矸石充填体振动推压过程的颗粒流模拟研究  

Numerical simulation of the particle flow during the vibration,pushing,and pressing procedure of the backfilling body

作　　者：黄志敏[1,2] 马占国[2] 张雷[1,2] 杨党委[2] 郭树海[2] 刘道平[2] HUANG Zhimin MA Zhanguo ZHANG Lei YANG Dangwei GUO Shuhai LIU Daoping(School of Physics, China University of Mining ＆ Technology, Xuzhou, Jiangsu 221116, China State Key Laboratory for Geomechanics ＆ Deep Underground Engineering, China University of Mining＆Technology, Xuzhou, Jiangsu 221116, China)

机构地区：[1]中国矿业大学物理学院,江苏徐州221116 [2]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116

出　　处：《采矿与安全工程学报》2017年第4期789-794,共6页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51323004;51074163;51674250);国家自然科学基金重点项目(50834005);教育部新世纪优秀人才支持计划项目(NCET-08-0837);江苏省科技厅科技项目(BY2013019-07);中央高校基本科研业务项目(2012QNA53);深部岩土力学与地下工程国家重点实验室开放基金项目(SKLGDUEK1409)

摘　　要：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。To improve the density degree of the gangue backfills during the fully mechanized filling process,with the Particle Flow Code（PFC2D） program,the gangue backfills models were established,and the influence of the vibration on the compaction effect in the processing of fully mechanized backfilling mining was studied.The results have shown that the introduction of vibration mechanism into the pushing and pressing procedure of self-ramming backfilling hydraulic support can effectively slow down the stress increasing rate of the ramming structure;with the vibration mechanism,the same stress can make the ramming structure travel more distance and thus significantly improve the density degree of the backfills.The increase in the frequency or amplitude of the ramming structure can enhance the flowability of the granular system and the interparticle pore filling.Therefore the pressure of the ramming structure is dispersed to the whole backfilling body quickly,which decreases the stress of ramming structure and the porosity of backfilling body,and improves the ramming effect.

关 键 词：矸石充填体 颗粒流 振动 压实 力链 

分 类 号：TD821[矿业工程—煤矿开采]