Your single point of reference for all your Geotechnical Inquiries
TUNNEL FACE STABILITY AND SETTLEMENT CONTROL USING EARTH PRESSURE BALANCE SHIELD IN COHESIONLESS SOIL (2009)
Soft ground tunneling, in urban areas are generally bored using pressurized TBM. Tunnel design involves the need to revalue the classical concepts of deformation response to the excavation and the control priorities, focalized on face and cavity, loose their importance; the evaluation of the settlements becomes the main aspects to consider. The definition and the control of the face pressure are fundamental design steps. It is important to give a proper importance to the face pressure relating to settlements control. The pressure increase leads to higher safety factors of the face stability but it is not able to guarantee comparable settlements decrease.We examines the essential parameters in relation to the use of the EPBS in two case histories in Milan: line 1 extension to the new Fair and Passante rail infrastructure. The reference values of the cited parameters are identified for cohesionless soil i.e. fluvio-glacial sand deposit and gravel.
Geotechnical Aspects of Underground Construction in Soft Ground – Ng, Huang & Liu (eds), © 2009 Taylor & Francis Group, London
Soil S.r.l., Milano, Italy