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一、概况南岭隧道位于京广复线郴州至坪石区间,全长6058m,双线隧道,洞内为3‰人字坡。该隧道穿越南岭褶皱带,地处骑田岭与五盖山之甬道间,属南岭剥蚀中低山区,且为长江与珠江水系之分水岭,海拔标高为320～500m。山区内植被稀少,灰岩裸露,岩溶漏斗、落水洞、岩溶泉、溶蚀洼地发育,多呈串珠状分布。较大的溶蚀洼地有横下垄、茅山里、岭白塘、生潮垄和下涟溪五处,尤以茅山里、岭白塘、生潮垄溶蚀最为强烈。下涟溪地面最低标高为319m,呈岩溶峰丛洼
I. Overview Nanling Tunnel is located in Beijing-Guangzhou double-track line from Chenzhou to Pingshi, a total length of 6058m, two-lane tunnel, the cave is 3 ‰ Prodigal slope. The tunnel passes through the Nanling fold belt and lies between the corridors of Qitianling and Wengaishan. It belongs to the middle and low mountain areas of the Nanling Ridge and is a watershed between the Yangtze River and the Pearl River. The elevation is 320 ~ 500m above sea level. Mountain vegetation scarce, exposed limestone, karst funnel, sinkhole, karst springs, dissolution depression development, mostly beaded distribution. Larger erosion depressions have horizontal ridge, Maoshan, Lingtangtang, tidal ridge and the next Lianli five, especially in Maoshan, Lingtangtang, damp ridge erosion is the most intense. Lower Lianxi ground minimum elevation of 319m, was karst peaks cluster depression