基于双参数屈服函数的黏土和砂土非正交单屈服面模型

doi:10.13722/j.cnki.jrme.2020.0096

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Abstract A non-orthogonal single yield surface model for clays and sands is proposed based on the critical state soil mechanics，while，and a state-dependent hardening rule including parameters of and is developed for the sub-loading surface by considering the effects of the stress level and the relative density. The proposed model is quite simple in the formula and is capable of describing the strain-softening and dilative features of over consolidated clays and dense sands. In the plane，the relative position between the current mean effective stress and the critical state mean effective stress is represented by the pressure state parameter，while the void difference between the current and critical states in the plane is captured by the density state parameter. Both and will approach zero once the material enters the critical state due to yielding. On the other hand，the generalized plastic potential function adopted in the proposed model is integrated by a high-order dilatancy rule，which is extended from the modified Cam-clay dilatancy rule. The plastic potential function contains a dilatancy related parameter a，whose value can be determined by fitting dilatancy curves with the high-order dilatancy rule. Besides，a two-parameter yield function can be developed by introducing an extra parameter into the proposed plastic potential function. Adjusting the value of d，both associated() and non-associated() plastic flow rules can be obtained. The deviation between the plastic flow direction() and the loading direction() increases as the parameter d increases，and at the same time，the strain vector is not normal to the yield surface. With the two-parameter yield function，the proposed model can consider the effect of the yield surface shape on the model prediction. Comparisons between the calculation results by the proposed model and drained triaxial test results of clays and sands show that the developed model can uniformly describe the behaviors of clays and sands. Moreover，adjusting the yield function shape can improve the accuracy of model prediction significantly.

Key words： soil mechanics two-parameter yield function clays sands state parameters constitutive equations

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	Articles by authors
	LI Haichao1
	TONG Chenxi1
	MA Bo1
	ZHANG Sheng1
	2

Cite this article:

LI Haichao1,TONG Chenxi1,MA Bo1, et al. A non-orthogonal single yield surface model for clays and sands based on a two-parameter yield function[J]. , 2020, 39(11): 2319-2327.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0096 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/I11/2319

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