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为提高综采充填过程中矸石充填体的密实程度,利用颗粒流PFC2D程序,建立了矸石充填体模型,研究了振动对充填体压实效果的影响。结果表明,在充填支架推压板推压过程中,引入振动机制,能有效减缓推压板的应力增加速度,在相同应力下,使推压板行进更大的距离,大大提高充填体密实性。增大频率或振幅均能增强颗粒体系的流动性和颗粒间孔隙填充,从而迅速将推压板的压力分散到整个体系中,降低推压板应力和孔隙率,提高夯实效果。
In order to improve the compaction degree of gangue filling body during the process of filling with fully mechanized mining, a model of gangue filling body was established by using the particle flow PFC2D program and the influence of vibration on the compaction effect of filling body was studied. The results show that the introduction of vibration mechanism during the pressing process of the filling bracket can effectively reduce the stress increase speed of the pressing plate, and make the pressing plate travel a greater distance under the same stress, greatly improving the compactness of the filling body. Increasing the frequency or amplitude can enhance the fluidity of the particle system and the inter-particle pore filling, so that the pressure of the pressing plate can be quickly dispersed into the whole system to reduce the stress and porosity of the pressing plate and improve the compaction effect.