宝日希勒矿区水文地质条件及地下储水可行性研究
Hydrogeological conditions and feasibility study of underground water storage in Baorixile Mining Area
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摘要: 为了解决宝日希勒露天矿季节性矿坑水富余和用水短缺问题，实现矿区水资源的合理调蓄利用，在对矿区地质、水文地质、构造等条件进行研究的基础上，开展了矿坑水量质特征、典型污染组分处理等方面的研究。结果表明：宝日希勒矿区位于完整的陈旗煤田水文地质单元内，为波状高平原地貌，第四系底板高于区域地下水位，属于透水不含水地层；白垩系大磨拐河组各含水层之间水力联系不明显，煤层是其主要含水介质；受地质构造及古地理环境控制，宝日希勒矿区的东、南、北三面为隔水边界、西部为补给边界，形成了相对封闭的向斜蓄水构造；首采区东侧为一背斜轴部，且发育1条北北西向正断层（F15），由于含隔水层交错，与二采区之间形成了隔水性能较好天然坝体（坝体宽度>200 m），在首采区西侧建设地下储水库，既能保证二采区内排土场和采坑安全，又可以实现首采区西侧有效储水，储水库容可达119.0×104 m3；矿区用水季节性差异较大，冬春季矿坑水富余量为72×104~81×104 m3，矿坑水经混凝沉淀预处理和土壤表层强化处理，将宝日希勒矿坑水中浊度降至水质标准限值，可以实现矿坑水地下储存的量质安全。通过确定安全的地下储水地址，研发科学合理的预处理工艺，实现了宝日希勒矿区矿坑水的有效保护和可持续利用。Abstract: In order to solve the problem of seasonal pit water surplus and water shortage in Baorixile Open-pit Mine and realize the reasonable storage and utilization of water resources in the mine area, based on the study of geological, hydrogeological and structural conditions of the mine area, the water quality characteristics of the mine and the treatment of typical pollution components were studied. The results show that Baorixile Mining Area was located in the complete Chenqi Coalfield hydrogeological unit, it was a wavy high plain landform, and the Quaternary floor was higher than the regional groundwater level, which belongs to the permeable and non-water bearing stratum; the hydraulic connection between the aquifers of the Cretaceous Damoguaihe Formation was not obvious, and the coal seam was the main water bearing medium. Controlled by the geological structure and paleogeographic environment, the east, south and north sides of Baorixile Mining Area are water separation boundaries, and the west was recharge boundary, forming a relatively closed syncline water storage structure. The east side of the first mining area is an anticline axis, and a NNW normal fault （Ｆ15） is developed. Due to the interlacing of aquifers, a natural dam with good water resisting performance （ｄａｍ ｗｉｄｔｈ ＞ 200 ｍ） is formed between the first mining area and the second mining area. The construction of underground reservoir in the west side of the first mining area can not only ensure the safety of dump and mining pit in the second mining area, but also realize the effective water storage in the west side of the first mining area, and the water storage capacity can be increased 119.0 × 104 m3. There is a great seasonal difference in water use in the mining area. The surplus of mine water in winter and spring is 72×104 to 81×104 m3. The turbidity of Baorixile Mine water can be reduced to the limit of water quality standard by coagulation and precipitation pretreatment and surface soil strengthening treatment, which can realize the quantity and quality safety of underground storage of mine water. The effective protection and sustainable utilization of mine water in Baorixile Mining Area are realized by determining safe underground water storage location and developing scientific and reasonable pretreatment process.
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