The Research Of The Structure Mode And The Practical Technology For Water Preventing And Draining Of Highway Tunnel In Gansu Province

This paper states on the problems in water preventing and draining of highway tunnel of loess in Gansu Province and near area.Firstly,it discusses the method to analyze and calculate the affect of groundwater characteristic,estiniate of tunnel water quantity and the varying of water contained in loess to the stability of surrounding rock mass according to the principle of groundwater leaking, hydraulic penetrating principle, groundwater dynamic law, groundwater flowing modulus low and so on. Secondly, it brings forward that it is a practical technical and structure mode to use the multiple preventing layer as the water preventing and draining system in highway tunnel of loess.