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Showing papers by "Subhendu K. Datta published in 1985"


Journal ArticleDOI
TL;DR: In this paper, the dynamic response of a cylindrical tunnel embedded in a semi-infinite elastic medium is analyzed, where the tunnel is assumed to be infinitely long, noncircular in cross section, and lying parallel to the plane-free surface of the medium.
Abstract: The dynamic response of a cylindrical tunnel embedded in a semiinfinite elastic medium is analyzed. The tunnel is assumed to be infinitely long, noncircular in cross section, and lying parallel to the plane‐free surface of the medium. The problem considered is one of plane strain, in which it is assumed that the waves are propagating perpendicular to the axis of the tunnel. Since this problem cannot be solved exactly except when the tunnel is circular, a numerical technique that combines the finite element method with the eigenfunction expansions is used. Numerical results are presented for the cases in which the tunnel is disturbed by plane longitudinal (P), vertically polarized shear (SV) and Rayleigh (R) waves. It is shown that the dynamic amplifications of the displacements and stresses induced in the tunnel depend crucially on the properties of the surrounding soil, the depth of embedment and the frequency of the incident simple harmonic disturbance.

27 citations



Journal ArticleDOI
TL;DR: In this article, a long wavelength and low-frequency analysis is presented for the dynamic behavior of a long continuous pipeline embedded in an elastic medium using a shell model for the pipe, it is shown that the dynamic amplification of axial and hoop stresses induced in the pipe due to traveling plane waves (longitudinal and shear) depends crucially on the ratio of the rigidities of the surrounding soil and the pipe.
Abstract: A long wavelength and low-frequency analysis is presented here for the dynamic behavior of a long continuous pipeline embedded in an elastic medium Using a shell model for the pipe, it is shown that the dynamic amplification of axial and hoop stresses induced in the pipe due to traveling plane waves (longitudinal and shear) depends crucially on the ratio of the rigidities of the surrounding soil and the pipe Results are presented showing the dependence of the induced stresses on the direction of propagation of the incident waves, the Poisson's ratios and rigidities of the ground and pipe materials

6 citations