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《Engineering Mechanics》 2017-12
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THE TWO-PHASE FLOW OF WATER-SAND INRUSH UNDER SHALLOW COAL SEAM MINING: A COUPLED NUMERICAL STUDY

ZHONG Jiang-cheng;ZHOU Hong-wei;ZHAO Yu-feng;LIU Ya-qun;YI Hai-yang;XUE Dong-jie;School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing);State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology (Beijing);Institute of Geotechnical Engineering, Technische Universit?t Bergakademie Freiberg;Proving Ground for Construction Machinery & Refit Military Vehicles of CAM;  
In order to study the flow performance of mixed water-sand two-phase flow of the overlying water bearing loose bed under the shallow coal seam mining, a coupled numerical method based on discrete element software PFC3 D and finite element software GID is used to simulate the whole processes of water-sand inrush in precast ideal fracture with different opening widths and dip angles in overlying rock strata. The analysis of the contact force of the fracture channel, flow velocity of water and the drag force between water and sand variation law along with time steps show that, the opening widths and dip angles of fracture change the flow patterns of water-sand flow inrush, and have great impact on the contact force of the fracture channel, flow velocity of water and the time of mixed water-sand flow. However, the drag force is mainly influenced by the dip angles of fissure channel. The fracture channel entrance is the most dangerous position, where has the largest contact force in the process of water-sand coupled flow. The final flow velocity of water and the time steps to stabilize the water velocity in the fissure are in linear correlation with the fracture angles and the fracture opening widths, respectively. The drag force is greater and water-sand inrush is more intense in dip side than underside of the fissure channel.
【Fund】: 国家重点研发计划项目(2016YFC0600704);; 高等学校博士学科点专项科研基金项目(博导类)(20130023110017);; 国家自然科学基金项目(51134018)
【CateGory Index】: TD745.2;TD823
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