陕北凉水井煤矿古河道分布及其对矿井涌水量的影响

Paleochannels Distribution and Impact on Mine Water Inflow in Liangshuijing Coalmine,Northern Shaanxi

为研究陕北侏罗纪煤田榆神矿区凉水井煤矿基岩顶面古河道控水规律,从地质及水文地质条件分析,并结合采动覆岩破坏,研究了4-2煤上覆岩层空间分布特征、导水裂隙带发育、基岩顶面古河道及其控水规律。结果表明,4-2煤为典型浅埋薄基岩煤层,基岩和沙层东薄西厚,土层基本全区分布,局部有条带状缺失。根据基岩顶面形态、土层缺失区,研究圈定了基岩顶面古河道,划分为有沙层充填的古河道和无沙层充填的古河道;工作面跨古河道开采"前-中-后",涌水量表现出"稳定-突增-稳定"的规律,有沙层充填的古河道区涌水量增大幅度明显高于无沙层充填的古河道区。古河道控水规律研究为榆神矿区浅埋薄基岩煤层开采矿井涌水危险性评价提供一种新思路,可为古河道发育区矿井防治水工作提供一定地质依据。

To study bedrock surface paleochannel water control pattern in the Liangshuijing coalmine,Yushen mining area,Jurassic coal field,northern Shaanxi,from geological and hydrogeological conditions combined with mining overburden destruction have analyzed coal No.4-2 overburden spatial distribution features,water conducted fissure zone development,bedrock surface channels and their water control pattern.The result has shown that the coal No.4-2 is typical shallow buried thin bedrock coal seam,bedrock and sand layer thickening from east to west,soil layer basically distributed in whole area,locally banded hiatus.According to bedrock surface configuration and soil hiatus area have delineated bedrock surface paleochannels,and partitioned into paleochannels have sand layer filling and without sand layer filling.During paleochannel area coal mining"earlier-middle-later"stages,water inflow shows"stable-uprush-stable"pattern;water inflow increasing extent in where sand layer filled paleochannel is obviously larger than where without sand layer filled paleochannel.The study on paleochannel water control pattern has provided a new thinking for Yushen mining area coal mining mine water inrush hazard assessment,and provided certain geological basis for paleochannel developed mine area water control works as well.