神南矿区浅埋煤层群开采顶板结构类型判别

Discrimination of roof structure types in shallow coal seams mining in Shennan mining area

为探索浅埋煤层群开采条件下顶板关键层的结构类型,获得科学有效的浅埋煤层群顶板结构形态的判别方法,以神府煤田所属的神南矿区为研究对象,采用理论分析、物理模拟及现场实测相结合的方法,揭示了顶板结构形成的基本条件,确定了顶板结构的判别方法,给出了浅埋煤层群的科学定义。研究发现,上、下煤层间的间隔岩层关键层随采动的破断是影响煤层群下煤层开采矿压显现的主要因素,不同煤岩组合条件下的间隔岩层关键层的位置及结构形态不同。根据研究区煤岩空间组合关系,通过现场探查和理论分析与计算的方法,对研究区煤层群赋存类型进行了划分。通过引入间采比的概念(GC),提出了间隔岩层关键层的判别方法,确定了间隔岩层的关键层单一关键层、双关键层和无典型关键层3种基本结构类型,并对研究区浅埋煤层群进行了科学分类,为现场的安全、高效开采奠定了理论基础。

In order to explore the structural types of the key strata of the roof under the mining conditions of the shallow coal seam group,a scientific and effective discrimination method of the roof structural form of the shallow coal seam group should be obtained.Taking Shennan mining area of Shenfu coalfield as the research object,by using the theoretical analysis,physical simulation and field measurement method,the basic conditions for the formation of roof structure were revealed,the discrimination method of roof structure is determined,and the scientific definition of shallow seam group was given.The research shows that the key layer between the upper and lower coal seams is the main factor affecting the strata behavior of the lower coal seam,and the key layer position and structure shape were different under different coal rock combination conditions.According to the coal-rock spatial combination in the study area,the occurrence types of coal seam groups were divided by means of field exploration and theoretical analysis method.By introducing the concept of interval mining ratio(G C),the discriminant method and types of the key layer of the interval strata were determined,and the shallow coal seams in the study area were classified scientifically,which lays a theoretical foundation for the safe and efficient coal mining.