Rapid Compression Test of Cement-treated Sands

Tsutomu Namikawa, Hayato Usui

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

During earthquakes, dynamic loads caused by inertia forces are applied to ground improvements by deep mixing method. Therefore, the internal stability of cement-treated soil ground subjected to the seismic loading should be examined in the seismic design of the ground improvement. The speed of the loading caused by the inertia forces during earthquakes is much faster than that in the standard unconfined compression test. It is well known that the loading speed affects the strength of materials. Therefore, the strength under the rapid loading conditions is required to design the ground improvements rationally. The unconfined compression tests of cement-treated soils were conducted under the rapid loading conditions in this study. The rapid load in the shape of a solitary wave is applied to the specimens. The unconfined compression tests with the strain rate of 1%/min were also conducted for comparison. The experimental result indicates that the rapid loading increases the strength by about 20% as compared with the strain controlled loading. The test results were analyzed with the statistical manner to evaluate the variation of the strength of the cement-treated soil specimens prepared in a laboratory. The statistical analysis provides the good understanding of the influence of the data variation on the relationship between the strengths obtained from the rapid loading and strain controlled tests.

Original languageEnglish
Title of host publicationSustainable Design and Construction for Geomaterials and Geostructures - Proceedings of the 5th GeoChina International Conference 2018 – Civil Infrastructures Confronting Severe Weathers and Climate Changes
Subtitle of host publicationFrom Failure to Sustainability, 2018 in HangZhou, China
EditorsBehzad Fatahi, Aron Mwanza, Dave T. Chang
PublisherSpringer Science and Business Media B.V.
Pages26-35
Number of pages10
ISBN (Print)9783319957524
DOIs
Publication statusPublished - 2019
Event5th GeoChina International Conference on Civil Infrastructures Confronting Severe Weathers and Climate Changes: From Failure to Sustainability, 2018 - HangZhou, China
Duration: 2018 Jul 232018 Jul 25

Publication series

NameSustainable Civil Infrastructures
ISSN (Print)2366-3405
ISSN (Electronic)2366-3413

Conference

Conference5th GeoChina International Conference on Civil Infrastructures Confronting Severe Weathers and Climate Changes: From Failure to Sustainability, 2018
Country/TerritoryChina
CityHangZhou
Period18/7/2318/7/25

Keywords

  • Cement-treated Soil
  • Deep Mixing Method
  • Humanitarian Grounds
  • Rapid Loading Tests
  • Unconfined Compression Tests

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Computational Mechanics
  • Geotechnical Engineering and Engineering Geology
  • Environmental Engineering

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