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基于土与结构接触面变形特性分析,将接触面土体的剪切滑动面与单元体三维应力状态下的八面体面相对应,通过土的三维弹塑性本构模型在八面体面上的剪切应力-应变关系,建立了接触面土体剪切应力-应变关系;将接触面土体法向压缩变形与侧限压缩条件相对应,通过侧限压缩条件下的荷载变形关系,建立了接触面土体法向应力-应变关系;进一步将接触面土体切向与法向耦合,建立了接触面土体本构模型,模型只有4个材料参数,参数物理意义明确,可由等向压缩试验和常规三轴压缩试验确定。与接触面土体试验结果的对比分析表明,所建立的本构模型可较好地描述接触面土体切向软/硬化特性与法向变形规律。结合有限元软件ABAQUS,编制了FRIC模型子程序,通过模拟土与结构界面剪切滑移过程表明,编制的FRIC子程序可较好地模拟土与结构界面接触的非线性力学行为。
Based on the analysis of the deformation characteristics of the contact surface between soil and structure, the shear sliding surface of the contact soil corresponds to the octahedron surface under the three-dimensional stress state of the unit body, and the three-dimensional elastoplastic constitutive model of the soil is cut on the octahedral surface Stress-strain relationship, the shear stress-strain relation of soils is established. Correspondingly, the normal compressive deformation of soil on the contact surface corresponds to the confined compression condition. By means of the load-deformation relationship under the confined compression condition, the contact surface Soil normal stress-strain relationship. Further, the tangential direction of the soil contact surface is coupled with the normal direction, and the soil constitutive model of the contact surface is established. The model has only four material parameters, and the physical meaning of the parameters is clear. Conventional triaxial compression test to determine. Compared with the test results of the contact soil, the constitutive model established can well describe the tangential soft / solidification characteristics and normal deformation of the contact soil. Combined with the finite element software ABAQUS, a subroutine of FRIC model was developed. By simulating the shear-slip process of soil-structure interface, it is shown that the FRIC subroutine can simulate the nonlinear mechanical behavior of soil-structure interface.