Analysis of Underground Pipelines Subjected to Frost Heaving Forces

Author:

Song Weon Keun1,Rhee Jong Woo

Affiliation:

1. Korea Infrastructure Safety and Technology Corporation

Abstract

This paper examined the fundamental problem of an interaction between a soil medium that experiences frost heave in a closed system and an underground pipeline. The coupled thermal transfer and structural analysis, considering the material nonlinearity of freezing soil, for an underground pipeline subjected to the low cyclic load was focused on the development of computational scheme by introducing the effective heat capacity concept and the effective thermal expansion coefficient into the study. The effective heat capacity model in the thermal transfer analysis took into consideration the phase-change effect in the frozen fringe of a soil medium. The comparative analyses between the theory and the actual performances were valuable in establishing a level of confidence in the application of introduced theory to the field. The numerical results in the paper illustrated the influence for the frost heave of a soil medium on the temperature-dependent development of stress fields on metallic underground pipe walls in South Korea.

Publisher

Trans Tech Publications, Ltd.

Subject

Mechanical Engineering,Mechanics of Materials,General Materials Science

Reference10 articles.

1. W.K. Song and M.K. Kim: An Assessment of Fatigue Life Cycle for Buried Pipelines in Consideration for Corrosion and Frost Heave of a Geotechnical Medium: Ⅰ, An Assessment of Physical Properties of a Frozen Soil Medium, Journal of the Korean Society of Civil Engeneers, 24 (2A) (2004).

2. R.D. Miller: Freezing and heaving of saturated and unsaturated soils, Highway Research Record, 393 (1972), pp.1-1/1 2/6 3/14 4/19 5/26 7/1 8/7 9/12 10/19 11/24 12/31 Date (m/d) σ max (Mpa) Incheon Taejon Pusan.

3. J.P.G. Loch and B.D. Kay: Water redistribution in partially frozen, saturated silt under several temperature gradients and overburden loads, Soil Science Society of American Journal, 42 (3) (1978), pp.400-406.

4. T. Zhang and T.E. Osterkamp: Considerations in determining thermal diffusivity from temperature time series using finite difference methods, Cold Regions Science and Technology, 23 (1995), pp.333-341.

5. F.E. Nelson, S.I. Outcalt, C.W. Goodwin and K.M. Hinkel: Diurnal thermal regime in a peat- covered palsa, Toolik Lake, Alaska, Arctic and Alpine Research, 38 (4) (1985), p.310−315.

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