煤炭工程 ›› 2014, Vol. 46 ›› Issue (10): 146-148.doi: 10.11799/ce201410042

• 研究探讨 • 上一篇    下一篇

巨厚冲积层薄基岩综放开采覆岩移动规律

张东升1,范钢伟1,张帅1,张鑫2,王红3   

  1. 1. 中国矿业大学
    2. 徐州中国矿业大学
    3.
  • 收稿日期:2014-01-13 修回日期:2014-03-14 出版日期:2014-10-10 发布日期:2014-10-10
  • 通讯作者: 张东升 E-mail:dshzhang123@126.com

Overburden movement response top-coal caving under ultra-thick alluvium and thin bedrock

  • Received:2014-01-13 Revised:2014-03-14 Online:2014-10-10 Published:2014-10-10

摘要:

巨厚冲积层薄基岩条件下,综放开采工作面经常出现异常来压,给顶板控制提出了较大的挑战。通过数值计算的方法,分析了600 m厚冲积层、不同基岩厚度条件下的顶板变形破坏特征,得出基岩厚度小于120 m时,覆岩可能出现全厚切落现象;揭示出巨厚冲积层在运动变形过程中具有整体性且难以形成稳定的强承载结构;现场实测出了工作面异常来压规律,证明了巨厚冲积层和薄基岩结构间的关系。该研究成果为类似条件下的综放面安全高效开采提供了借鉴。

关键词: 综放开采, 巨厚冲积层, 深埋煤层, 薄基岩, 支护阻力

Abstract:

Top-coal caving face always suffered abnormal roof weighting under the condition of ultra-thick alluvium and thin bedrock, which is a great challenge for roof control. Numerical calculation was employed to analyze the roof failures under the different condition with 600-m-thick alluvium and different bedrock thicknesses. The results show that all the overburden may shear off if the bedrock thickness is less than 120 m; the thick alluvium is a whole structure in deformation but difficult to form a stable bearing structure. The filed investigation presented the abnormal roof weighting and proved the relation between the thick alluvium and the thin bedrock. The achieves provide a reference for mining safety under similar conditions.

Key words: Top coal caving, ultra-thick alluvium, deep coal seam, thin bedrock, support resistance