题,分析了沿空留巷技术中关键块大跨距断裂特征,研究选择了合理充填体强度与宽度。并以山西省兴无矿为例,分析中厚煤层关键块大跨距断裂机理,理论推导充填体静载荷公式,利用UDEC2D软件模拟分析不同宽度、强度充填体的变形规律,基于横向位移、轴向位移、轴向应力和经济效益等衡量标准对不同方案进行对比分析。研究结果表明,当充填体强度为12MPa、宽度为1.2m时,巷道围岩得以稳定控制。

关键词: 沿空留巷, 关键块, 大跨距断裂, 充填体, 数值模拟

Abstract: There are many problems of coal mining in China, such as large waste of resources, low utilization rate and so on. Gob-side entry retaining technology has advantages in non-chain pillar entry protection and green safe mining. It is an important improvement of gob-side entry retaining technology to study the large-span fracture characteristics of critical block and select reasonable strength and width of filling wall. Taking Xingwu coal mine in Shanxi Province as an example, the long-span fracture mechanism of key blocks in medium-thick seam is analyzed, and the static load formula of filling wall is derived theoretically. UDEC2D software is used to simulate and analyze the deformation law of filling wall with different width and strength. Based on the criteria of lateral displacement, axial displacement, axial stress and economic benefit, the different schemes are compared and analyzed. The results show that the surrounding rock of roadway can be controlled stability when the filling wall strength is 12 MPa and the width is 1.2 m.

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