School of Energy Engineering, Xi'an University of Science and Technology, Xi'an, 710054, China.
Key Laboratory of Western Mines and Hazard Prevention, Ministry of Education of China, Xi'an University of Science and Technology, Xi'an, 710054, China.
Environ Sci Pollut Res Int. 2020 Apr;27(12):12899-12907. doi: 10.1007/s11356-019-05346-0. Epub 2019 May 11.
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.
中国陕北侏罗纪煤田是世界七大煤田之一。它位于中国西北部干旱地区，水资源匮乏，生态环境脆弱。由于采煤，煤层上的岩层会塌陷和断裂，产生裂缝。穿透的裂缝会导致矿坑突水灾害，并对地下水和地表水造成破坏。条带充填法可以控制导水裂隙带的扩展，保护地下水和地表水免受地下采煤的影响。本文通过离散元数值实验研究了不同条带充填条件对导水裂隙带的影响。研究表明，上导裂隙和下导裂隙的穿透是隔水岩组失稳的直接原因。上导裂隙延伸到一定程度后，会出现下导裂隙。在控制充填条带宽度和抗压强度的条件下，条带充填法能有效防止隔水岩组的上导和下导裂隙穿透，确保地表水系统不受地下采煤活动的影响。
