荷载接触形式对路面结构力学指标的影响分析
发布时间：2018-11-03 20:41
【摘要】：传统沥青路面结构力学模型通常将车辆荷载假定为圆形、椭圆形、矩形,与实际路面结构在非均布荷载作用下的真实受力状态有一定的区别。应用3D-Move Analysis有限层软件,建立黏弹性材料特性下力学响应模型,对比分析了静载和动载情况下,不同荷载接触形式对路面结构剪应力、路表弯沉、面层底部拉应力、土基顶部压应变最大值及位置的影响;分析了水平力系数和轴载变化时,各指标最大值的变化规律。结果表明:不同荷载状态、荷载接触形式作用下,各力学指标最大值及位置有较大的区别;汽车匀速行驶时,按照传统静载计算结果进行力学指标设计是偏于安全的;汽车制启动时,计算结果比静载偏大,并随着水平力系数的增加持续增大,仍按传统静载结果设计容易导致车辙、疲劳开裂等早期损坏现象;不同荷载接触形式,各力学指标均随轴载的增加而增大。
[Abstract]:The traditional mechanical model of asphalt pavement usually assumes that the vehicle load is circular, elliptical and rectangular, which is different from the real load state of the actual pavement structure under the action of non-uniform load. The mechanical response model of viscoelastic material under the characteristics of viscoelastic material is established by using 3D-Move Analysis finite layer software. The shear stress of pavement structure, the deflection of pavement surface and the tensile stress at the bottom of the pavement under different load contact forms under static load and dynamic load are compared and analyzed. The influence of the maximum value and position of the compressive strain on the top of the soil foundation; The variation law of the maximum value of each index is analyzed when the horizontal force coefficient and axial load change. The results show that the maximum value and position of each mechanical index are different under different load state and load contact form, and it is safe to design the mechanical index according to the traditional static load calculation results when the vehicle is driving at constant speed. The calculated results are larger than the static load when the automobile starts up, and with the increase of the horizontal force coefficient, it is still easy to cause rutting, fatigue cracking and other early damage phenomena according to the traditional static load design. Each mechanical index increases with the increase of axial load in different load contact forms.
【作者单位】： 湖南大学土木工程学院;
【基金】：国家自然科学基金资助项目(50808077,51278188)
【分类号】：U416.2
，
本文编号：2308986
[Abstract]:The traditional mechanical model of asphalt pavement usually assumes that the vehicle load is circular, elliptical and rectangular, which is different from the real load state of the actual pavement structure under the action of non-uniform load. The mechanical response model of viscoelastic material under the characteristics of viscoelastic material is established by using 3D-Move Analysis finite layer software. The shear stress of pavement structure, the deflection of pavement surface and the tensile stress at the bottom of the pavement under different load contact forms under static load and dynamic load are compared and analyzed. The influence of the maximum value and position of the compressive strain on the top of the soil foundation; The variation law of the maximum value of each index is analyzed when the horizontal force coefficient and axial load change. The results show that the maximum value and position of each mechanical index are different under different load state and load contact form, and it is safe to design the mechanical index according to the traditional static load calculation results when the vehicle is driving at constant speed. The calculated results are larger than the static load when the automobile starts up, and with the increase of the horizontal force coefficient, it is still easy to cause rutting, fatigue cracking and other early damage phenomena according to the traditional static load design. Each mechanical index increases with the increase of axial load in different load contact forms.
【作者单位】： 湖南大学土木工程学院;
【基金】：国家自然科学基金资助项目(50808077,51278188)
【分类号】：U416.2
，
本文编号：2308986
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