论文部分内容阅读
在修正剑桥模型的基础上,提出了一个非饱和土毛细滞回与骨架变形耦合的弹塑性本构模型。该模型考虑了基质吸力与饱和度对屈服应力的影响,可以同时描述非饱和土的弹塑性变形特性与毛细循环滞回效应。根据塑性体变的产生使非饱和土进气值增大的特点,建立了变形对土-水特征曲线影响的数学描述。该模型有效地考虑了饱和度对前期屈服应力的作用,准确地反映了土体在不同土-水状态条件下(脱湿和吸湿过程)强度特性的变化,而且还可以有效地描述水力循环历史对土体变形的影响。通过与试验数据对比,证明了该模型能够模拟非饱和土的主要力学特性。
Based on the correction of the Cambridge model, an elasto-plastic constitutive model coupled with the capillary hysteresis and the skeleton deformation of unsaturated soil is proposed. The model considers the influence of the matrix suction and saturation on the yield stress and can simultaneously describe the elasto-plastic deformation behavior and the capillary loop hysteresis behavior of unsaturated soils. According to the characteristics of plastic body changing and increasing the infiltration value of unsaturated soil, the mathematical description of the effect of deformation on soil-water characteristic curve is established. The model effectively considers the effect of saturation on the yield stress in the early stage and accurately reflects the change of the strength characteristics of soils under different soil-water conditions (desorption and moisture absorption), but also effectively describes the history of the hydraulic cycle Impact on soil deformation. By comparing with experimental data, it is proved that the model can simulate the main mechanical properties of unsaturated soils.