冻结条件下风积土蠕变损伤特性及本构模型研究

发布时间：2018-04-14 13:08

本文选题：道路工程 + 风积土　；参考：《公路交通科技》2015年05期

【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。
[Abstract]:In order to study the creep damage and deformation of aeolian soil under freezing condition, the triaxial creep tests with different stress levels at different freezing temperatures were carried out by using FST-200 type dynamic and static triaxial test machine of frozen soil.The influence of deformation stress and freezing temperature on creep property of aeolian soil is discussed, and the damage evolution equation of deformation modulus varying with time at different temperature is established on the basis of test.An improved Burgers model is established by changing a sticky pot in the Burgers model into a strain-triggered nonlinear sticky pot, and the damage evolution equation of the variation of the deformation modulus with time is introduced into the improved model.The creep damage constitutive model of aeolian soil under freezing condition is established. The creep constitutive equations of one and three dimensional creep are derived and compared with the experimental data to verify the reliability of the model.The results show that the creep deformation is positively related to freezing temperature and deflection stress, and the creep damage constitutive model can reflect the creep deformation of aeolian soil under freezing condition.
【作者单位】：辽宁工程技术大学土木与交通学院;东北大学资源与土木工程学院;沈阳大学建筑工程学院;中交集团第二公路工程局;
【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)
【分类号】：U414

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