Geotechnical and monitoring challenges during excavation of a large urban tunnel in soft ground and low overburden

摘要

For infrastructure projects with shallow overburden a comprehensive geotechnical monitoring program and its implementation in the daily operation is essential for a successful and safe completion of the works. A continuous control of both the tunnel and the surface according to the observational method within a strict geotechnical safety management is one of the most challenging tasks for such projects. The paper describes - from the point of view of the project's geotechnical on-site engineer and the designer - with two case histories the geotechnical and monitoring challenges at the OeBB Lainzer Tunnel lot LT 31.