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| The Hydrogeology Survey and Line Selection for the Guanyinshan Tunnel of Chengdu - Guiyang Railway |
| GUI Jin - xiang，YUE Zhi - qin |
| (China Railway Eryuan Engineering Group Co. Ltd，Chengdu, Sichuan 610031, China) |
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Abstract Abstract：Research purposes： The Guanyinshan tunnel of new Chengdu - Guiyang railway is located in Dafang county， Bijie city of Guizhou province. On the account of the fast uplift of Yunnan - Guizhou plateau, the deep river cutting over 600 m and the development of geological structure and heavy rainfall，the karsts in the limestone area of Permian and Triassic were extremely developed and the corrosion datum became very low. As a result，the surface water system was not developed and the surface water environment became extremely harsh and sensitive. What s more，the karst rocky desertification was quite serious. Therefore，we need to identify the geological factors which can affect the route plans and study their hazards，to predict the adverse effects on the engineering and provide the basis for the railway location and project settings.
Research conclusions:( 1 ) This tunnel was located in the south - north tectonic belts of sandblasting well， which combined the backbone of epsilon - type structures with the east - west tectonic belts of road slope in western Guizhou. The faults, folds and transverse tension joints which were perpendicular to their axis were developed. (2) The Qihua - tianba anticline was capsized anticlines and the ring closure shaped mud shale in two wings and capsized sides cut off the channel of the karstic water. Thus，the local small watershed perpendicular to the anticline axis not only greatly weakened the karst development level in the south of Guanyinshan watershed，but also created the conditions for the formation of Lutang reservoir with the plateau - mountain pool type. (3) The line was chosen in the un - development karst area far away from the Lutang reservoir. Based on these conditions, it can not only avoid the risk of karst and reservoir water, but also shorten the railway length and save the engineering investment. (4) The research results may provide guidance for geology route selection of railway and highway in complicated karst mountainous area.
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Received: 05 May 2016
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2016, Vol. 33 
