昆阳磷矿二矿水文地质特征及斜井工程防治水探讨

Discussion on Hydrogeological Characteristics of Kunyang Phosphate’s No.2 Mine and Water Control in Inclined Shaft Engineering

昆阳磷矿二矿矿床成矿地质背景复杂,震旦系晚期至寒武系海洋地质环境为地区磷的富集沉积创造了良好条件;但同时多回旋的大规模白云岩随着成矿作用成为上下盘直接围岩或间接含水层,而后随着地壳运动的挤压变形形成昆明前缘凹陷地西南部分香条冲背斜构造等地质行迹,矿区地层和工业矿体基本为SE倾斜的单斜构造。通过分析和实践,斜井施工防治水宜疏不宜堵,采用探地雷达超前探水(溶洞)地质钻探验证相结合及地质钻探手段探水、放水降压,保障了工程安全施工。

The mineralization geological setting of the Kunyang Phosphate’s No.2 deposit is complex, and the marine geological environment from the late Sinian to the Cambrian has created favorable conditions for the enrichment and deposition of phosphorus in the region;However, at the same time, the large-scale dolomite with multiple cycles became the direct surrounding rock or indirect aquifer of the upper and lower walls along with mineralization, and then with the compression and deformation from the crustal movement, the Xiangtiaochong anticline structure and other geological traces in the southwest part of the Kunming Front Sag, and the strata and industrial orebodies in the mine area are basically SE-dipping monoclinic structures. Analysis and practice shows that the water should be preferably drained instead of blocked when it comes to water control during the construction of inclined shafts and the use of ground penetrating radar for water detection(karst cave) along with geological drilling verification, as well as the use of geological drilling methods for water detection, water draining for pressure relief have helped ensure the safe construction of the project.