Strength and Stiff ness Parameters for Tunnels in Weak Sedimentary Rocks – A Case Study of the East Coast Bays Formation in Auckland, New Zealand

摘要

This paper describes laboratory and in situ tests and determines a set of parameters for stiffness andrnstrength properties for a weak sedimentary rock mass, the East Coast Bays Formation of Auckland.rnThe parameters derived are discussed in relation to peak strength and in respect of deformationrnlimits associated with sequential excavate and support (SEM) or conventional tunnelling.