华丰煤矿覆岩离层注浆减沉技术研究

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摘要基于华丰煤矿4#煤层开采的覆岩离层注浆钻孔布置，采用理论分析、区域动力规划与室内相似模拟试验3种方法，分析现有技术受工作面长度短、留设煤柱与巨厚砾岩断裂步距判定有误等因素造成减沉效率低的问题，提出采用覆岩离层连续一体化注浆技术布置倾向注浆钻孔，区域动力规划划分断裂的基础上布置走向注浆钻孔。通过相似模拟试验发现，采用覆岩离层连续一体化注浆技术可改善覆岩采动不充分、煤柱失效造成采空区活化以及砾岩下方受工作面倾斜长度影响难以出现离层等现状。最后，提出在华丰矿巨厚砾岩下方沿倾斜方向布置连续一体化注浆钻孔，在工作面上巷外侧80 m沿走向布置6个注浆钻孔于断裂位置处，并对其进行分析认为，离层区下方岩层的采动程度充分，注浆减沉效率可达到44.6%，多回收煤炭资源9.4×107 kg及沿倾斜方向减少钻孔工程量930 m。

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关键词 ：采矿工程, 覆岩离层, 注浆充填, 采动程度, 减沉效果, 区域动力规划

Abstract：Based on the drilling holes layout of grouting into overburden-separation of #4 coal seam in Huafeng coal mine，theoretical analysis，regional dynamic planning and indoor simulation experiment are employed. By analyzing existing technical problems including the short face length，wrong judgement of coal pillar and rupture steps which can cause low efficiency of reducing subsidence，a new method is issued including arrangement of dip grouting drilling holes with technology of overburden-separation continuous integration grouting and arrangement of strike grouting drilling holes with method of regional dynamic planning. With the result of simulation experiment，it is shown that there are some improvements in aspects of inadequate overburden mining，goaf activation caused by pillar failure and difficult separation below the conglomerate and so on with using the continuous integration technology. Finally，the method of layout of continuous integration grouting drilling holes along the dip direction below greatly thick conglomerate and layout of six grouting holes along the strike direction outside the roadway 80 m of face is employed. And results show that the extent of mining is adequate beneath the separation zone，and the efficiency of reducing subsidence reaches to 44.6% with recycling more than 9.4×107 kg of coal resources，and quantity of drilling work reduces by 930 m along the dip direction.

Key words： mining engineering overburden separation grouting filling mining extent efficiency of reducing subsidence regional dynamic planning

收稿日期: 2012-12-19

引用本文:

王志强，郭晓菲，高运，陈超凡，李鹏飞，王磊，赵景礼. 华丰煤矿覆岩离层注浆减沉技术研究[J]. 岩石力学与工程学报, 2014, 33(sl): 3249-3255.
WANG Zhiqiang，GUO Xiaofei，GAO Yun，CHEN Chaofan，LI Pengfei，WANG Lei，ZHAO Jingli. STUDY OF GROUTING TECHNOLOGY OF OVERBURDEN-SEPARATION TO REDUCE GROUND SUBSIDENCE IN HUAFENG COAL MINE. , 2014, 33(sl): 3249-3255.

链接本文:

http://www.rockmech.org/CN/Y2014/V33/Isl/3249

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