红层环境下的碳酸盐岩岩溶隧道暗河水文地质调查研究

Hydrogeological Investigation of the Underground River of Karst Tunnel in Carbonate Rock of Red Bed

在云南滇中红层区域存在非可溶岩(砂泥岩等)和可溶岩(碳酸盐岩)接触带的异常地质结构,该地质结构存在有特殊的溶洞和暗河。文章以宜良至石林高速公路山冲箐隧道为例,通过暗河区域地质判译、暗河区地表出水口调查、瞬变电磁法视电阻率探测、洞内地质雷达扫描等方法,分析了典型穿插型接触带暗河的基本属性,认为该暗河属地表裂隙水补给,无区域联通,并预测了隧道涌水量,给出了基本的治理方法。研究成果对今后类似隧道工程的设计和施工具有一定的指导意义。

There are abnormal geological structures like karst caves and underground rivers in the contact area be⁃tween the insoluble rocks(such as sandstone and mudstone)and soluble rocks(such as carbonate rocks)in the red bed area of central Yunnan Province.Taking the Shanchongqing tunnel on Yiliang-Shilin expressway for example,the hydrogeological conditions of the underground river in the typical interspersed contact zone is analyzed by means of geological interpretation,investigation of water outlet at ground surface,apparent resistivity detection with transient electromagnetic method and geological radar scanning inside tunnel.It concludes that the water supply of the karst river is ground surface fissure water without regional connection,and tunnel water inflow is predicted as well as basic treatment methods are proposed.