考虑静储量释放的矿井涌水量预测方法探讨

Discussion on prediction method of mine water inflow considering satic release

鄂尔多斯盆地周边矿井逐步建成投产,上覆巨厚含水层随着煤层开采,大量持续进入矿井,因矿井设计排水能力不足造成了多起矿井水害事故,尤其是原于勘探阶段仅依据水文钻孔稳定流抽水试验预测矿井涌水量,忽略了矿井实际涌水机理中的静储量释放,预测矿井涌水量偏差较大。针对这一情况,以鄂尔多斯盆地周边纳林河二号井为例,充分利用勘探阶段抽水试验不同阶段获取的水文地质参数,考虑静储量探讨预测矿井涌水量,研究巨厚含水层下矿井涌水机理,并与近年开采实测矿井涌水量情况进行对比分析,验证预测误差率,提高预测结果的精确性,对该区矿井涌水量预测具有参考作用。

With gradual completion of surrounding mine in Ordos Basin, the overlying thick aquifer continued to enter mine along with large amount of coal mining. A number of mine water disasters occurred due to inadequate design of drainage ability, especially mine water inflow quantity in exploration stage was predicted by steady flow pumping test but ignored release of static reserves. Taking surrounding Nalin River No.2 Well as an example and making full use of hydrogeological parameters obtained from stages of pumping test in exploration stage, as well as considering prediction of mine water inflow by static reserves, mechanism of mine water gushing under thick aquifer was characterized and compared with mine water inflow in recent years, error rate was predicted, accuracy of predicted results was improved, which provided a reference for prediction of mine water inflow quantity in the region.