福建省某铁矿岩溶水疏干试验方案优化设计

Optimized Design for Karst Water Drainage Test of An Iron Mine in Fujian

福建省某铁矿属于水文地质条件复杂的岩溶充水矿床,转入深部开采不仅面临水压高、涌水量大等问题,且深部水文地质条件局部不明,大型疏干试验势在必行。介绍了如何根据矿区水文地质条件和生产需求来设计疏干试验,包括选择疏干试验方式和布置疏干试验工程,合理设计疏干试验顺序、估算疏干流量与降深等多个部分,可满足降低矿区岩溶水位和查清水文地质条件的要求。其中在地下巷道放水孔的设计中利用本水平(中段)疏干和超前水平(中段)联合疏干,放水孔非均匀布置等,可为今后其他矿山深部开采疏干试验提供借鉴。

An iron mine in Fujian that is mining a hydrologically complicated deposit with karst water, faces the problems of not only high water pressure and high water inflow but also unclear local depth hydrological conditions when transiting to depth mining. Therefore, it is imperative for it to carry out large scale drainage test. The paper describes how to design the drainage test in accordance with the hydrological conditions and production demand, including the selection of the drainage test mode and test engineering layout, rational design of the test sequence, and estimation of drainage flowrate and drawdown to satisfy the requirements of reducing the karst water level and verifying the hydrological conditions. There are some innovative techniques that are adopted in the design of underground drainage test such as the combined drainage of both the sublevel and its advanced sublevel, and non - uniform layout of drain holes, which can be references for the drainage tests for depth mining of other mines.