Constitutive models for soil materials.

Classes
class	XC::MultiaxialCyclicPlasticity
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class	XC::MultiaxialCyclicPlasticity3D
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class	XC::MultiaxialCyclicPlasticityAxiSymm
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class	XC::MultiaxialCyclicPlasticityPlaneStrain
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class	XC::FluidSolidPorousMaterial
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class	XC::MultiYieldSurface
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Detailed Description