基于弹性独立支座的大采高综采工作面液压支架群组支护应力场理论与应用

Theory and application of supporting stress fields of hydraulic powered support groups in fully mechanized mining face with large mining height based on elastic supporting beam model

根据液压支架承载特性,建立弹性独立支座的液压支架群组岩梁模型,采用离散型单跨梁方法得出液压支架群组刚度与载荷关系矩阵,给出在液压支架作用下岩梁挠度与液压支架群组支护阻力计算公式,推导出液压支架对顶板支护应力场矩阵方程,给出相应的简化计算方法。在此基础上,研究基于不同围岩条件和支架结构的液压支架群组支护应力场分布特性,并给出具体算例,同时指出了该理论的具体使用条件与发展方向。

In this paper, an elastic supporting beam model for powered support groups based on supporting characteristics of powered support is proposed, the stiffness matrix of powered support groups with the method of discrete single span beam is derived, the formulas of deflection of the rock beam and of supporting resistance of hydraulic powered support groups are obtained, the equation of supporting stress field of powered support is established, and a corresponding simplified calculation method is presented. The supporting stress field of powered support in different surrounding strata conditions and structure patterns of powered support are studied and a specific example is described. Finally, the specific conditions of application and direction of development of the theory are put forward.