Analysis model to simulate the cracked pipe buried in soil
This paper describes the use of the finite element method to simulate crack propagation in a pipeline in the presence of soil backfill. Since typical values for soil modulus are known, a spring element can be used to simulate the effects of backfilled soil on crack propagation. This consists of the relationship between the soil property and the stiffness of the spring element, and the effect of backfill depth on the crack propagation in the pipes. By equating crack driving force,G, in the presence of soil, to the dynamic fracture toughness of the pipeline material, a theoretical predictive capability is obtained for the first time for the gas transmission and distribution pipelines. Numerical calculations have also been carried out for the cracked pipe with backfill and without backfill.
Key Wordsfracture mechanics finite element simulation pipeline soil
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- 1.Vanspeybroeck P. New test methods to evaluate the resistance to rapid crack propagation in pressurized polyethylene pipes. Proceedings of Plastics Pipes Eight, D1/6, Netherlands 1992Google Scholar
- 3.Kanninen MF, Sampath SG. Crack propagation in pressurised pipelines. Pressure Vessel Technology, Part II, ASME, New York, 1973, 971–980.Google Scholar
- 5.Zhuang Z. The Development of Finite Element Methods for the Investigation of Dynamic Crack Propagation in Gas Pipelines. Ph D Thesis. Ireland: University College Dublin, 1995Google Scholar
- 7.Parry RHG. Ed. Stress-strain behaviour of soils. Proceedings of the Roscoe Memorial Symposium. Cambridge University, March, 1971Google Scholar
- 8.Head KH. Manual of Soil Laboratory Testing Vol.2: Permeability, Shear Strength and Compressibility Tests. London: Pentech Press, 1982Google Scholar
- 9.Timoshenko SP, Goodier JN. Theory of Elasticity. 3rd Edition. New York: McGraw-Hill Book Company, 1970Google Scholar