横观各向同性沥青路面结构动力响应分析
发布时间：2018-08-14 13:04
【摘要】：荷载作用下路面各结构层的力学行为不同,粒状类材料(碎石等)及土质材料对力的作用有很大的敏感性,方向依赖性比较强,采用横观各向同性的弹性模型来预测粒状类基层和土基,并用行驶车辆的瞬态动载荷代替传统的静载,能更好地预测路面结构的使用性能,对长寿命路面结构设计的进一步研究具有非常重要的意义。 本文首先建立了横观各向同性路基在FWD脉冲荷载作用下的三维有限元模型,利用有限元动力学的基本原理对FWD荷载作用下土基表面距载荷中心点不同距离各传感器点的弯沉与荷载中心不同深度处的应力,以及路基材料的各向异性对其的影响进行了分析评价。采用动载比静载更符合实际,预测结果更接近于路基路面的实际响应状况,能为路基路面工程结构的施工和进一步研究提供依据。 其次,考虑碎石基层的各向异性特性,其他层为各向同性弹性体,建立横观各向同性碎石基层沥青路面结构在移动荷载作用下的三维有限元三层弹性体系模型,研究了沥青路面各结构层的动力响应分析。 最后,考虑土基的各向异性特征,对其他层考虑各向同性弹性特征,讨论动荷载运行至路面模型中央时,土基的横观各向同性以及不同类型、大小的瞬态荷载对轴载中心点处路面表面弯沉、级配碎石基层底部拉应力和土基顶部压应力的影响,为超载的控制和路面使用寿命的延长有很好的指导作用。
[Abstract]:The mechanical behavior of each structure layer is different under load. Granular materials (gravel, etc.) and soil materials have a great sensitivity to the force, and the direction dependence is relatively strong. The transversely isotropic elastic model is used to predict the granular base and soil foundation, and the transient dynamic load of moving vehicle is used to replace the traditional static load, which can better predict the performance of pavement structure. It is of great significance to further study the design of long-life pavement structure. In this paper, a three-dimensional finite element model of transversely isotropic subgrade under FWD pulse load is established. By using the basic principle of finite element dynamics, the deflection of the soil foundation surface at different distances from the center of the load and the stresses at different depths of the load center under FWD loading are investigated. The influence of anisotropy of subgrade material on it is analyzed and evaluated. The dynamic load is more in line with the reality than the static load, and the predicted results are closer to the actual response of the subgrade and pavement, which can provide the basis for the construction and further study of the subgrade and pavement engineering structure. Secondly, considering the anisotropy of crushed stone base, the other layers are isotropic elastomer, and the three-dimensional finite element three-layer elastic system model of asphalt pavement structure with transversely isotropic gravel base under moving load is established. The dynamic response analysis of each structure layer of asphalt pavement is studied. Finally, considering the anisotropic characteristics of soil foundation and the isotropic elastic characteristics of other layers, the transversely isotropic and different types of soil foundation are discussed when the dynamic load is running to the center of the pavement model. The influence of transient load on the surface deflection of the pavement at the center of axial load, the tensile stress at the base of graded crushed stone and the compressive stress at the top of the soil foundation has a good guiding effect on the control of overload and the prolongation of pavement service life.
【学位授予单位】：太原科技大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：U416.217
本文编号：2182939
[Abstract]:The mechanical behavior of each structure layer is different under load. Granular materials (gravel, etc.) and soil materials have a great sensitivity to the force, and the direction dependence is relatively strong. The transversely isotropic elastic model is used to predict the granular base and soil foundation, and the transient dynamic load of moving vehicle is used to replace the traditional static load, which can better predict the performance of pavement structure. It is of great significance to further study the design of long-life pavement structure. In this paper, a three-dimensional finite element model of transversely isotropic subgrade under FWD pulse load is established. By using the basic principle of finite element dynamics, the deflection of the soil foundation surface at different distances from the center of the load and the stresses at different depths of the load center under FWD loading are investigated. The influence of anisotropy of subgrade material on it is analyzed and evaluated. The dynamic load is more in line with the reality than the static load, and the predicted results are closer to the actual response of the subgrade and pavement, which can provide the basis for the construction and further study of the subgrade and pavement engineering structure. Secondly, considering the anisotropy of crushed stone base, the other layers are isotropic elastomer, and the three-dimensional finite element three-layer elastic system model of asphalt pavement structure with transversely isotropic gravel base under moving load is established. The dynamic response analysis of each structure layer of asphalt pavement is studied. Finally, considering the anisotropic characteristics of soil foundation and the isotropic elastic characteristics of other layers, the transversely isotropic and different types of soil foundation are discussed when the dynamic load is running to the center of the pavement model. The influence of transient load on the surface deflection of the pavement at the center of axial load, the tensile stress at the base of graded crushed stone and the compressive stress at the top of the soil foundation has a good guiding effect on the control of overload and the prolongation of pavement service life.
【学位授予单位】：太原科技大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：U416.217
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