How to use python to change the existing soil materials and assgin them to the specific soil layer?

Question

Hi, I am trying to calculate the safety factors of many models by inputting different soil parameters to analyze the distribution of safety factors. I want to change the soil parameters for each model. I checked the example in manual. Using this manual, I can set up new soil materials and assign them to the specific soil layer. In order to improve the calculation efficiency, I want to change the existing soil materials. I succeeded in doing this. But when I want to provide soil layers for new soil materials, it says, "Invalid parameters. Make sure that the specified parameters match the ones that are expected." 
 This is my python script: 
 SAND_PARAMETERS = [('Identification', 'Sand'), ('SoilModel', 2),('DrainageType', 'Drained'), ('gammaUnsat', 18),('gammaSat', 18),('Gref', 33460), ('nu', 0.27),('phi', 40)] sand = g_i.Sand.setproperties(*SAND_PARAMETERS) 
 LOWER_SAND_PARAMETERS = [('Identification', 'lowerSand'), ('SoilModel', 2),('DrainageType', 'Drained'), ('gammaUnsat', 18),('gammaSat', 18),('Gref', 33460), ('nu', 0.27),('phi', 35)] g_i.lowerSand.setproperties(*LOWER_SAND_PARAMETERS) g_i.Soil_1.Material=sand g_i.Soil_2.Material=lowersand

Micha van der Sloot · Answer

Hi 
 Please have a look at what is shown in the PLAXIS Input program to understand what is happening:

As you can see, the program is given the instruction to set the Material assignment for Soillayer 1 to "OK". This is because in your script you set the parameter sand to the result of the g_i.Sand.setproperties(...) instruction, which is the string "OK" in this line: 
 Na Hao said: sand = g_i.Sand.setproperties(*SAND_PARAMETERS) 
 To set the material assignment, you should either refer to g_i.Sand or if sand has been set earlier, do not set it again using the setproperties method, 
 I do not know the rest of your script, but make sure that the other material assignment works correctly as well. Easiest would be to use the material object references: 
 # assign materials:
g_i.Soil_1.Material = g_i.Sand
g_i.Soil_2.Material = g_i.lowerSand