An Elasto-viscoplastic Constitutive Model with Strain-softening for Soft Sedimentary Rocks |
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Affiliation: | 1. Kyoto Univ., Principal Director, Geo-Institute, Osaka, Japan.;2. Dept. of Civil and Earth Resources Engineering, Kyoto Univ., Kyoto, Japan.;3. Taisei Construction Co., Tokyo, Japan. |
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Abstract: | In general, soft sedimentary rocks exhibit strain-softening and time-dependent behavior. In the present paper, an elasto-viscoplastic constitutive model for soft rocks is proposed, that can universally describe time-dependent behavior such as creep, stress relaxation and strain rate sensitivity by extending Adachi and Oka's elasto-viscoplastic model for frozen sand. It is found that the proposed model can be applied to the time-dependent behavior of a soft tuffaceous rock called Tomuro Stone under the strain rate constant triaxial compression, drained triaxial creep and undrained triaxial stress relaxation. |
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