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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 42
ADVANCES IN COMPUTATIONAL METHODS FOR SIMULATION
Edited by: B.H.V. Topping
Paper V.5

Quantification of Backfill Effects on Crack Propagation Pipeline

Z. Zhuang# and P.E. O'Donoghue*

#Department of Engineering Mechanics, Tsinghua University, China
*Department of Civil Engineering, University College of Dublin, Dublin, Ireland

Full Bibliographic Reference for this paper
Z. Zhuang, P.E. O'Donoghue, "Quantification of Backfill Effects on Crack Propagation Pipeline", in B.H.V. Topping, (Editor), "Advances in Computational Methods for Simulation", Civil-Comp Press, Edinburgh, UK, pp 189-193, 1996. doi:10.4203/ccp.42.5.5
Abstract
This paper describes the use of a finite element package to simulate dynamic axial crack propagation in a gas pipeline in the presence of soil backfill. A unique fluid/structure/ fracture interaction analysis package, PFRAC. has been modified to take account of the soil overburden pressure. In the developments described here. the soil is modelled using a special non-linear spring clement. The stiffness of the springs is then related to the modulus for the soil. In this way. different soil types and pipes that are buried at different depths can be considered. In each instance. it is possible to calculate the resulting crack driving force. G. including the overburden. Numerical examples are presented for t he cracked pipe with backfill and without backfill. Thus it is possible to see the beneficial effects of the soil as the crack driving force is reduced.

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