Estimate Of Water Amount In The Tunnel Across Yellow River On East Route Of The South-North Water Transfer Project

In order to demonstrate the key geological problem of the rushing condition during the underwater tunnel excavation, this essay takes the east route of the South-North Water Transfer Project (SNWTP) as an example to give a minute description to the geological condition of this project, particularly its hydrological condition.Due to cutting through the rock under the bottom of the Yellow River, the key engineering geological problem is the meeting of the Yellow River water, phreatic water and Karst fissure water. To excavate the tunnel will result in the rushing of water.It's different to make further clear of the tunnel's geological condition by means of the following methods, such as drilling & geophysical exploration, etc. Therefore, excavating prospecting tunnel can not only finds out the tunnel's geological condition (the focal point is Karst & hydrological condition), but also explores the possibility of excavating the underwater tunnel by grouting beforehand in the Karst area in the process of the excavation and carries out all kinds of scientific experiments, which can prove necessary scientific basis for the further design and construction of the tunnel.Up to now, the successful excavation of prospecting tunnel has gone through for nearly twenty years. The practice shows that it is completely possible to excavate the underwater tunnel in the complicated Karst area as long as reasonable measures being used. All the above has established the important foundation of the construction.This essay collects, analyses and concludes the excavation information of different periods, predicts and demonstrates the rushing condition during the tunnel excavation, and also raises the special step of the treatment.