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Abstract: The creep and destructuration characteristics of soft clay are always coupled under loading, making it difficult for engineers to determine these related parameters. This paper proposes a simple and efficient optimization procedure to identify both creep and destructuration parameters based on low cost experiments. For this purpose, a simplex algorithm (SA) with random samplings is adopted in the optimization. Conventional undrained triaxial tests are performed on Wenzhou clay. The newly developed creep model accounting for the destructuration is enhanced by anisotropy of elasticity and adopted to simulate tests. The optimal parameters are validated first by experimental measurements, and then by simulating other tests on the same clay. Finally, the proposed procedure is successfully applied to soft Shanghai clay. The results demonstrate that the proposed optimization procedure is efficient and reliable in identifying creep and destructuration related parameters.

This paper presents a parameter identification procedure for identifying both creep and destructuration parameters of soft structured clay. It uses a recently developed elasto viscoplastic constitutive model combing with Simplex method. The highlight is that only the undrained compression triaxial tests together with their consolidation stages are needed in the optimization procedure. For identifying the creep and destructuration parameters, the experimental cost is reduced. The proposed approach is suitable for identifying parameters of advanced constitutive model which always involve many parameters.

一个结构性软土参数的确定方法

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