摘要
Abstract
The proposed China-Nepal Railway is unique for the distribution of extremely complicated geological characteristics, including complex terrain, varied lithology, regional deep fractures, active neotectonics, frequent earthquakes, multiphase magmatic activity. The geothermal activity zones of the YarlungZangbo River and Brahmaputra Valley, through which the proposed China-Nepal Railway will pass, are characterized with well-developed geothermal belt featured by high temperature and heat flow value. On the basis of collecting and investigating the characteristics of the high temperature distribution along the highlands, the influence of the high ground temperature on the project, classification criteria of the high temperature heat damage and corresponding control measures are studied, and the principle of line selection is defined from the geological point of view. The results show that the proposed railway is dominated by high temperature geothermal ultra high temperature zone. The line must avoid areas with extensive potential serious heat damage. When the line must pass through such an area, the edges of the area with simple structures and low geothermal intensity should be considered and bridge and subgrade engineering is employed. If a tunnel is constructed in such an area, the depth of the tunnel should be reduced.关键词
中尼铁路/地热活动带/高地温/地质选线Key words
China-Nepal Railway/Geothermal activity zone/High ground temperature/Geological line selection分类
交通工程
