Application	PLAXIS 2D PLAXIS 3D
Version	PLAXIS 2D 2024.2 PLAXIS 3D 2024.2
Date created	3 September 2024
Date modified	3 September 2024

 

With the release of PLAXIS 2D and PLAXIS 3D 2024.2, the Clay and Sand Model (CASM) has been released as a new User-Defined Soil Model, using a fully implicit stress integration scheme to ensure numerical accuracy, stability and robustness.

CASM, originally formulated by Yu (1995, 1998), is based on the Critical State Soil Mechanics framework (Schofield and Wroth, 1968) and represents a versatile constitutive model able to simulate the behaviour of both clays and sands.

CASM can simulate flow (or static) liquefaction of loose sands and silts, such as loose tailings, and has been successfully employed to analyse the Brumadinho (Arroyo and Gens, 2021), Merriespruit (Mánica et al., 2022) and Tar Island dam failures (Laera et al, 2024).

Compared to the original formulation, this version of CASM includes Lode's angle dependency, an alternative plastic potential equation (Arroyo and Gens, 2021) and a visco-plastic extension (Mánica et al., 2022). Two formulations are included within the same UDSM (casm64.dll): the rate-independent elastoplastic model, CASM, and the rate-dependent elasto-viscoplastic model, CASM-visco.

For more information, check the CASM manual below.

 

 

                                                         

 

Downloads

• PDF: PLAXIS - CASM manual [PLAXIS 2024.2]