河南夹沟铝土矿床突水机理与防治方法研究

A study of the mechanism of water inrush and prevention measurements of the Bauxite Aluminium ore in Jiagou,Henan

文章建立了河南夹沟铝土矿床“二元”突水概念模型,揭示了突水水源来自两个不同的渗流场:矿床上部石炭系(C3)含水岩组渗流场、矿床下部奥陶系(O2)含水岩组+寒武系(∈2+3)含水岩组渗流场。前者以重力自由渗流为突水力源,以裂隙、溶孔(洞)为突水途径,突水类型为直接式突水;后者以高压水头顶托渗透为突水力源,以各类原生、次生裂隙为突水途径,突水类型为间接式突水。并论证了矿床“二元”突水的治理对策与方法,提出未来矿床开采以平行疏排降水为主,并正确预留C2矿床底板天然隔水层防护。

In this paper the conceptual model of ＂duality＂ water irruption has been established in the Bauxite Aluminium ore in Jiagou, Henan, which indicates that the sources of the inrush water come from two different seepage fields ： the seepage field of Carboniferous （ C3 ） aquifers above the Aluminium ore and the seepage field of Ordovician （ O2 ） and Cambrian （ ∈2＋3 ） aquifers below the Aluminium ore. For the former, the force source of water irruption is the gravitational force of groundwater. The water irruption routes pass through cranny or karst caverns and the type of water inrush is the direct irruption. For the latter, the force source of water irruption is the upward pressure caused by high-pressure head under the Aluminium ore. The routes of water irruption pass through various primary and secondary crevices and the type of water inrush is the indirect irruption. The countermeasures against the ＂duality＂ water irruption were proven. ＂Parallel drainage＂ method as the major measure to exploitation of the ore in the future and reserving a natural aquifuge located under the C2 aquifer to prevent water inrush were put forward.