An Experimental Study on the Estimation of Field Compaction States and Stress-Strain Properties of Unbound Granular Materials from Laboratory Test Results

Sou Ihara, Kairi Magara, Mitsutaka Okada, Hiroyuki Nagai, Shohei Noda, Yoshiaki Kikuchi, Fumio Tatsuoka

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Field fill materials often contain gravel particles larger than the allowable limit for standard laboratory compaction tests. In such cases, the maximum dry density (ρd)max of a material containing large gravels is obtained by correcting laboratory test results for specimens without large gravels. Usually, the Walker–Holtz (WH) method is used for this correction, but there are many materials whose gravel ratio (P) is 0.3 − 0.4, which is usually considered to be the application limit. Moreover, accurate stress-strain properties under field compaction conditions are necessary for relevant stability analysis of soil structures including embankments. However, with unbound granular materials, it is difficult to obtain undisturbed samples for laboratory tests or to carry out field shear tests. Also, large-scale triaxial compression tests on specimens containing large gravels are difficult to perform in ordinary engineering practices. In this study, a series of laboratory compaction tests were performed changing the maximum particle size (Dmax), compaction energy level (CEL) and P to examine the validity of the WH method and a series of drained triaxial compression tests were performed varying the Dmax and the degree of compaction. Based on the test results, a method to modify the WH method is proposed to properly estimate the (ρd)max value after adding or removing gravel particles when compacted at a certain CEL. Also, a method is proposed to correct the strength for a given gravel ratio to estimate the in-situ strength from the strength obtained from laboratory tests.

Original languageEnglish
Title of host publicationAdvances in Transportation Geotechnics IV - Proceedings of the 4th International Conference on Transportation Geotechnics Volume 3
EditorsErol Tutumluer, Soheil Nazarian, Imad Al-Qadi, Issam I. A. Qamhia
PublisherSpringer Science and Business Media Deutschland GmbH
Pages153-166
Number of pages14
ISBN (Print)9783030772376
DOIs
Publication statusPublished - 2022
Event4th International Conference on Transportation Geotechnics, ICTG 2021 - Chicago, United States
Duration: 23 May 202126 May 2021

Publication series

NameLecture Notes in Civil Engineering
Volume166
ISSN (Print)2366-2557
ISSN (Electronic)2366-2565

Conference

Conference4th International Conference on Transportation Geotechnics, ICTG 2021
Country/TerritoryUnited States
CityChicago
Period23/05/2126/05/21

Keywords

  • Compaction control
  • Gravel content
  • The degree of compaction

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