Obtaining final pore pressure

[f.figueroa]

Hello everyone,
I am workin in Hydrus 2D and have a profile approximately 2 km long, as shown in the attached file. Based on the final result of this model, is it possible to obtain the final pore pressure somehow? And if so, what method does the software use to calculate it?
Thanks in advance!

[Jirka]

How do you define “pore pressure”? Isn’t the pressure head (h), the main variable calculated by HYDRUS, what you are asking for? The pressure head is in length units, e.g., in meters. If you want to convert it to pressure units (P in Pascals), you need to simply multiply it by the density of water (ro_w) (about 1000 kg/m3) and gravitational acceleration (g), i.e., P=ro_w*g*h.

J.

[f.figueroa]

Hi, thank you for the quick reply.
Indeed, I’m looking for a result in pressure units (Pa). I initially came to the same conclusion, but the question that arose is whether that result includes the component of pressure due to the confining stress of the material, or if the pressure head calculated by the software accounts for the weight of the material.
Thanks again for your help.

[Jirka]

The component of pressure due to the confining stress of the material: No, the Richards equation, which HYDRUS solves, does not consider that (and I do not think it should; nor does the Bousinesque equation that Modflow solves). J.

[f.figueroa]

Thanks a lot for your help, I really appreciate it!

[Jirka]

We have a module “Slope Cubee”, which calculates mechanical stresses and slope stability. However, I’m not very familiar with this package. J.

[f.figueroa]

Thank you for your help. The area I am working in is indeed Geotechnical Engineering and Slope Stability. Do you know what the difference is between the Slope Classic module and the Slope Cube module?

Also, who can I contact for more specific questions about these modules? Once again, thank you for your time.

[Jirka]

You can obviously get all this information at the HYDRUS website. You can download here the manuals for both modules, as well as contact information about the developers.
PC-PROGRESS - SLOPE Cube Module
PC-PROGRESS - SLOPE Classic Module
J.

[f.figueroa]

Thank you very much for the information and your time. I will review the pages you mentioned.