新建渝黔铁路关键工程地质问题及地质选线研究

Studies on Key Engineering Geology Issues and Geological Alignment of Newly-built Chongqing-Guiyang Railway

研究目的:新建渝黔铁路位于重庆市西南部和贵州省北部地区,为一条连接西北、川渝和泛珠三角的干线铁路。渝黔铁路从地势相对较低的四川盆地延伸上云贵高原,穿越川滇褶皱区,地形起伏大,地质构造复杂,遍布各种不良地质及特殊岩土。有必要查清控制渝黔铁路的关键工程地质问题,进行工程地质选线。研究结论:(1)岩溶是本线最大的不良地质体,对工程的危害和影响是巨大的;(2)矿床及采空区是控制渝黔铁路改扩建工程的关键、重大不良地质问题,原则上应尽量绕避这些不易查清的小矿区;(3)区内大的地质构造主要走向为南北向、北东向构造及北北东向,应避免线路走行在顺层延伸的断裂带内,同时应严格控制挖方边坡高度、增加路堑边坡加固、隧道顺层滑动、顺层偏压的工程治理措施;(4)改扩建线路方案应尽可能避免改拆整治病害的建筑物,以免引起地质病害的复活。

Research purposes： The newly -built Chongqing- Guiyang Railway, located in the southwestern Chongqing Municipality and northen Guizhou Province, longitudinally passes through the municipality and province and it is the main railway to connect the northwest China with Sichuan, Chongqing and the Pan - pearl River Delta Zone. As this railway starts from the relatively lower terrain of the Sichuan Basin, stretches to the Yunnan - Guizhou Plateau and crosses the Sichuan- Yunnan folded region, the landforms fluctuate largely, the geologic structure is complicated and the unfavorable geological condition and special rock and soil are found everywhere. So it is necessary to well know the key engineering geology issues for the railway alignment.Research conclusions：（ 1 ）The karst is the most unfavorable geological object and has huge harm and impact on the railway construction. （2） The major unfavorable geological problems of the mineral deposit and the mined - out area are crucial to the railway construction. The railway should keep away from the small mining areas as much as possible. （3） The major geologic structures of the mining area are the north - south, east - north and north - north structures. The railway also should keep away from the fault zone that stretches along the layer In the meantime, the height of the side slope should be strictly controlled, and the measures of reinforcing the side slope and cutting and preventions of the tunnelg bedding sliding and bias pressure should be taken. （4）The railway lineg expansion program should as much as possible avoid changing or demolishing the building which would cause resurrection of geological disease.