姑山疏干平巷位于姑山矿床底部,水平标高-72m。巷道断面净宽2.1m,墙高2.3m,顶部采用三心拱,拱高0.7m。环形疏干平巷总长达3000m,整个工程分为二期完成。一期工程包括一条竖井,一条斜井。竖井井筒直径φ4.5m;斜井长度146m,坡度25°。疏干平巷从两井分头掘进,设计平巷绝大部分位于辉长闪长岩岩层中,且部分辉长闪长岩泥化、破碎,夹杂着淋水和部分涌水,给施工带来难度。特别是闪长岩遇水软化、膨胀,给支护造成极大困 Gushan dry Lane at the bottom of the Gushan deposit, the level of -72m. Lane section net width 2.1m, 2.3m high wall, the top of the three heart arch, arch height 0.7m. Drilling lanes total length of 3000m, the entire project is divided into two completed. The first phase includes a shaft and an inclined shaft. Vertical shaft diameter φ4.5m; inclined shaft length 146m, slope 25 °. Dredging drift from the two wells separately headway, most of the design Lane is located in the gabbro diorite, and some galenic diorite mud, broken, mixed with water and part of the gushing water, to the construction of the degree of difficulty . In particular, diorite softens and expands with water, causing great difficulties to the support