人工冻结黏土单轴蠕变及其本构模型
Uniaxial Creep of Artificially Frozen Clay and Its Constitutive Model
林斌 1陈正东 1逯智超1
作者信息
- 1. 安徽理工大学土木建筑学院,淮南 232001
- 折叠
摘要
为探究人工冻结黏土的单轴蠕变试验及其蠕变本构模型,对人工冻结黏土进行室内试验,对不同冻结温度下的试验结果进行对比分析.基于分析结果,在常规模型的基础上进行改良,推导得出弹性模量、黏滞系数等参数值,建立有关时间、应力与温度的冻土蠕变本构方程.根据结果分析可见,随冻结温度降低,抗压强度越高,冻土蠕变变形越小;对于改良的本构模型,通过对比理论值与实际值可知,蠕变发生至最终阶段时,模型计算值大于试验值,这对于实际工程是偏安全的,故所建立的本构模型具有一定物理意义,且在实际工程中具有可行性.
Abstract
In order to investigate the uniaxial creep test of artificially frozen clay and its creep constitutive model,labo-ratory tests were conducted on artificially frozen clay,and the test results at different freezing temperatures were compared and analyzed.Based on the analysis results,the conventional model is improved to derive the elastic modulus,viscosity co-efficient and other parameter values,and establish the creep constitutive equations of frozen soil related to time,stress and temperature.The results show that with the decrease of freezing temperature,the higher the compressive strength,the smaller the creep deformation of frozen soil.For the improved constitutive model,by comparing the theoretical value with the actual value,it can be seen that when creep occurs to the final stage,the calculated value of the model is higher than the experimental value,which is relatively safe for the actual project,so the established constitutive model has a certain physical significance and feasibility in the actual engineering.
关键词
冻结黏土/抗压强度/蠕变/本构方程/Burgers模型Key words
frozen clay/compressive strength/creep/constitutive equation/Burgers model引用本文复制引用
出版年
2024
NETL
NSTL
万方数据