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Geomechanics and Engineering
  Volume 18, Number 5, August10 2019 , pages 459-469

Experimental approach to estimate strength for compacted geomaterials at low confining pressure
Byeong-Su Kim, Shoji Kato and Seong-Wan Park

    It is important to estimate the shear strength of shallow compacted soils as a construction material. A series of constant water content triaxial compression (CWCC) tests under low confining state in this study were performed on compacted geomaterials. For establishing a relationship of the shear strengths between saturated and unsaturated states on compacted geomaterials, the suction stresses were derived by two methods: the conventional suction-measured method and the Suction stress-SWRC Method (SSM). Considering the suction stress as an equivalent confining stress component in the (sigma_net, tau) plane, it was found that the peak deviator stress states agree well with the failure line of the saturated state from the triaxial compression test when the SSM is applied to obtain the suction stress. On the other hand, the cavitation phenomenon on the measurement of suction affected the results of the conventional suction-measured method. These results mean that the SSM is distinctly favorable for obtaining the suction value in the CWCC test because the SSM is not restricted by the cavitation phenomenon. It is expected that the application of the SSM would reduce the time required, and the projected cost with the additional equipment such as a pore water measuring device in the CWCC test.
Key Words
    compacted geomaterials; suction stress-SWRC Method (SSM); suction stress; soil-water retention curve; shear strength
Byeong-Su Kim:Graduate School of Environmental and Life Science, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama City, Okayama 700-8530, Japan

Shoji Kato: Graduate School of Engineering, Kobe University,
1-1 Rokkodai-cho, Nada-ku, Kobe City, Hyogo 657-8501, Japan

Seong-Wan Park:Department of Civil & Environmental Engineering, Dankook University,Jukjeon-ro 152, Suji-gu, Yongin City, Gyeonggi-do 16890, Korea

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