摘要
基于关键层理论,采用相似模拟、数值模拟和理论分析的方法,研究了煤层采高对采动覆岩瓦斯卸压运移"三带"范围的影响规律。结果表明:覆岩中关键层的位置及其在不同采高条件下的移动、破坏形态是煤层采高对瓦斯卸压运移"三带"范围影响的主要原因。在非充分采动条件下,随着采高的变化,卸压解吸带集中在覆岩中尚未发生弯曲破断且下方存在离层裂隙的关键层以下的采空区中部,其最大高度为主关键层所在高度;在充分采动条件下,采空区周围"O"形圈范围内存在大量离层空间,卸压解吸带横向范围缩小至"O"形圈宽度之内,采高与卸压解吸带宽度间呈自然对数函数关系。最后,通过现场工程应用验证了研究结果指导采动瓦斯卸压抽采工程实践的可靠性。
Based on the key strata theory, the similar physical simulation, the numerical simulation and the theoretical analyses are used to study the effect of mining height on the range of the ＂three zones＂ of gas pressure relief and migration in overlying strata due to mining. The results show that the location, the movement and the failure of the key strata under various mining heights are the primary reasons to effect the range of ＂three zones＂ of gas pressure relief and migration in overlying strata. Under the sub-critical mining circumstance, the zone of gas pressure relief is in the middle of goaf where the unbroken key stratum is just over it and the bed separation spaces exist. The maximum height of overlying strata reaches to the bottom of the primary key stratum. Under the critical mining circumstance, the zone of gas pressure relief shrink within the ＂O＂ shape of mine goaf. The mining height has a natural logarithm-mic relationship with the width of gas pressure relief zone. Finally, the reliability of study results is ve-rified in some engineering applications with guiding pressure relief gas extraction work.
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2017年第6期1223-1231,共9页
Journal of Mining & Safety Engineering
基金
煤炭资源与安全开采国家重点实验室开放课题项目(SKLCRSM16KFB08)
国家自然科学基金项目(51474220)
中央高校基本科研业务费专项资金项目(2011QZ03)
关键词
瓦斯卸压运移"三带"
煤层采高
关键层
"O"形圈
煤与瓦斯共采
＂Three Zones＂ of gas pressure relief and migration
mining height
key stratum
＂O＂shape
co-extraction of coal and gas
