渝怀铁路是国家西部大开发十大基础设施建设标志性工程之一 ,线路全长62 4.5 2 3km ,相继穿越重庆、贵州、湖南三省市。其间两跨长江、嘉陵江 ,三跨乌江 ,沿线峡谷纵横 ,山崖陡峭 ,道路崎岖 ,断层、溶洞、滑坡、软土、涌水、突泥、落石、塌陷、煤层、瓦斯以及泥石流、膨胀土比 Yu-Huai Railway is one of the top ten infrastructure projects in the western development of China. The route covers a total length of 62 4.52 3km and successively passes through Chongqing, Guizhou and Hunan provinces and cities. In the meantime, there are two bridges across the Yangtze River, the Jialing River and the Three Spans of Wujiang River. The canyons are steep, rugged, faulty, cave, landslide, soft soil, gushing water, mud, rockfall, collapse, coal seam, gas and debris flow, expansive soil ratio