GROUND TREATMENT FOR TUNNEL CONSTRUCTION OF LINE 10 EXTENSION TO THE MADRID METRO UNDER DIFFICULT GROUND WATER CONDITIONS

摘要

The aim of this paper is to describe and analyze the ground treatment performed between January and May 2002 in order to increase safety during excavation and reduce instability problems along 180 m of tunnel, during the construction works associated with line 10 extension to the Madrid Metro. The tunnel was excavated using the traditional Madrid Method and in the section considered in this paper layers of sand were detected around the tunnel crown area with a significant presence of water, the inflow of which needed to be controlled with a minimum impact on the surrounding environment.