Analytical model for prediction of creep displacment of rocks around of circular tunnels

Document Type : Original Article

Authors

1 Prof., Amirkabir Univ. Tehran, Iran

2 [2] - Amirkabir Univ. Department of civil engineering

Abstract

In this paper the effect of creep is discussed. The burger body which is able to model the primary and secondary creep regions of rocks is applied. In order to analyze the behavior of circular tunnels in visco-elastic media and hydrostatical state of stresses, new relations are derived. The new proposed equations are able to predict the variations of the stresses and displacements during the time. In order to verify the analytical solution, a tunnel is analyzed numerically by using FLAC code. The results of these two analyses showed a proper agreement with the numerical analysis and an instrumented tunnel.

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References

 
Ladanyi B. (1993) “Time dependent response of rock around tunnel”,Rock  Comprehensive Engineering, Vol 2.pp. 77-112.
Cristescu N. D. (1989) “Rock rheology” ,1st Edn. , Kluwer Academic Publishers.
Cristescu N. D. , HunscheU. (1998) “Time effect in rock mechanics”, 1st  Edn. , Wiley, New York.
Panet M. (1993) “Understanding deformations in tunnels” , Rock Comprehensive Engineering, Vol 2,. pp. 663-690.
Sulem J., Panet M., Guenot A. (1987) “An analytical solution for time-dependent displacements in circular tunnel” , Int. J. Rock Mech. Min. Sci. & Geomech. Abstr.Vol 24, No. 3, pp. 155-164.
Panet M., Guenot A.(1982) “Analysis of convergence behind the face of a tunnel, proceedings of the 3rd international symposium, Brighton, 7–11 June”, pp.197–204.
Goodman R. E. (1989) “Introduction to rock mechanics”, 2nd Edn. , Wiley ,New York.
Scientific Quarterly Journal of Iranian Association of Engineering Geology
Volume 1, Number 3 & 4
March 2008
Pages 35-44

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History

  • Receive Date: 23 April 2008
  • Revise Date: 19 March 2009
  • Accept Date: 27 May 2009

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