Dear OGS developers,
I would like to merge our implementation into the trunk.
The major changes:

Coupled THM time controlled excavation.

Neglect H initial effect
According to the effective stress concept the balance equation for DEFORMATION process is written as:
(1)
In current OGS it is implemented as the increment from the initial stress state, and has the form:
(2)
where,
is the initial stress tensor,
and is the current stress tensor and pore pressure. Apparently the initial state of pore water pressure is not considered. But, sometimes it is necessary, e.g. for coupled HM modelling of excavation process. Thus, we modify the equation to the following form:
(3)
A new subkeyword is introduced, and users can flexibly choose between Eq.2 and Eq.3.

Anisotropic plasticity with MohrCoulomb criterion
A benchmark with description in details will be uploaded later.

Dependence between storage coefficient and the minimum principal stress

Automatically calculate storage coefficient from the stiffness parameters (Young’s modulus, Poisson ratio) of anisotropic material by the coupled LIQUID_FLOW and DEFORMATION modelling.
If there is no objection, I will update the trunk next week. Some benchmarks will be uploaded when the version release is done.
With best regards,
Wenjie
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