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Publication Number: FHWA-HRT-04-094
Date: November 2004

Evaluation of LS-DYNA Soil Material Model 147

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CHAPTER 1. INTRODUCTION

The calculations and conclusions of chapters 2 through 8 of this report were written by a potential end user of the soil material model (herein referred to as the user). The commentary of chapter 9 was written by the developer of the soil material model (herein referred to as the developer). Chapter 9 reviews the soil model evaluation conducted by the user in chapters 2 through 8 and provides insight into issues raised by the user.

Several finite element models were developed by the user for the validation effort, including a direct shear test model, a modulus failure test model, and a shear failure test model. These models were intended to replicate soil testing performed at the user's facility. For several reasons, which are discussed throughout the report, this report concentrates on the direct shear test model and on providing an engineering-based understanding of the 18 parameters required for the soil material model.

Preliminary calculations generated during the validation effort are documented in appendixes A and B. These include initial experience with the soil model and verification of the results on different computer platforms.

All simulations performed by the user and reported in this document were performed using LS-DYNA, Version 970 Beta, Revision 1812, compiled by Livermore Software Technology Corporation (LSTC), June 7, 2002, on both Personal Computer (PC) Microsoft® Windows®- and Silicon Graphics, Inc. (SGI® ) UNIX®-based machines.

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