大海则煤矿超大采高工作面片帮治理技术研究

Study on Treatment Technology of Extra Large Mining Height Face Seam in Dahaize Mine

通过对脆性煤层工作面煤壁片帮的机理和影响因素分析,并运用PFC软件对回采过程进行离散元数值模拟分析,对超大采高回采过程中可能形成的片帮情况以及片帮规模有了定量的预测。明确了大海则煤矿大采高工作面片帮属于典型的拉张型板裂破坏,与煤岩层的受力、结构的变形、煤岩物理力学性质有关。制定了采用提高围岩支护强度,提升煤体强度,优化液压支架结构设计,改进回采工艺以及保证煤层节理与煤壁倾向的综合治理技术方案,来减少煤壁片帮。

Through analyzing mechanism and influencing factors of the brittle coal working face coal wall, and using PFC software to simulate discrete element analysis of the process of mining, there is quantitative prediction in the situation about the formation of wall caving in the process of extra large mining height and spalling scale. It is clear that the working face of mining height in coal mine belongs to typical tensile fracture failure, which is related to the stress of coal and rock strata, the deformation of structure and the physical and mechanical properties of coal rock. The formulation is adopted to improve the surrounding rock supporting strength, improve coal strength, optimize the structure of hydraulic support design, improve the mining process and ensure the comprehensive treatment scheme of coal bed joints and coal wall inclination, to reduce the coal wall spalling.