Volume 2, Number 3 (September 2004)                   IJCE 2004, 2(3): 173-181 | Back to browse issues page


XML Print


Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

EFTEKHARZADEH F. AN EXAMINATION OF ROOF DEFORMATIONS OF TUNNELS DUE TO WEAKNESS ZONES IN ROCK. IJCE. 2004; 2 (3) :173-181
URL: http://ijce.iust.ac.ir/article-1-1067-en.html

Abstract:   (1696 Views)
According to experiences, zones of weaknesses, joint systems and sliding surfaces in rock masses, have a great effect on the deformation behavior of tunnel cross section and the stress development in the shotcrete cover. The loosening and detaching of rock due to roof deformations in turn can take progressive dimensions and lead to roof fall and in extreme case cave to the surface. In this study, the effect of weakness zones on increasing roof deformations is demonstrated and the radius of influence of such weaknesses is determined using a FE- program for 3- dimensional continuum. Furthermore it is shown that the thickness of such disturbances does not significantly affect the development of deformations i.e. if the stiffness conditions remain constant. Also the viscous material causes greater deformations than the elastic one. Finally the study indicates that tangential stresses in the lining are also increased by weakness zones.
     
Type of Study: Research Paper |

Add your comments about this article : Your username or email:
Write the security code in the box

© 2015 All Rights Reserved | International Journal of Civil Engineering

Designed & Developed by : Yektaweb