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为了很好地描述砂土的应力应变特征,通常利用以临界状态孔隙比为基础的状态参数建立弹塑性本构关系,但是对于密砂排水试验,临界状态参数很难测到。相变状态作为一特征状态,相关参数较容易测得。基于相变状态定义状态参量,并考虑应力诱发的各向异性,建立饱和砂土的边界面本构模型。最后,利用提出的模型参数得到的模拟结果与试验结果相吻合,较好地反映了密砂的应变强化和软化力学特征。
In order to describe the stress-strain characteristics of sand well, elasto-plastic constitutive relations are usually established by using the state parameters based on the critical void ratio. However, for sand drainage tests, the critical state parameters are difficult to measure. Phase transition state as a characteristic state, the relevant parameters easier to measure. The boundary state constitutive model of saturated sands is established based on the state variables defined by phase transitions and stress-induced anisotropy. Finally, the simulation results obtained by using the proposed model parameters are in good agreement with the experimental results, which better reflect the strain hardening and softening mechanical characteristics of sand.