路德春, 罗磊, 王欣, 杜修力. 土与结构接触面土体软/硬化本构模型及数值实现[J]. 工程力学, 2017, 34(7): 41-50. DOI: 10.6052/j.issn.1000-4750.2016.01.0072
引用本文: 路德春, 罗磊, 王欣, 杜修力. 土与结构接触面土体软/硬化本构模型及数值实现[J]. 工程力学, 2017, 34(7): 41-50. DOI: 10.6052/j.issn.1000-4750.2016.01.0072
LU De-chun, LUO Lei, WANG Xin, DU Xiu-li. SOFTENING/HARDENING CONSTITUTIVE MODEL FOR SOIL-STRUCTURE INTERFACE AND NUMERICAL IMPLEMENTATION[J]. Engineering Mechanics, 2017, 34(7): 41-50. DOI: 10.6052/j.issn.1000-4750.2016.01.0072
Citation: LU De-chun, LUO Lei, WANG Xin, DU Xiu-li. SOFTENING/HARDENING CONSTITUTIVE MODEL FOR SOIL-STRUCTURE INTERFACE AND NUMERICAL IMPLEMENTATION[J]. Engineering Mechanics, 2017, 34(7): 41-50. DOI: 10.6052/j.issn.1000-4750.2016.01.0072

土与结构接触面土体软/硬化本构模型及数值实现

SOFTENING/HARDENING CONSTITUTIVE MODEL FOR SOIL-STRUCTURE INTERFACE AND NUMERICAL IMPLEMENTATION

  • 摘要: 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。

     

    Abstract: This paper proposes a constitutive model for soil-structure interfaces by combining the tangential stress-strain relation and normal stress-strain relation of contact surface soils. Based on the analysis of the deformation properties of the soil-structure interface and the shear slip plane of the soil on the interface corresponding to octahedral surfaces under unit body 3D stress states, the tangential stress-strain relation is established by applying the 3D elastoplastic constitutive model for soils to the octahedral surface. The normal compressive deformation of the soil on the interface is similar to that of side-limit condition. Therefore, the normal stress-strain relationship of the soil on the interface is established on the basis of the loading-deformation relation under the side-limit condition. The proposed constitutive model has only four material parameters with clear physical meanings. These four parameters can be determined through the isotropic compression test and the conventional triaxial compression test. Comparisons between the proposed constitutive model and test results of the soil on the interface indicate that the model is capable of reasonably describing the tangential softening and hardening characteristics and normal deformation rules of the soil on the surface. Furthermore, the proposed model is integrated in the general finite element package ABAQUS via FRIC to simulate the deformation process of the soil on the interface. The simulations show that the FRIC subroutine is able to reflect the nonlinear mechanical behavior of the soil-structure interface.

     

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