1. School of Resources and Geosciences,China University of Mining and Technology,Xuzhou　 221116,China;2. State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou　 221116,China;3. Shenhuashendong Group Co. ,Ltd. ,Ordos　 017000, China

采用离散元模拟了垮落带波及到松散砂层时导致的突水溃砂灾害。以神东矿区哈拉沟煤矿22402工作面为原型,采用分形理论分析了垮落带破碎岩体的块度分布特征,并利用离散元方法(DEM)根据破碎岩体的块度分布生成不规则碎石,建立了垮落带破碎岩体溃砂数值模型。模拟结果表明:垮落带破碎岩体间空隙较大且连通性好的通道会形成溃砂优势通道,垮落带残余的空洞空隙可以储存溃落的松散砂;大小不均、堆积混杂的垮落带破碎岩体对溃砂速度具有一定的阻挡作用,松散砂在溃砂通道内流动的速度分布呈纺锤形,通道中间的速度大于壁面的速度。

This paper presents a numerical simulation of quicksand or sand flow hazard through the broken rock mass in the caving zone due to coal mining based on DEM. The panel 22402 of the Halagou Coalmine was taken as the study site in this paper. The fragment-size distribution of caving zone was analyzed by using the fractal theory and then a nu- merical model of quicksand through the broken rock mass of caving zone with random shape was constructed by using DEM according to the fragment-size distribution. The simulation results show that the caving zone with large voids or pores and good connectivity are the dominant pathways for sand migration;the voids and pores in the caving zone can store the aeolian sand. The poorly graded rock mass in caving zone has a certain effect to block the sand flow;the ve- locity profiles of sand flow are of spindle type which mean that the sand flow velocities along the centerline are larger than those near the wall.

国家重点基础研究发展计划(973)资助项目(2013CB227903)；

Liang Yankun,Sui Wanghua,Zhu Tao,et al. Numerical simulation of quicksand through the broken rocks in caving zone due to coal mining based on DEM[J]. Journal of China Coal Society,2017,42(2):470-476.