液压支架群组支护原理与承载特性

Supporting principle and bearing characteristics of hydraulic powered roof support groups

根据液压支架支护特性,建立液压支架群组弹性基础梁力学模型,得出顶板挠度与支护阻力解析关系式,在此基础上研究不同巷帮条件、支架刚度、顶板岩性、岩厚、采高等参数对顶板下沉量和液压支架支护阻力的影响,分析支架上方顶板来压特性与工作面长度的关系,解释普通长度工作面顶板来压特性以及超长工作面顶板来压规律。实例表明,基于弹性基础梁的液压群组计算模型具有实用价值,可以揭示液压支架群组支护阻力以及工作面支架上方顶板挠度变化情况与岩层破断规律。

According to the supporting characteristics of powered support, this paper constructed the elastic foundation-beam model where the powered support groups are treated as elastic foundation, derived the formula of supporting resistance and roof deflection. Based on which, this paper studied the key parameters, such as the different stiffness of powered support, roof rock, roof thickness, mining height, beam end conditions and so on, how to influence the roof subsidence displacement and supporting resistance, analyzed the relationship between the roof deflection and the length of the mining face, and explained the pressure characteristics of the normal length mining face and the pressure law of the super length mining face. Results show that the elastic foundation calculation model has practical value, it can reveal the supporting resistance of powered support groups, calculate the change of roof deflection and explain the law of roof rock broken.