Call number:
ZSP-201-92/17
In:
CRREL Report, 92-17
Description / Table of Contents:
The CRREL Instrumented Vehicle (CIV), shear annulus, direct shear, andtriaxial compression devices were used to characterize the strength ofthawed and thawing soil. These strength values can be used in simpletraction models to predict the tractive performance of vehicles. Strength was evaluated in terms of the parameters c' and Φ' based on the Mohr-Coulomb failure criterion. It is proposed here that an instrumented vehicle is best suited for terrain characterization for mobility studies because the conditions created by a tire slipping on a soil surface are exactly duplicated. The c' and Φ' values from the shear annulus were found to overpredict traction because of the low normal stress applied by the annulus and the curved nature of the failure envelope. Of all the tests, the direct shear test yielded the highest Φ' value, most likely because the test was run at a slow deformation rate under drained conditions. The triaxial test results were the most similar to those from the vehicle. All test methods show Φ' increasingwith soil moisture up to the liquid limit of the soil and then decreasing. As measured with the vehicle, was also found to be strongly influenced by the thaw depth.
Type of Medium:
Series available for loan
Pages:
17 Seiten
,
Illustrationen
Series Statement:
CRREL Report 92-17
URL:
https://apps.dtic.mil/dtic/tr/fulltext/u2/a258263.pdf
URL:
https://hdl.handle.net/11681/9145
Language:
English
Note:
CONTENTS
Introduction
Objective
Background
Strength measurement techniques
Triaxial compression
Direct shear
Shear annulus device
CRREL Instrumented Vehicle
Discussion
Comparison of methods
Influence of soil conditions
Traction prediction
Conclusions
References
Abstract
Location:
AWI Archive
Branch Library:
AWI Library
