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Geomechanics and Engineering Volume 20, Number 5, March10 2020 , pages 371-384 DOI: https://doi.org/10.12989/gae.2020.20.5.371 |
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Settlement prediction for footings based on stress history from Vs measurements |
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Hyung Ik Cho, Han Saem Kim, Chang-Guk Sun and Dong Soo Kim
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| Abstract | ||
| A settlement prediction method based on shear wave velocity measurements and soil nonlinearity was recently developed and verified by means of centrifuge tests. However, the method was only applicable to heavily overconsolidated soil deposits under enlarged yield surfaces. In this study, the settlement evaluation method was refined to consider the stress history of the sublayer, based on an overconsolidation ratio evaluation technique, and thereby incorporate irrecoverable plastic deformation in the settlement calculation. A relationship between the small-strain shear modulus and overconsolidation ratio, which can be determined from laboratory tests, was adopted to describe the stress history of the subsurface. Based on the overconsolidation ratio determined, the value of an empirical coefficient that reflects the effect of plastic deformation over the elastic region is determined by comparing the overconsolidation ratio with the stress increment transmitted by the surface design load. The refined method that incorporate this empirical coefficient was successfully validated by means of centrifuge tests, even under normally consolidated loading conditions. | ||
| Key Words | ||
| settlement; footings; shear wave velocity; overconsolidation ratio; centrifuge modelling | ||
| Address | ||
| Hyung Ik Cho, Han Saem Kim and Chang-Guk Sun: Earthquake Research Center, Korea Institute of Geoscience and Mineral Resources,124 Gwahak-ro, Yuseong-gu, Daejeon 34132, Republic of Korea Dong Soo Kim: Department of Civil and Environmental Engineering, Korea Advanced Institute for Science and Technology,291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea | ||