Triple-shear subloading surface models for saturated clayey sand in the nanchang subway

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (10) : 9-20.

HU Xiaorong，LU Xiang，YUAN Hao

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Abstract

Taking the triple-shear strength criterion as the failure criterion, the triple-shear failure stress ratio of saturated soil was derived. Considering the dilatancy of sand, the phase transformation stress ratio was modified by introducing dilatancy state parameters. A new yield function was obtained by replacing the fixed failure stress ratio in the modified Cambridge model with the phase transformation stress ratio. Combining the new yield function with the theory of subloading surface model, the triple-shear subloading surface model for saturated clayey sands was proposed. The underground sand and clay in a section of Nanchang Metro were taken as test soil samples. Clay with particle size of less than 0.075mm was added to the sand to make the clayey sands. The compactness of the sample was set to 70%, and the clay contents were set to 0%, 5% and 10%, and the model parameters were determined by relevant geotechnical tests. The results of constitutive model were compared with those of the conventional static triaxial tests and cyclic dynamic triaxial tests. The results of static triaxial test showed that the calculation results of the constitutive model are basically consistent with the experimental results, which indicates the validity of the constitutive model. Under the same conditions, with the increase of clay content, the shear strength of soil increases, the shear shrinkage stage becomes longer, and the dilatancy phenomenon becomes less obvious. The results of dynamic triaxial tests showed that the numerical calculation curves of the constitutive model are in good agreement with the experimental results. In the initial stage of loading, the plastic strain of soil develops rapidly. With the continuous alternations of loading and unloading and the increasing number of cycles, the hysteresis loops become more and more dense.

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Saturated clayey sands / Triple-shear subloading surface / Triple-shear strength criterion / Constitutive model / Triaxial test

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HU Xiaorong，LU Xiang，YUAN Hao. Triple-shear subloading surface models for saturated clayey sand in the nanchang subway[J]. Journal of Vibration and Shock, 2024, 43(10): 9-20

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