冻结条件下风积土蠕变损伤特性及本构模型研究  

Study on Creep Damage Characteristics and Constitutive Model of Aeolian Soil under Freezing Condition

作　　者：孙琦[1] 张向东[1] 杨佳[2,3] 马伟 邢洋[1] 

机构地区：[1]辽宁工程技术大学土木与交通学院,辽宁阜新123000 [2]东北大学资源与土木工程学院,辽宁沈阳110819 [3]沈阳大学建筑工程学院,辽宁沈阳110044 [4]中交集团第二公路工程局,陕西西安710075

出　　处：《公路交通科技》2015年第5期61-67,共7页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(50978131);教育部高等学校博士学科点专项科研基金项目(20112121110004);辽宁省教育厅项目(L2013137;L2014136);辽宁工程技术大学生产技术市场调研基金项目(14-T-005)

摘　　要：为了研究风积土在冻结条件下的蠕变损伤变形规律,采用FST-200型冻土动静三轴试验机在不同冻结温度下进行不同应力水平的三轴蠕变试验,探讨了偏应力大小和冻结温度对风积土蠕变性能的影响;在试验的基础上,建立变形模量在不同温度下随时间变化的损伤演化方程;将Burgers模型中的一个黏壶改为应变触发的非线性黏壶,从而建立一个改进的Burgers模型,并将变形模量随时间变化的损伤演化方程引入到该改进模型中,建立冻结条件下风积土的蠕变损伤本构模型,推导了一维和三维蠕变本构方程,并与试验数据进行对比分析,验证了模型的可靠性。研究结果表明:蠕变变形量与冻结温度、偏应力大小正相关,建立的蠕变损伤本构模型能够反映风积土在冻结条件下的蠕变变形规律。In order to study the creep damage deformation of aeolian soil under freezing condition, the triaxial creep creep soil is test under difference stresses is performed at difference temperatures by testing machine. The effect of partial stress and freezing temperature on studied. According to the test result, a damage FST- 200 frozen soil triaxial the creep property of aeolian equation of deformation modulus changing with time at different temperatures is built. A modified Burgers model is established after replacing the ordinary viscosity kettle with the strain triggered nolinear viscosity kettle. The damage evolutiori equation of deformation modulus varying with time is introduced into the improved model, the constitutive equation of creep damage of aeolian soil under freezing condition is established and derived creep constitutive equation of one-dimensional and three-dimensional, and the 1 D and 3D creep constitutive equations is derived2 The result of constitutive model is compared with experimental data to verify its reliability. The result shows that the amount of creep deformation is correlated positively with freezing temperature and the value of partial stress, and the established creep damage constitutive model could condition. reflect the creep deformation of aeolian soil under freezing

关 键 词：道路工程 风积土 蠕变损伤本构模型 三轴蠕变试验 冻结 

分 类 号：U416.12[交通运输工程—道路与铁道工程]