采矿与安全工程学报 ›› 2013, Vol. 30 ›› Issue (5): 692-698.

• 论文 • 上一篇    下一篇

五阳矿煤层上山围岩控制原理与支护技术

  

  1. 1.中国矿业大学矿业工程学院,深部煤炭资源开采教育部重点实验室,江苏徐州 221116; 2.中国矿业大学(北京)资源与安全工程学院,北京 100083; 3.湖南科技大学能源与安全工程学院,湖南湘潭 411201
  • 出版日期:2013-09-15 发布日期:2013-10-01
  • 作者简介:袁永(1983-),男,河南省泌阳县人,博士,讲师,从事采矿方法与岩层控制方面的研究。 E-mail:yy20062006@163.com Tel:15862169239
  • 基金资助:

    高等学校博士学科点专项科研基金新教师类资助课题(20120095120017),江苏高校优势学科建设工程资助项目(SZBF2011-6-B35)

Support technology and controlling principle of surrounding rocks of coal rise entry in Wuyang mine

  • Online:2013-09-15 Published:2013-10-01

摘要: 以五阳矿为工程背景,通过三轴压缩围压分级长时加载试验得到了顶板岩石的力学性质,模拟分析了有支护巷道围岩的黏弹性力学性能,提出控制煤层上山变形的围岩控制原则,并进行了支护实践。研究认为:巷道围岩变形是一个时间过程,荷载在加载一定时间后变形趋于稳定,且其变形稳定时间随加载载荷的增大而呈指数增大;在轴向应变未稳定时增加围压,可有效降低轴向应变速率,即在巷道变形未稳定期间增加围压可加速围岩变形的稳定,防止围岩失稳;顶板采用预应力锚杆、锚索支护后,虽然能有效地控制了顶板变形及塑性区的发展,但是会同时加剧煤帮和煤层底板的变形,即在对顶板进行锚杆、锚索强化支护的同时,必须强化两帮和底板的稳固;适当的应力转移有利于围岩的最终稳定,一次支护分级加载的围岩控制原则对控制厚煤层上山巷道围岩变形效果显著。

关键词: 煤层上山, 分级长时加载, 黏弹性, 固帮强顶

Abstract: Based on engineering practice in Wuyang coal mine, the mechanical properties of roof rock has been obtained by the triaxial compression experiment of confining pressures step longtime loading, and the surrounding rock visco-elasticity property of supporting roadway has been analyzed, and controlling principle of surrounding rock has been proposed for controlling deformation of coal rise entry in supporting practice. Four conclusions were drawn: 1) the surrounding rock deformation of roadway is a time course, the deformation tends to be stable after any load being loaded for a certain period of time, and the time span taken by reaching steady increases exponentially with increasing normal loading; 2) the rate of axial strain can be effectively decreased by raising the confining pressure when the axial strain does not tend to be stable; namely, the stability of surrounding rock deformation can be accelerated by raising the confining pressure when roadway displacement does not tend to be stable to avoid the instability of surrounding rocks; 3) roof deformation and the evolution of the plastic zones can be effectively controlled with prestressed anchor cable, but the deformation of coal side and coal seam floor can be aggravated; namely, the stability of slope of roadway sides and floor must be strengthened when the roof is supported with bolting and rope; 4) the appropriate stress transfer can be beneficial to the ultimate stability of surrounding rock, and controlling principles of step loading of one support is highly effective for controlling surrounding rock deformation of the thick coal seam rise entry.

Key words: coal rise entry, longtime step loading, viscoelasticity, reinforcing side and strengthening roof