Abstract:Research purposes: One newly - built railway passes through the Hengduan Mountain area in southwest of China,with complicated geological conditions. The railway tunnel construction was seriously affected by the geothermal water. This paper summarizes the distribution of geothermal water and the geological and topographic characteristics of the areas where the railway passed through,analyzes the influence factors of supply sources of geothermal spring at eleven areas on the railway track and discusses the railway alignment for providing the reference to the engineering survey under similar geological conditions.
Research conclusions: These geothermal water areas belong to the geothermal zone within the Eurasian plate,mainly comprising of fracture - type geothermal zone. The geothermal water easily exposes in the fault zone,the area with complicated structure,the dike intrusion zone and the wall rock alteration zone,and it is closely related to the new tectonic movement. The temperatures of the geothermal water exposed in magmatic rocks and metamorphic rocks are high and the temperatures of the geothermal water exposed in the sedimentary rocks and Quaternary loose sediments layer are low. The main geothermal storage layers are of the soluble karst rock of the presinian,sinian and Triassic and of the granites of the Variscan and Indosinian. The insulation layers are of the metamorphic rocks,clastic rocks and loose sediments with poor water conductivity and thermal conductivity. The geothermal waters in eleven areas that influence the the railway are originated from the precipitate water and drained into river valleys or ravines after circulating and heating in the fault zones. With the CIVK program currently recommended,the geothermal water produces a little influence on the railway track,but the program needs to be improved further.
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