上薄下厚煤层群上行开采可行性研究

Feasibility Study on Upward Mining of Thin Upper and Thick Lower Coal Seam Group

上行开采可有效缓解矿井接续紧张,延长矿井服务年限。以某矿典型的上薄下厚煤层群开采为例,综合采用理论分析、数值模拟等方法对B_(5)煤层上行开采可行性展开研究。结果显示,B_(4)^(2)煤层、B_(5)煤层层间岩层为含单一煤层结构,B_(5)煤层处于在B_(4)^(2)煤层开采后形成的裂隙带范围内,B_(4)^(2)煤层开采后,上覆岩层形成铰接岩梁结构,随着工作面推采,铰接岩梁结构不断向前传递,B_(5)煤层可以保持较好的完整性和连续性。采用4种判别方法对该矿水平采区范围内B_(5)煤层是否具备上行开采的可行性进行验算,明确了B_(5)煤层部分区段具备上行开采的可行性,为高效开采提供了理论依据。

Upward mining can effectively alleviate the tension of mine connection,and prolong the service life of mine.The study takes the typical upper thin and lower thick coal seam group mining as an example;and comprehensively uses theoretical analysis,numerical simulation and other research methods to study the feasibility of upward mining of B_(5) coal seam.The results show that the B_(4)^(2) coal seam and the B_(5) coal seam interlayer rock layer are of single coal seam structures.The B_(5) coal seam is within the fracture zone formed after the mining of the B_(4)^(2) coal seam.After the mining of the B_(4)^(2) coal seam,the overlying rock layer forms a hinged rock beam structure.With the working face mining,the hinged rock beam structure continues to pass forward,and the B_(5) coal seam can maintain good integrity and continuity.4 discriminant methods are used to check whether the B_(5) coal seam in the first level and first mining area of the mine has the feasibility of upward mining.It is clear that some sections of the B_(5) coal seam have the feasibility of upward mining,which provides a theoretical basis for its efficient mining.