fix: correct the effective stress calculation for thermoporomechanics #3884
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This PR aims to correct the current GEOS effective stress calculation such that it is consistent with Terzaghi definition. Detailed explanations on the issue and this change can be seen in the file attached.
THMEffStress_GEOS.pdf
dTotalStress_dTemperatureinPorousSolidfor the thermal caseplasticStrainfield to constitutive model