STAND-UP TIME OF TUNNELS IN SQUEEZING GROUND - 1. A PHYSICAL MODEL STUDY - 2. GENERAL CONSTITUTIVE.

L. R. Myer, T. L. Brekke, G. E. Korbin, E. Kavazanjian, J. K. Mitchell

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

The effect of tunnel size, advance rate, and depth of cover on the stand-up time of tunnels in squeezing ground was investigated through a series of 12 physical model tests. The stand-up time, defined as the time elapsed before instability develops, was found to be characterized by increasing deformations and deformation rates rather than a catastrophic collapse of the tunnel. To establish a predictive capability, a constitutive theory describing the time dependent behavior of soft clays has been developed. By generalizing existing empirical rules developed for fixed boundary conditions and then unifying these empirical rules with a tensor framework, a multi-axial constitutive equation describing the stress-strain-time behavior of normally loaded soft clays was formulated.

Original languageEnglish (US)
Title of host publicationUS Dep Transp, (Rep) DOT/TST
Edition77-59
StatePublished - Jun 1977
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)

Fingerprint Dive into the research topics of 'STAND-UP TIME OF TUNNELS IN SQUEEZING GROUND - 1. A PHYSICAL MODEL STUDY - 2. GENERAL CONSTITUTIVE.'. Together they form a unique fingerprint.

  • Cite this

    Myer, L. R., Brekke, T. L., Korbin, G. E., Kavazanjian, E., & Mitchell, J. K. (1977). STAND-UP TIME OF TUNNELS IN SQUEEZING GROUND - 1. A PHYSICAL MODEL STUDY - 2. GENERAL CONSTITUTIVE. In US Dep Transp, (Rep) DOT/TST (77-59 ed.)