褶皱构造区开采裂隙发育及压架机理研究

Research on the Development of Mining Fractures and the Mechanism of Fracturing in Folded Structure Areas

为了解决褶皱构造地质煤层压架事故频发的问题,利用数值模拟软件对褶皱构造特征开采覆岩破断及裂隙发育情况进行研究,发现褶皱结构开采裂隙发育大致分为3个区域,分别为裂隙聚集区、裂隙发展区和裂隙起裂区。同时对不同采高、不同工作面长度下的裂隙发育情况进行分析,发现采高和工作面长度与导水裂隙发育高度呈正比,各阶段裂隙发育高度从高至低依次为过向斜后阶段内、过背斜阶段、过向斜阶段、开切眼到背斜爬坡前阶段,最后给出了预防压架事故的具体措施,为矿井高效开采提供依据。

In order to solve the problem of frequent coal seam pressure frame accidents in fold structure geology,this paper uses numerical simulation software to study the characteristics of mining overlying rock fracture and crack development in fold structure mining.It is found that the development of cracks in fold structure mining can be roughly divided into three regions,namely,crack aggregation area,crack development area,and crack initiation area.At the same time,an analysis was conducted on the development of cracks under different mining heights and working face lengths.It was found that the height of water conducting cracks is proportional to the mining height and working face length.The height of crack development in each stage,from high to low,is in the order of passing through the post syncline stage,passing through the anticline stage,passing through the syncline stage,opening the cutting eye to the pre slope climbing stage.Finally,specific measures to prevent pressure frame accidents were provided,providing a basis for efficient mining in the mine.