- Title
- Finite element simulation of an embankment on soft clay: case study
- Creator
- Chai, Jinchun; Igaya, Yutaka; Hino, Takenori; Carter, John
- Relation
- Computers and Geotechnics Vol. 48, p. 117-126
- Publisher Link
- http://dx.doi.org/10.1016/j.compgeo.2012.10.006
- Publisher
- Pergamon Press
- Resource Type
- journal article
- Date
- 2013
- Description
- Numerical simulations and field measurements of an embankment constructed on a deposit of soft Ariake clay in Saga, Japan are compared and discussed. The simulations were made both before (Class-A) and after (Class-C) the field data became known. It is shown that the Class-A prediction resulted in poor simulations of the measured settlement–time curves, mainly due to over-estimation of the magnitude of the yield stresses of the subsoils (i.e., the sizes of the yielding loci) and under-estimation of the compressibility, hydraulic conductivity and the slope (M) of the critical state line. It is demonstrated that: (a) appropriate site investigation, soil testing and interpretation of the test results are essential for accurate prediction of the behaviour of an earth structure constructed on soft clayey deposits; (b) when using a soil model developed within the framework of Critical State Soil Mechanics to make such predictions, M value should be directly determined from tests with an appropriate effective stress path; and (c) yield stresses of soft soil layers can be calibrated by comparing the predicted undrained shear strengths (Su) with measured values, provided the effect of strain rate and/or strain softening on the value of Su is properly considered. The results of this analysis indicate that Bjerrum’s strain rate correction factor can be adopted as a first approximation of the correction factor applied to field or laboratory measured values of Su.
- Subject
- soft ground; finite element analysis; embankment; case history
- Identifier
- http://hdl.handle.net/1959.13/1307141
- Identifier
- uon:21343
- Identifier
- ISSN:0266-352X
- Language
- eng
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