采矿与安全工程学报 ›› 2014, Vol. 31 ›› Issue (6): 857-862.

• 论文 • 上一篇    下一篇

特厚煤层长壁巷式胶结充填开采技术研究与应用

  

  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.内蒙古自治区煤炭工业专业技术服务中心,内蒙古 呼和浩特 010020
  • 出版日期:2014-11-15 发布日期:2014-12-01
  • 作者简介:邓雪杰(1989—),男,山西省大同市人,博士,从事充填采煤与岩层控制等方面的研究。 E-mail:dengxuejie_209@163.com Tel:15152450907
  • 基金资助:

    国家“十二五”科技支撑计划项目(2012BAB13B03);中国矿业大学创新人才科研基金项目(2013RC01);江苏省产学研前瞻性联合研究项目(BY2012082)

The research and application of longwall-roadway cemented backfilling mining technology in extra-thick coal seam

  • Online:2014-11-15 Published:2014-12-01

摘要: 针对特厚煤层采出率低、“三下”及其他特殊地质条件下特厚煤层采场围岩移动破坏与地表沉陷控制困难的问题,提出了特厚煤层长壁巷式胶结充填开采技术。在研究特厚煤层长壁巷式胶结充填开采技术原理的基础上,系统阐述了该技术的开采系统布置、主要设备与巷式充填开采工艺;并对胶结充填材料的组成及其承载特性进行了研究,确定了适用于工程现场的充填材料干料配比为粉煤灰35%、白灰渣10%、水泥2%、矸石53%,料浆质量分数为79%,该配比充填材料单轴抗压强度可达1.8 MPa。现场工程应用表明:该技术充实率可达96.1%,开采21 m厚的煤层地表下沉最大值为265 mm,地表下沉系数仅为0.012 6,应用效果良好。

关键词: 特厚煤层, 上行分层, 长壁巷式充填开采, 胶结充填, 绿色开采

Abstract: In this paper, the longwall-roadway cemented backfilling mining technology is proposed to solve the engineering technical problems in extra-thick coal seam, such as low recovery rate and the difficulty in controlling the mining surface subsidence and overlying strata movement and deformation. Systematically, its layout of filling mining system, main equipment and technics are explained based on studying the principle of longwall-roadway cemented backfilling mining technology in extra thick coal seam. Moreover, the composition and bearing characteristics of the backfilling materials are studied to determine the optimal ratio of cemented filling materials which is well applied to field work, namely the optimal proportion of fly ash, lime slag, cement and gangue are 35%, 10%, 2% and 53% respectively. Furthermore, the slurry concentration is 79% and its uniaxial compressive strength can reach 1.8 MPa. The field engineering application shows that the filling ratio can reach 96.1% and the maximum surface subsidence value is 265 mm when mining 21 meter thick coal seam, namely the surface sinking coefficient is only 0.012 6, which shows an excellent application effects.

Key words: extra-thick coal seams, upward slicing mining, longwall-roadway backfilling mining, cemented backfilling, green mining