【摘要】 露天煤矿开采的矿坑排水量和水位降深是决定煤矿首采时间的关键问题。利用GMS软件建立了黑龙江省东部宝清露天煤矿首采区三层含水层和两层弱透水层组成的地下水渗流数值模拟模型,再利用实测资料对所建立的模型进行了参数识别和模型验证。在综合考虑经济效益和降水效果的条件下,再利用该模型对不同方案下地下水流场的变化进行了预测,据此提出了露天煤矿首采区最优的布井方案(86眼降水井)及相应的开采量(95718.84m3/d),预测了首采区地下水位的下降过程(平均下降速度为0.17m/d)。更多还原

【Abstract】 Yield of groundwater and its decline process are key issues for the exploitation time of the open-cast coal.Groundwater numerical model including three aquifers and two aquitards is built using GMS in the Baoqing open-cast coal in the Eastern Heilongjiang Province.The model is calibrated and validated according to measured data.Considering both economic benefits and dewatering effect,the flow field of different schemes are predicted by the model.Based on the result the best scheme of dewatering well design (86 dewatering wells) and the corresponding yield of abstraction(95 718.84 m3/d) are determined.The process of groundwater level decline in the first exploiting region is presented too,the average decline speed in 0.17 m/d.The result provides technical support for solving practical key problems in dewatering projects such as number of dewatering wells and their location design,yield of single well,and the prediction of decline speed of groundwater level.更多还原