Computational Geomechanics. Manuel Pastor

Computational Geomechanics - Manuel Pastor


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alt="v Subscript i Baseline equals k Subscript italic a i j Baseline left-parenthesis minus p Subscript a Sub Subscript comma j Subscript Baseline plus rho Superscript a Baseline b Subscript j Baseline right-parenthesis"/>

      where

eta Superscript a Baseline v Subscript i Superscript italic a s Baseline equals v Subscript i

      and

      The phase densities appearing in Sections 2.22.4 are intrinsic phase averaged densities as indicated above.

      (2.87)n ModifyingAbove upper S With ampersand c period dotab semicolon Subscript w Baseline plus upper S Subscript w Baseline ModifyingAbove u With ampersand c period dotab semicolon Subscript i comma i Baseline plus upper S Subscript w Baseline StartFraction n Over upper K Superscript w Baseline EndFraction ModifyingAbove p With ampersand c period dotab semicolon Subscript w Baseline plus w Subscript i comma i Baseline equals 0

      Similarly, the mass balance equation for air becomes

      (2.88)n ModifyingAbove upper S With ampersand c period dotab semicolon Subscript a Baseline plus upper S Subscript a Baseline ModifyingAbove u With ampersand c period dotab semicolon Subscript i comma i Baseline plus StartFraction upper S Subscript a Baseline n Over rho Superscript a Baseline EndFraction StartFraction partial-differential Over partial-differential t EndFraction left-parenthesis StartFraction upper M Subscript g Baseline Over italic theta upper R EndFraction p Subscript a Baseline right-parenthesis plus v Subscript i comma i Baseline equals 0

      Finally, if, for the solid phase, the following constitutive relationship is used (viz. Lewis and Schrefler 1998)

      where Ks is the bulk modulus of the grain material, then the mass balance equations are obtained in the same form as in Section 2.4 (with χw = Sw), though this is not in agreement with what was assumed here for the effective stress.

      2.5.6 Nomenclature for Section 2.5

      As this section does not follow the notations use of the book, we summarize below for purposes of nomenclature:

      ga =dry airgw =vapora =airw =waters =solid


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