冻黏土界面层单调剪切数值模拟及实验对比分析  

Comparative Analysis of Monotonic Shearing Test and Numerical Simulation for Interface Layer of Frozen Soil

作　　者：孙厚超[1] 马爱群[1] 杨平[2] 张飞[1] SUN Houchao;MA Aiqun;YANG Ping;ZHANG Fei(College of Civil Engineering,Yancheng Institute of Technology,Yancheng 224051,China;College of Civil Engineering,Nanning Forestry University,Nanjing 210037,China)

机构地区：[1]盐城工学院土木工程学院,江苏盐城224051 [2]南京林业大学土木工程学院,南京210037

出　　处：《森林工程》2022年第2期133-139,共7页Forest Engineering

基　　金：国家自然科学基金资助项目(51278251);江苏省建设系统科技项目(2021ZD08)。

摘　　要：为研究冻土界面层的单剪力学性质,基于有限元数值模拟技术(ABAQUS)软件Goodman单元,利用软件二次开发功能,自定义冻土界面层弹塑性损伤本构关系,建立基于冻土界面层剪切试验的有限元模型,实现冻土界面层的剪切试验数值模拟。通过数值模拟分析和试验对比得出:(1)冻土界面层有限元模型数值模拟剪切试验,将计算结果与试验进行对比,两者间具有一致性;(2)冻土界面层模拟剪切时,剪应力随剪位移达到峰值剪应力后过渡到平稳剪切阶段;模拟峰值剪应力、模拟稳定剪应力随着法向应力增大而增大,冻土界面层的模拟抗剪强度与法向应力具有较好的线性关系,可用摩尔-库仑理论描述;(3)结构面粗糙度、冻土温度和法向应力等因素对冻土界面层力学特性具有重要影响。研究结果对冻土界面层力学特性问题提供新的研究方法和路径。In order to study the monotonic shear mechanical properties of frozen soil interface layer,based on Goodman element of ABAQUS software,the FEA model for shearing test of frozen soil-structure interface is created by means of secondary development function and self-defined damage constitutive equation.Then numerical simulation of shear test of frozen soil-structure interface is implemented.By contrast with experimental test,the following results can be obtained:(1)The finite element model of frozen soil interface layer numerically simulates the shear test,and the calculated results are consistent with the test.(2)When simulating the shear of frozen soil interface layer,the shear stress reaches the peak with the shear displacement,and then transits to the steady shear stage.The simulated peak shear stress and simulated stable shear stress increase with the increase of normal stress.The simulated shear strength of frozen soil interface layer has a good linear relationship with normal stress,which can be described by Mohr coulomb theory.(3)Structural surface roughness,frozen soil temperature and normal stress have important effects on the mechanical properties of frozen soil interface layer.The research results provide a new research method and path for the mechanical properties of frozen soil interface layer.

关 键 词：接触界面层 单调剪切 冻黏土 数值模拟 物理试验 

分 类 号：TU435[建筑科学—岩土工程]