'The following material properties are declared on block 1 by multiple materials' while simulating excavation

[vabufano]

Hi all,
I'm trying to model a very simple excavation case, referencing the example indicated at coal_mining and the suggestion from the discussion #26941 although that discussion then explores another method for simulating excavation.

I have a mesh divided into two blocks (a lower one called block1 in the input and an upper one called block2 in the input) and I would like to simulate the excavation of the upper block by reducing its density and stiffness over time. To keep the condition simple, I would like to perform the analysis under elastic conditions.

To achieve the time-dependent reduction of the aforementioned properties, I have defined two functions that depend on time.

When I try to run the input file, I receive this error message:

The following material properties are declared on block 1 by multiple materials:
Material Property Material Objects
mechanical_strain all_strain strain_block1
total_strain all_strain strain_block1.

Does anyone have any ideas or suggestions to solve this problem? I'm attaching the code I'm using (in the zip file also the mesh). Thank you!
column_excav_test.zip
column_excav_by_decreasing_dens_stiff.txt

[GiudGiud]

Hello

The tensor mechanics action (now called quasi static solid mechanics physics) is creating the strain material

but you are also creating it manually here

  [./strain]
    type = ComputeSmallStrain
    eigenstrain_names = ini_stress
  [../]

it's one or the other, and I recommend using the action / physics

Best,
Guillaume