A New Method to Simulate Stress–Strain Relations from Multiple-Step Loading Triaxial Compression Test Results

Multiple-step loading (ML) on a single specimen can be used to determine the peak compressive strengths at different confining pressures (s'hS) of cement-mixed gravel (CMG) very similar to those obtained by single-step loading (SL) drained triaxial compression (TC) tests. However, only the unload/reload stress–strain relations at different s'hS (except for the primary loading one at the first step) can be obtained from a ML test and the reloading relations become softer with an increase in the negative irreversible axial strain increment that has taken place during respective immediately preceding unloading regimes. This effect gradually decreased during reloading while it totally disappeared once large-scale yielding started. An empirical equation was developed to derive undamaged reloading stress–strain curves (URCs) by removing the damage effects from ML TC test measured reloading curves (MRCs). A new simple method was developed in the framework of proportional rule to simulate primary loading curves (PLCs) at different s'hS from the MRCs from a given ML TC test using a correlation factor. A practical procedure for simulation of PLCs in a ML test were established and applied to generate PLCs in a ML test increasing s'h and a ML test decreasing s'h. The method was validated by comparing the PLCs simulated from the results of a pair of ML tests increasing and decreasing s'h with those measured in a set of SL TC tests at different s'hS.

• Record URL:
  • https://doi.org/10.1520/GTJ20130005
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/01496115
• Supplemental Notes:
  • © ASTM International 2013. All rights reserved. This material may not be reproduced or copied, in whole or part, in any printed, mechanical, electronic, film, or other distribution and storage media, without the written consent of the publisher.
• Authors:
  • Taheri, A
  • Tatsuoka, F
• Publication Date: 2013-11

Language

• English

Media Info

• Media Type: Print
• Features: Figures; Glossary; References;
• Pagination: pp 799-810
• Serial:
  • Geotechnical Testing Journal
  • Volume: 36
  • Issue Number: 6
  • Publisher: ASTM International
  • ISSN: 0149-6115
  • EISSN: 1945-7545
  • Serial URL: https://www.astm.org/products-services/standards-and-publications/geotechnical-testing-journal.html

Subject/Index Terms

• TRT Terms: Cement; Compression tests; Compressive strength; Confining pressure; Deformation curve; Gravel; Loads; Triaxial shear tests
• Subject Areas: Geotechnology; Highways; Materials; I40: Soils and Rocks;

Filing Info

• Accession Number: 01503139
• Record Type: Publication
• Files: TRIS
• Created Date: Jan 3 2014 11:28AM