Purdue University Graduate School
Browse

File(s) under embargo

1

month(s)

7

day(s)

until file(s) become available

CALIBRATION AND VALIDATION OF A HIGH FIDELITY DISCRETE ELEMENT METHOD (DEM) BASED SOIL MODEL USING PHYSICAL TERRAMECHANICAL EXPERIMENTS

thesis
posted on 2022-09-08, 13:52 authored by Omkar Ravindra GhikeOmkar Ravindra Ghike

A procedure for calibrating a discrete element (DE) computational soil model for various moisture contents using a conventional Asperity-Spring friction modeling technique is presented in this thesis. The procedure is based on the outcomes of two physical soil experiments:

(1) Compression and (2) unconfined shear strength at various levels of normal stress and normal pre-stress. The Compression test is used to calibrate the DE soil plastic strain and elastic strain as a function of Compressive stress. To calibrate the DE inter-particle friction coefficient and adhesion stress as a function of soil plastic strain, the unconfined shear test is used. This thesis describes the experimental test devices and test procedures used to perform the physical terramechanical experiments. The calibration procedure for the DE soil model is demonstrated in this thesis using two types of soil: sand-silt (2NS Sand) and silt-clay(Fine Grain Soil) over 5 different moisture contents: 0%, 4%, 8%, 12%, and 16%. The DE based models response are then validated by comparing them to experimental pressure-sinkage results for circular disks and cones for those two types of soil over 5 different moisture contents. The Mean Absolute  Percentage Error (MAPE) during the compression calibration was 26.9% whereas during the unconfined shear calibration, the MAPE was calculated to be 11.38%. Hence, the overall MAPE was calculated to be 19.34% for the entire calibration phase.

History

Degree Type

  • Master of Science in Mechanical Engineering

Department

  • Mechanical Engineering

Campus location

  • Indianapolis

Advisor/Supervisor/Committee Chair

Hazim El-Mounayri

Additional Committee Member 2

Jing Zhang

Additional Committee Member 3

Andres Tovar

Usage metrics

    Categories

    Licence

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC