Research Output

Phase relations for decomposable soils.

  Expressions describing the phase composition and interphase relations for a decomposable soil are derived by distinguishing between inert and decomposable fractions. A relationship between void volume changes and decomposition of the solid fraction, effectively a constitutive relationship, is derived and described by a single parameter. Key patterns of volumetric response to decomposition are highlighted. The decomposition-induced void change parameter is shown to be capable of interpreting the sometimes episodic process of volumetric strain in a decomposable soil-like material.

  • Type:


  • Date:

    01 September 2004

  • Publication Status:


  • Publisher

    Thomas Telford for ICE

  • DOI:


  • ISSN:


  • Dewey Decimal Classification:

    624 Civil engineering


McDougall, J. & Pyrah, I. (2004). Phase relations for decomposable soils. Géotechnique. 54, 487-494. doi:10.1680/geot.54.7.487.46750. ISSN 0016-8505



Inert fraction; Decomposable fraction; Decomposition; Void volume change; Volumetric strain; Episodic change;

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