Tunnelling-Induced and Time-Dependent Ground Behavior of Phase VI Evanston Tunnel

TitleTunnelling-Induced and Time-Dependent Ground Behavior of Phase VI Evanston Tunnel
Publication TypeConference Proceedings
Year of Conference2006
AuthorsSrisirirojanakorn, T
Conference NameInternational Symposium on Underground Excavation and Tunnelling
Abstract

In Phase VI Relief Sewer Project in Evanston, Illinois, U.S.A., four test sections were installed in the path of a tunnel in a deep deposit of Chicago clay ranging in consistency from medium to hard. Ground movements and pore pressures were measured ahead of the shield, during tunnel advance, and long after shield passage at the test sections, using a series of geotechnical instruments installed at various distances from the sewer tunnel. The project provided the opportunity to revisit tunnel ground behavior of the Chicago clay. The tunnel was constructed in 2000 at an average springline depth of 21.3 m below ground surface. This paper describes short- and long-term performances of the tunnel using field monitoring results.