轮载和水耦合作用下水泥混凝土路面板脱空动力响应分析

Dynamic response analysis of cement concrete pavement under coupling action of tire load and water

为了研究水泥混凝土路面板底脱空区水损害的相关理论,控制和预防板底脱空的扩展和出现,采用数值仿真分析的方法,针对水泥混凝土路面板不同脱空状态、不同脱空面积、不同车辆轴载,考虑真实轮胎荷载模型,运用有限元软件ADINA建立轮载-水-水泥混凝土路面板有限元模型,并对其进行数值仿真分析。结果表明:水泥混凝土路面板含水脱空区域面层的弯沉和弯拉应力明显大于非脱空区域,且角隅脱空区域面层弯沉和弯拉应力比纵缝脱空区域大,而纵缝脱空区域基层滞留水对基层所产生的弯沉和动水压力明显大于角隅脱空区域;角隅脱空区域和纵缝脱空区域路面板随着脱空面积的增大,脱空区域基层弯沉和动水压力逐渐增大,且在相同的脱空面积情况下,板纵缝脱空区域的基层动力响应明显大于角隅脱空区域;随着车辆轴载的增加,脱空区域内含水基层动力响应逐渐增大。采取交通管制、及时注浆或者灌浆和降低轴载等补救措施,可以有效减缓含水脱空区域水泥混凝土路面板结构的破坏。

In order to study the related theory of water damage in the bottom of cement concrete pavement,control and prevent the expansion and emergence of void in the bottom of pavement,the method of numerical simulation analysis is adopted. Aiming at different void states,different void areas,different vehicle axle loads of cement concrete pavement,the real tire load model is considered. The finite element model of tire load-water-cement concrete pavement is established by using AIDNA finite element software,and the numerical simulation analysis is carried out. The results show that the deflection and bending stress of the surface layer of cement concrete pavement with containing water void area are obviouslylarger than no void area. The deflection and bending stress of surface layer which are in void corner area are larger than those of the longitudinal seam void area,and the base retention water of longitudinal seam void area to the deflection and dynamic water pressure of base course producing are obviously greater than those of the void corner area. With the corner and longitudinal seam void area increasing,the deflection and dynamic water pressure of void area base course gradually increase,and the base course dynamic response of longitudinal seam void area is significantly greater than that of void corner area. With the vehicle axle load increasing,the dynamic response of containing water base course gradually increases in void area. Adopting traffic control,timely grouting,reducing the axial load and other remedial measures can effectively slow down the damage of containing water void area cement concrete pavement structure.