Title: Tunnel Instrumentation

Author(s): H.B. Voort

Publication: Symposium Paper

Volume: 54

Issue:

Appears on pages(s): 713-721

Keywords:

DOI: 10.14359/18054

Date: 1/1/1977

Abstract:
Tunnelling means creating a void in rock or soil. As a consquence of this disturbance of previously stable and balanced conditions, the rock around the void will move more of less towards the opening, until stress-redistribution which in most cases of conventional tunnelling is achieved by applying a lining to the tunnel leads to a new equilibrium. It is one of the characteristics of the NATM to allow considerable radial rock displacement under controlled conditions depending on the type of rock and on the thickness of overburden. This means that instrumented cross sections to moniter the behaviour of the tunnel are frequent.