沥青稳定碎石应力依赖模型的柔性路面结构分析

发布时间：2018-07-08 08:58

本文选题：沥青稳定碎石 + 回弹模量　；参考：《哈尔滨工业大学学报》2017年09期

【摘要】：为建立沥青稳定碎石的非线性应力依赖本构模型,并将该模型应用于路面结构力学分析,提高路面结构分析的准确性.采用动三轴试验模拟不同应力状态,测试沥青稳定碎石的回弹模量,建立材料的非线性应力依赖本构模型;采用Abaqus有限元软件中的UMAT子程序编程并定义沥青稳定碎石的本构模型,进行基于沥青稳定碎石非线性应力依赖本构模型的路面结构数值模拟.结果表明:沥青稳定碎石的回弹模量有着较强的应力依赖特性,在研究所涵盖的应力状态下,其模量最大值为最小值的175%.通过有限元路面结构分析可知,与非线性分析相比,传统的弹性分析低估了沥青稳定碎石基层底部拉应变约10%,低估级配碎石顶部最大压应力约5%.沥青稳定碎石的非线性应力依赖特性显著影响路面分析结果,应在路面结构设计时考虑该特性.
[Abstract]:In order to establish the nonlinear stress-dependent constitutive model of asphalt stabilized macadam, the model is applied to the mechanical analysis of pavement structure to improve the accuracy of pavement structure analysis. The dynamic triaxial test was used to simulate the different stress states, and the elastic modulus of asphalt stabilized macadam was measured, and the nonlinear stress-dependent constitutive model of the material was established. The UMAT subroutine of Abaqus finite element software is used to program and define the constitutive model of asphalt stabilized macadam, and the numerical simulation of pavement structure based on nonlinear stress-dependent constitutive model of asphalt stabilized macadam is carried out. The results show that the modulus of resilience of asphalt stabilized macadam has a strong stress-dependent property, and the maximum modulus of asphalt stabilized macadam is 17555 of the minimum value under the stress state covered by the study. Compared with the nonlinear analysis, the traditional elastic analysis underestimates the tensile strain at the base of asphalt stabilized macadam about 10 and the maximum compressive stress at the top of graded crushed stone about 5. The nonlinear stress-dependent characteristics of asphalt stabilized macadam significantly affect the pavement analysis results, which should be taken into account in the design of pavement structure.
【作者单位】：长安大学公路学院;新疆交通建设集团股份有限公司;湖南大学土木工程学院;
【分类号】：U416.2

【相似文献】