Stress rotation is also incorporated so that the cyclic mobility can be The recent developed feature of principle The model isįrequently applied to tailings dam analysis.įLAC3D's implementation also considers the effect of Lode’sĪngle so that the shear strengths with different second principal Slope-steepened, or sudden rising of pore-pressure. (i.e., flow liquefaction) of a soil structure being over-surcharged, It is suitable for simulating the typical brittle collapse Static liquefaction of very loose soils through to dilation of veryĭense soils.
NorSand explicitly captures the full range of soil behavior, from Laboratory or in-situ tests (e.g., CPT data). Properties which are familiar and can be estimated from routine So that it captures the behavior of granular soils over a wide range ofĬonfining stresses and densities. Slips rather than bonds, intrinsically incorporating the state parameter Particle-to-particle interactions are controlled by contact forces and
Is a critical state model applicable to soils in which NorSand ( Jefferies 1993, Jefferies and Been 2015) Zhao Cheng’s GEESD V conference presentation:Ī Practical 3D Bounding Surface Plastic Sand Model for Geotechnical Earthquake Engineering Application (PDF, 4 MB) NorSand (Static/Dynamic/Liquefaction) Learn more about this powerful and easy-to-use solution by downloading Itasca engineer Dr. preserves the feature that one set of model constants is used to simulate different responses with different initial relative densities and initial stress states.requires only the initial soil relative density (Dr) and initial stresses to match the semi-empirical relation of CRR versus some in situ parameters, such as (N1)60 or qc1N, when using the default parameters, and.switches all void-ratio related formula, including the elastic modulus, plastic hardening modulus, and critical state, to be relative-density related,.retains the general 3D formulation, considering Lode angle effect, and thus can be used for general 3D boundary value problems,.In addition, the new liquefaction model provides an easier, more practical calibration procedure in terms of in situ data (instead of experimental data), greatly reducing the labor of calibration. By revising some formulas without destroying the conciseness of the original DM04 (Sanisand) model, the improved comparative results between model simulations and lab/field observations are obtained under various initial conditions and loading conditions. Itasca is pleased to introduce the P2P-Sand (Practical Two-Surface Plasticity model for Sands) model, a new practice-friendly 3D liquefaction constitutive model for FLAC3D that is based on the DM04 (Sanisand) model (Dafalias & Manzari, 2004).