Gotthard Base Tunnel Sedrun section mastering squeezing rock zones

摘要

Since more than three years the main tunnel of the Gotthard Base Tunnel is under construction. In the central section of Sedrun large zones with squeezing rock are predicted. The project takes the high forces and the necessary deformations into account. For the rock support steel ribs are the main elements. Special on site tests were carried out to check the effectiveness of the chosen rock support.