适用于黏土和砂土的亚塑性剑桥模型

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Abstract Considering the similarity of the mechanical behaviors of clay and sand soils，such as the strain softening and dilatancy features exhibited during the drained triaxial test，and the alternating mobility feature induced by cyclic loading under the undrained condition，a new hypoplastic Cam-clay model is established by combining the hypoplastic theory and the critical state soil mechanics. The model first adopts a linear ultimate compression curve to calculate the Hvorslev equivalent stress of sand to determine the asymptotic state boundary surface uniquely. On the other hand，the ultimate compression curve will coincide with the isotropic consolidation compression curve of clay. Second，a new density factor is defined based on the relative positional relationship between the current state point of the soil and the critical state line，which affects the evolution of the normalized stress path of the soil inside the asymptotic state boundary surface. The initial value of the density factor depends on the overconsolidation ratio of the clay or the initial void ratio of the sand，which can be used as a state parameter to describe the effects of factors including stress history，relative density，and loading path on soil behaviors. The proposed model has parameters similar to those of the Cam-clay model，which can be calibrated through conventional laboratory tests. The calculation results indicate that the proposed model can reasonably describe the complex behaviors of clay and sand under drained and undrained shearing conditions，which can also capture the alternating mobility feature during cyclic loading. The validity of the proposed model is further verified by comparing the model predictions with the triaxial test results of Kaolin clay，Karlsruhe fine sand，and Toyoura sand.

Key words： soil mechanics clay sand hypoplastic theory critical state constitutive model

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	Articles by authors
	LI Haichao1
	LI Tao1
	TONG Chenxi2
	HE Zuoyue3
	ZHANG Sheng2

Cite this article:

LI Haichao1,LI Tao1,TONG Chenxi2, et al. Hypoplastic cam-clay model for clay and sand soils[J]. , 2024, 43(12): 3096-3107.

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https://rockmech.whrsm.ac.cn/EN/Y2024/V43/I12/3096

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