Theoretical Evaluation of the Mechanical Behavior of Unsaturated Soils |
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| Authors: | Michinori Honda Shintaro Ohno Atsushi Iizuka Katsuyuki Kawai Hideki Ohta |
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| Institution: | (1) Nikken Sekkei Civil Engineering Ltd., 1-4-27 Koraku, Bunkyo-ku, Tokyo 112-0004, Japan;(2) Kajima Corporation, Tokyo, Japan;(3) Kobe University, Kobe, Japan;(4) Chuo University, Tokyo, Japan |
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| Abstract: | An evaluation method for the mechanical behavior of unsaturated soils is studied in this paper. Although the mechanical behavior
of unsaturated soils is complicated, a simple modeling is preferable in practice. This is because the soil properties are
not homogeneous and ground data is limited when structures are being designed. In addition, in order to evaluate the reliability
of the design, the physical meanings of the parameters applied in the prediction model should be clear. Firstly, the authors
study the relationship between compaction curves and compression indexes in the unsaturated state that is used in the proposed
constitutive model. Based on the constitutive model, the stress paths for constant volume shear tests are formulated under
a constant void ratio condition and the stress paths for undrained shear tests are calculated under a constant water content
condition. In the case of unsaturated specimens, the volume of these specimens changes with the shear deformation and the
stress paths depend on the initial degree of saturation. The results of the calculation qualitatively describe the test results
by considering the changes in effective confining pressure in the undrained condition and the water retention curves. |
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