河南新密地区岩溶水特征及构造控水研究

Characteristics of karst water and study on water-controlling structures in the Xinmi area,Henan Province

岩溶水是新密市城市供水的主要水源,也是区内二1煤开采和煤下铝土矿开采的主要充水来源。由于近年降水偏少、矿山开采大量抽排地下水,导致区域地下岩溶水水位逐年下降,至2013年,新密市供水已出现供水紧张局面。文章通过对该区岩溶发育规律、岩溶水分布特征以及构造对区域岩溶水的控水作用研究,确定奥陶系灰岩是该区地下岩溶水的主要赋存层位;背斜的倾伏端与断裂的交接部位是地下岩溶水的富集地段;断层带附近构成地下水的强径流带和富集带,断层带两侧均富水;大隗断层对区域地下水的影响最为显著,将该区完整的水文地质单元分为两个水文地质亚区。这一研究可为新密市供水、矿山排水、充分、合理利用有限的水资源提供科学依据。

The karst water is the main source of the urban water supply in Xinmi area,Henan.Also it provides the filling water for the No.Ⅱ-1 coal mining area and underlying bauxite mining below the coal layer in the area.In recent years,due to less rainfall and pumping too much groundwater during mining operation,the underground karst water level decreased year by year within the region.By 2013,Xinmi city has faced the urgent situation of water supply shortage.Based on the regularities of karst development in the region,distribution characteristics of karst water and study on structural control on the regional karst water,the authors propose that the Ordovician limestone is the main water-bearing horizon of the karst groundwater; The junction part of anticline plunging end and fracture is the enrichment zone of the underground karst water.Nearby the fault zone is the strong runoff zone and underground water enrichment zone,underground water occurs on both sides of the fault zone.The Dawei fault has a significant effect on the regional groundwater,which divided the hydrogeological unit of the area into two sub hydrogeological units.This study result can provide reliable scientific basis for water supply,mine drainage,sufficient and reasonable use of limited underground water resources for the city of Xinmi.