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基于非平衡态热力学理论,建立了一种无需屈服面、流动法则等概念的非弹性多物理场力学模型。该模型引入耗散力、耗散流及颗粒熵概念,将土体颗粒层次的耗散机制及其引发的宏观能量耗散统一地描述为一组迁移系数和能量函数模型,从而得到非弹性变形的本构关系。考虑了温升时孔隙内原本无法自由流动的结合水向自由水转化并激发相应能量耗散的过程,以描述饱和土体的非等温固结行为。应用该模型对不同超固结比(OCR)饱和黏性土的非等温固结及温度对不排水剪切的影响进行了模拟并和实测数据进行对比,验证了模型的有效性。模拟结果表明:饱和土体的非等温固结行为与OCR值密切相关,且具有不可逆特性,在循环温度荷载作用下将产生变形累积;而温度对饱和土体不排水剪切强度的影响则依赖于土体类型及OCR值等因素。
Based on the theory of non-equilibrium thermodynamics, a non-elastic multiphysics model that does not require yield surface and flow rule is established. This model introduces the concepts of dissipative force, dissipative flow and particle entropy, and describes the dissipation mechanism of soil particle level and the macroscopic energy dissipation induced by it uniformly as a set of migration coefficient and energy function model to obtain inelastic deformation Constitutive relationship. The process of transforming free water into free water and stimulating the corresponding energy dissipation is considered when the temperature is rising to describe the non-isothermal consolidation behavior of saturated soils. The model was used to simulate the non-isothermal consolidation and the effect of temperature on the undrained shear of OCR saturated clays and compared with the measured data to verify the effectiveness of the model. The simulation results show that the non-isothermal consolidation behavior of saturated soils is closely related to the OCR value and has irreversible characteristics, which will cause deformation and accumulation under cyclic temperature loading. The effect of temperature on the undrained shear strength of saturated soils depends on Soil types and OCR values and other factors.