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为研究水平采空区群的水平动力响应规律,将其转化成有限多自由度离散振动体系,建立水平采空区群离散多自由度动力响应模型。考虑到围岩中的能量耗散(外部阻尼),引入耗损因子p,对动力响应模型进行修正。通过单层水平采空区群间柱爆破及多层水平采空区群顶板矿震2种工况,利用数值模拟对动力响应修正模型的合理性进行验证,并与未修正模型进行对比分析。结果表明,未修正模型和修正模型均能较好地对瞬时性和持续性动荷载做出响应;耗损因子p的取值主要取决于岩体内能量的传递路径和传递距离,单层与多层水平采空区群的赋存条件对耗损因子p的取值影响不明显;修正模型较未修正模型能更好地拟合数值模拟结果,一定程度上揭示了水平采空区群的动力响应规律,为水平采空区群的水平动力响应分析提供了一种新的有效途径。
In order to study the horizontal dynamic response of horizontal gob-quarry group, it is transformed into a finite multi-degree-of-freedom discrete vibration system and a dynamic multi-degree-of-freedom dynamic response model is established. Taking into account the energy dissipation in the surrounding rock (external damping), the wear factor p is introduced to correct the dynamic response model. The reasonableness of dynamic response correction model is verified by numerical simulation through two kinds of working conditions of single column horizontal mined-out group blasting and multi-layer horizontal mined-out group roof mining, and compared with the unmodified model. The results show that both the unmodified model and the modified model can respond well to momentary and sustained dynamic loads. The value of the wear factor p depends mainly on the energy transfer path and transmission distance in the rock mass, The influence of the condition of the horizontal gob group on the value of the wear factor p is insignificant. Compared with the unmodified model, the modified model can better fit the numerical simulation results and reveal the dynamic response of horizontal gob group Which provides a new effective way for horizontal dynamic response analysis of horizontal goaf.