车载作用下含孔充水混凝土路面动态响应分析

发布时间：2018-07-03 21:14

本文选题：傅里叶变换 + TRM方法　；参考：《石家庄铁道大学》2015年硕士论文

【摘要】：混凝土路面被广泛应用于高等级公路的建设,混凝土结构的含孔情况及车辆的行驶速度对于混凝土路面的使用寿命有一定的影响。混凝土结构具有弹性特性,并含有一定的孔隙。但多数对于混凝土路面的研究中没有考虑结构的含孔并充水情况。因此有必要考虑混凝土路面结构含孔并充水的情况,研究车载作用在结构表面时的动力响应。基于Biot理论,运用理论方法分析了受移动矩形荷载作用下的饱和弹性半空间的动力响应,采用傅里叶积分变换的方法求解饱和半空间的运动微分方程,分析渗透系数和荷载移动速度对垂直位移和超孔隙水压力的影响。结果表明,荷载以低于结构剪切波速的恒定速度移动时,饱和弹性半空间模型的垂直位移在一定范围内随着渗透系数的增大而增大,超孔隙水压力在一定范围内随着渗透系数的增大而减小。借助ABAQUS软件建立弹性半空间模型进行计算,采用Dload子程序来施加移动荷载。分析渗透系数和荷载移动速度对模型的垂直位移和超孔隙水压力的影响,所得结果与用理论方法得到的结果能能够较好的相符。对受移动矩形荷载作用下的层状饱和混凝土路面体系进行理论分析,采用傅里叶变换和TRM方法求解层状体系的动力响应,分析讨论渗透系数和荷载的速度对含孔层状体系的垂直位移和超孔隙水压力的影响。结果表明,渗透系数不变时,在一定的速度范围内层状饱和混凝土路面模型的垂直位移随着车载移动速度的增大而减小,超孔隙水压力说着车载移动速度的增大而增大。借助ABAQUS软件创建层状饱和混凝土路面体系模型,采用Dload子程序来施加移动荷载,分析车载移动速度和渗透系数对模型的垂直位移和超孔隙水压力的影响,所得结果与用理论方法得到的结果能够较好的相符。
[Abstract]:Concrete pavement is widely used in the construction of high grade highway. The hole in concrete structure and the driving speed of vehicle have a certain influence on the service life of concrete pavement. Concrete structures have elastic properties and contain certain pores. However, most of the researches on concrete pavement do not consider the structure with holes and filled with water. Therefore, it is necessary to study the dynamic response of the vehicular action on the surface of concrete pavement when it contains holes and fills water. Based on Biot's theory, the dynamic response of saturated elastic half-space under moving rectangular loads is analyzed, and the differential equation of motion in saturated half-space is solved by Fourier integral transform. The effects of permeability coefficient and load moving velocity on vertical displacement and excess pore water pressure are analyzed. The results show that the vertical displacement of the saturated elastic half-space model increases with the increase of the permeability coefficient in a certain range when the load moves at a constant velocity below the shear wave velocity of the structure. The excess pore water pressure decreases with the increase of permeability coefficient in a certain range. The elastic half-space model is established by Abaqus software and the load subroutine is used to apply the moving load. The effects of permeability coefficient and load moving velocity on the vertical displacement and excess pore water pressure of the model are analyzed. The results obtained are in good agreement with the results obtained by the theoretical method. The layered saturated concrete pavement system subjected to moving rectangular loads is theoretically analyzed. Fourier transform and TRM method are used to solve the dynamic response of layered concrete pavement. The effects of permeability coefficient and load velocity on vertical displacement and excess pore water pressure of porous layered system are analyzed and discussed. The results show that the vertical displacement of the layered saturated concrete pavement model decreases with the increase of the vehicle moving speed when the permeability coefficient is constant, and the excess pore water pressure increases with the increase of the vehicle moving speed. The system model of layered saturated concrete pavement is created by Abaqus software, and the load subroutine is used to apply moving load. The influence of moving speed and permeability coefficient on vertical displacement and excess pore water pressure of the model is analyzed. The results obtained are in good agreement with the results obtained by the theoretical method.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.2

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