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大瑶山隧道在京广铁路南段坪石至乐昌站间,横穿南岭山脉南端的瑶山山区,全长14.3公里,最大理深910米,是一座铁路双线隧道,也是我国最长的交通隧道。 隧道穿行武水峡谷西岸,洞身中部有两排大山沿NNE方向伸延,海拔1,000米以上,其间为一狭长谷地,宽1～2公里,海拔仅300～600米。溪流曲折,峰峦陡峭,地势十分险峻,为地质勘测带来不少困难。至1980年为止,已进行60多平方公里的区域地质勘探,7.5
Dayaoshan tunnel Jing-Guang Railroad in the southern section of the stone to Lechang station, crossing the southern tip of the Nanling mountainous area of Yao Mountain, a total length of 14.3 kilometers, the largest deep 910 meters, is a double-track railway tunnel is also the most Long traffic tunnel. The tunnel runs through the west bank of Wushui Canyon. There are two rows of mountains stretching along the NNE in the central part of the cave. The elevation ranges from 1,000 meters above sea level to a narrow valley with a width of 1 to 2 kilometers and an elevation of 300 to 600 meters. Stream twists and turns, steep peaks, the terrain is very steep, geological exploration has brought many difficulties. By 1980, more than 60 square kilometers of regional geological exploration had been conducted, 7.5