MONOTONIC AND CYCLIC BEHAVIOR OF UNSATURATED SANDY SOIL UNDER DRAINED AND FULLY UNDRAINED CONDITIONS

• KIMOTO SAYURI

  Department of Civil and Earth Resources Engineering, Kyoto University

• OKA FUSAO

  Department of Civil and Earth Resources Engineering, Kyoto University

• FUKUTANI JUNYA

  Department of Civil and Earth Resources Engineering, Kyoto University

• YABUKI TAICHI

  Department of Civil and Earth Resources Engineering, Kyoto University

• NAKASHIMA KOUSUKE

  Department of Civil and Earth Resources Engineering, Kyoto University

抄録

Changes in air pressure during monotonic and cyclic loading are in some cases important for the behavior of unsaturated soil. For example, in order to investigate the stability of embankments and slope failure during earthquakes, it is necessary to consider the effect of the pore air or the pore gas pressure as well as the pore water pressure and the interaction between the soil and the pore fluids. In the present study, we carried out a series of monotonic and cyclic loading tests on sandy soil used for the improvement of river embankments. The effects of the initial suction, the confining pressure, and the degree of compaction under fully undrained conditions, namely, constant water and constant air shearing tests, as well as under drained conditions for both air and water, were studied. For the stress variables of the unsaturated soil, the skeleton stress was used to describe the experimental results and was defined as the difference between the total stress tensor and the average pore pressure of water and gas (Oka et al., 2010). From the monotonic and cyclic test results, we found that the stress-strain behavior of unsaturated sandy soil strongly depends on the initial suction, especially under fully undrained conditions, due to the difference in pore pressures. In the cyclic loading tests under fully undrained conditions, the mean skeleton stress decreased due to the increase in air pressure and led to the failure of the specimen in the case of a lower level of initial suction. In addition, the test results exhibited the strain rate effect on the stress-strain behavior during cyclic loading under fully undrained conditions.<br>

収録刊行物

• ＳＯＩＬＳ　ＡＮＤ　ＦＯＵＮＤＡＴＩＯＮＳ

  ＳＯＩＬＳ　ＡＮＤ　ＦＯＵＮＤＡＴＩＯＮＳ 51 (4), 663-681, 2011

  公益社団法人 地盤工学会

キーワード

• cyclic loading
• laboratory test
• sand
• suction
• triaxial test
• unsaturated soil
• (<b>IGC</b>: D6)

詳細情報

• CRID: 1390001204666430336
• NII論文ID: 130004552484
• DOI: 10.3208/sandf.51.663
• ISSN: 18811418
• ISSN: 00380806
• Web Site: https://api.elsevier.com/content/article/PII:S0038080620301414?httpAccept=text/xml
• Web Site: https://api.elsevier.com/content/article/PII:S0038080620301414?httpAccept=text/plain
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可