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一、概况 南岭隧道位于湖南郴州南约30公里处,穿越长江与珠江两水系的分水岭——横亘东西的南岭剥蚀中低山。海拔320～500m,隧道长6.1km,一般埋深35～60m,按双线人字坡电化断面设计,采用双层模注复合式衬砌。 隧道穿过连溪复背斜(图1)和一系列NNE向的新华夏系褶皱断裂带,进出口为砂页岩,中部为石灰岩夹小段砂页岩。由于本区地处分水岭,且受NNE向构造制约,在复式背斜上,形成了NNE向垄脊与槽谷柑间并存的
I. Overview Nanling Tunnel is located about 30 kilometers south of Chenzhou in Hunan Province. It traverses the watershed between the two streams of the Yangtze River and the Pearl River, and runs through the middle and lower reaches of the Nanling Ridge. Elevation 320 ~ 500m, the tunnel 6.1km long, the general depth of 35 ~ 60m, according to double-line gable design of the electric cross-section, the use of double-layer injection composite lining. The tunnel passes through the Lianhe anticline (Fig. 1) and a series of NNE-trending Xinhuaxi fold fold zones with sand shale at the entrance and exit and limestone clip sand shale in the middle. Because this area is located in the watershed and is constrained by the NNE structure, a coexistence of NNE ridge ridge and trough grain is formed on the compound anticlines