圆梁山隧道毛坝向斜段深部承压岩溶水系统浅析

ANALYSIS OF THE SYSTEM OF DEEP CONFINED KARST WATER OF YUANLIANGSHAN TUNNEL IN THE MAOBA SYNCLINE

通过地表调研、深孔勘探与抽水试验以及氢氧同位素测试 ,揭示向斜核部存在深部岩溶承压水系统 ,局部地带以绕轴与断层带局部承压径流的形式沟通向斜东西翼的水力联系 ,深部承压岩溶水系统在整个向斜水循环中所起的作用是很有限的。隧道施工时 ,应做好防水措施。

The Maoba syncline takes on trough physiognomy. It consists of two protruding legs and a concave core and is encircled by gigantic thick sandrock, shale and argillite of Silurian. Its core is composed of limestone with thin shale and argillite interlayer of Permian and Lower Trias layers. According to the surface survey, deep drill prospecting, pumping test and H O isotope measuring, the paper concludes that the karst water layerly develops in the Maoba syncline that tunnel goes through. There are three layers of water: water in T 1 d layer, water in P 2 w+c layer and water in P 1 q+m layer, and they are independent each other. The above shows that a system of deep confined karst water lies in the core of the syncline. It has hydraulic contact with the east and west legs by way of circling the axes and confined flux along fault belts in some part of the Maoba syncline. The amount of the deep water system is limited in the whole water cycle of the syncline. Waterproof steps should be taken during the construction of the tunnel.