单 位：
南京林业大学土木工程学院;盐城工学院土木工程学院
关键词：
接触界面层;冻黏土;抗剪强度;单调剪切;损伤模型
摘 要：
为探究冻土界面层单剪损伤力学特性,本文根据冻黏土与结构接触界面层单剪力学特性试验结果,基于经典的摩尔库仑准则,将内聚力与摩擦系数作为一个与应力第一不变量相关的函数,建立适合于描述冻土材料破坏的本构模型。通过冻土界面层单剪损伤分析,在模型中引入塑性和损伤等内变量,同时建立与温度和粗糙度等相关影响因素的关系,根据热力学第二定律和正交法则,构建用于描述冻土与结构接触界面层单剪的弹塑性损伤模型。采用开发的冻土界面层单剪本构模型,给出相关的数值求解格式,对于各种工况下所反映出的力学特征进行有限元计算分析,与冻土界面层单剪物理试验进行对比验证,结果表明,所建模型是准确合理的。
译 名：
A Damage Model for Frozen Soil-structure Interface Layer under Monotonic Shearing
作 者：
SUN Houchao;YANG Ping;BU Yingchun;SHI Feiting;College of Civil Engineering, Yancheng Institute of Technology;College of Civil Engineering, Nanjing Forestry University;
关键词：
Interface layer;;frozen soil;;shear strength;;monotonic shear;;damage model
摘 要：
In order to explore the mechanical characteristics of monotonic shear damage of frozen soil interface layer, according to the test of mechanical properties of frozen soil-structure interface and classical Mohr-Coulomb criterion, internal cohesion and friction coefficient are assumed to be a function related to the first invariant of stress, then a constitutive model suitable for describing the failure of frozen soil materials is established. Based on the monotonic shear damage analysis of frozen soil interface layer, some intrinsic variables such as plasticity and damage are introduced into the model, and the relationship between temperature and roughness is established. According to the second law of thermodynamics and orthogonal law, an elastic-plastic damage model is established to describe the monotonic shear layer at the interface between frozen soil and structure. The monotonic shear constitutive model of frozen soil interface layer is developed, and the numerical solution format is given. Comparison of finite element analysis and experimental results under various working conditions shows that the proposed model yields good results.
