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Theory Manual Version 3.6
 Subsection 3.4.2: Linearization along Up Section 3.4: Weak Formulation for Multiphasic Materials Subsection 3.4.4: Linearization of External Virtual Work 

3.4.3 Linearization along

The linearization of the first term in along yields where represents the spatial tangent of the stress with respect to the effective concentration. The next term is where and are the spatial tangents of the effective hydraulic permeability and solute diffusivity with respect to the effective concentration.
The next term reduces to The following term is where The last term is where we similarly used a backward difference scheme to discretize the time derivative.
 Subsection 3.4.2: Linearization along Up Section 3.4: Weak Formulation for Multiphasic Materials Subsection 3.4.4: Linearization of External Virtual Work