饱和土变形过程模拟的统计损伤方法研究

针对传统损伤理论的不足与局限性，从研究岩土材料损伤的合理定义入手，并通过深入探讨饱和土损伤的微观力学机制，建立了适合于饱和土的新型损伤模型。在此基础上，引进统计损伤理论，建立了模拟特定围压下饱和土变形全过程的统计损伤本构模型及其参数确定方法。通过探讨饱和土损伤统计本构模型参数与围压的关系，建立了该模型的合理修正方法，从而建立了反映不同围压条件的统一饱和土损伤统计本构模型。理论与试验结果分析表明了该模型的合理性，该模型不仅能反映饱和土的变形全过程，而且能反映孔隙水压力对饱和土变形的影响。

Study on simulation of deformation process of saturated soils by statistical damage theory

Firstly, aiming at the deficiency and limitation of traditional damage theory and starting with the discussion on rational definition of damage geomaterials, a new damage model suiting for saturated soils is established by discussing the microcosmic mechanical mechanism of damage of saturated soils. Secondly, a statistical damage constitutive model which can simulate the full process of deformation of saturated soils under special confining pressure has been erected by introducing statistical damage theory; and then the method for determining the model’s parameters is also developed based on experimental curves of triaxial compressive test of saturated soils. Finally, a rational revised technique for the model has been developed through investigating the relations between the model’s parameters and the confining pressure. Finally, a unified statistical damage constitutive model for saturated soils has been obtained which can be applied to different confining pressures. It is indicated by comparison between theoretical and experimental results that the model is reasonable which can not only reflect the full process of deformation of saturated soils but the effect of water in soils on the deformation of saturated soils.