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Numerical simulation study of strip filling for water-preserved coal mining

机译：水保存煤矿带灌装的数值模拟研究

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摘要

The Jurassic coalfield in northern Shaanxi, China is one of the seven largest coalfields in the world. It is located in an arid region of northwestern China, with poor water resources and fragile ecological environment. Due to coal mining, the rock layers on the coal seam will be slumped and fractured to produce fissures. The penetrated fissures will cause a mine water burst disaster and cause damage to groundwater and surface water. The strip filling method can control the expansion of the diversion fissure zone and protect the groundwater and surface water from the underground mining of coal. In this paper, the effects of different strip filling conditions on the diversion fissure zone are studied by discrete element numerical experiments. The study indicates that the upward-fissure and the downward-fissure penetrations are the direct causes of the instability of the water-blocking rock group. After the upward fissure extends to a certain extent, there will be a downward fissure. Under the condition of controlling the width of the filling strip and the compressive strength, the strip filling method can effectively prevent the upward and downward fissures of the water-blocking rock group from penetrating and can ensure that the surface water system is not affected by the underground coal mining activities.
机译：陕北侏罗纪煤田，中国是世界上七大煤田之一。它位于中国西北部的干旱地区，水资源差和脆弱的生态环境。由于煤炭开采，煤层上的岩层将被坍塌和破碎以产生裂缝。穿透裂缝会导致矿山水爆灾灾害，并对地下水和地表水造成损坏。条带灌装方法可以控制导流裂缝区的膨胀，并保护地下水和地表水免受煤的地下挖掘。本文通过离散元数值实验研究了不同剥离条件对导流裂缝区的影响。该研究表明向上裂缝和向下裂隙渗透是防水岩组不稳定性的直接原因。在向上裂缝在一定程度上延伸后，将有一个向下的裂缝。在控制填充条的宽度和抗压强度的条件下，条带填充方法可以有效地防止防水岩基团的向上和向下裂缝穿透，并且可以确保表面水系统不受影响地下煤矿开采活动。

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