摘要
我国西北地区浅埋厚煤层开采对地表及潜水层造成严重破坏,而充填开采是减小地表破坏以及实现保水开采的有效途径。为研究浅埋厚煤层条带充填保水开采的安全性,以哈拉沟煤矿为研究对象,建立了"边界煤柱+条带充填体+覆岩"的力学模型,采用相似试验与现场实测相结合的方法,在周期来压步距、地表下沉及台阶裂缝等方面进行对比分析,得出了较为准确的基岩裂缝角及直接顶初次垮落步距,并通过对隔水层的稳定性分析,确定了条带充填开采的充填宽度为38 m,充填间隔为16 m。根据土工试验得到黄土层的相关力学参数,确定了下行裂缝的发育深度。结果表明:条带充填开采引起的下行裂缝未影响到主关键层,有效隔水岩组厚度满足相关规程要求,可实现安全保水开采。
Shallow buried thick coal seam mining caused serious surface subsidence and phreatic water loss in northwest China. Strip filling mining is an effective way to reduce surface damage and achieve water preserved mining.In order to study the safety of strip-filling in water preserved mining under shallow buried thick coal seam,the Halagou coal mine had been chosen to be the research field. The mechanical model of"Boundary pillar + Strip-filling body + Overburden"had been established. The physical simulation and field measurement method were compared and analyzed from the aspect of the periodic weighting step,the maximum surface subsidence and step fissure. The crack angle in the bedrock and first direct roof caving step were obtained. Meanwhile,according to the analysis of the water resisting strata,it can be determined that the filling width of strip-filling was 38 m,and filling interval was 16 m.According to the soil test,the mechanical parameters of the loess layer were obtained,and the development depth of downward crack was determined. Furthermore,the development height of upward crack was also obtained through the numerical simulation. The results demonstrate that the primary key stratum was not affected by the downward crack caused by strip-filling mining,and it meets the requirement of Chinese regulations. Therefore,it can realize the safety of water preserved mining.
作者
白二虎
郭文兵
谭毅
杨达明
郭明杰
Bai Erhu;Guo Wenbing;Tan Yi;Yang Darning;Guo Mingjie(School o f Energy Science and Engineering,Henan Polytechnic University,Jiaozuo,Henan 454000,P.R.China;Collaborative Innovative Center of Coal Safety Production in Henan Province,Jiaozuo,Henan 454000,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2019年第4期1225-1231,共7页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金(51774111)
河南省科技创新杰出人才项目(184200510003)
关键词
浅埋厚煤层
条带充填
保水开采
隔水关键层
shallow buried thick coal seam
strip-filling
water preserved mining
water resisting key strata
