板底脱空对水泥混凝土路面板动力响应分析

为了分析板底脱空对水泥混凝土路面板的动力响应,基于流固耦合原理建立了考虑板与板相互作用的9块水泥混凝土路面板脱空有限元模型,分析在行车荷载作用下,车辆参数(均布质量、作用面积和运动速度)、路面板参数(路面板厚度、纵横缝分布钢筋等)以及板下地基脱空(不同脱空面积、不同位置以及脱空处不同含水量)对路面结构作用力的影响;探讨了接缝处布设钢筋的9块板水泥混凝土路面结构的动态弯沉、最大弯拉应力和水压力的变化规律.结果表明:无论脱空与否板角隅处脱空区域水泥混凝土路面板顶的表面弯沉、弯拉应力明显大于纵缝脱空区域;弯沉和弯拉应力随着脱空面积的增大而增大;脱空区域不同含水量对板弯沉和弯拉应力影响不大.随着脱空面积的增大,基层脱空区域底面受水压力呈线性增长的趋势,其中板角隅处脱空区域水压力明显大于纵缝脱空区域.

Dynamic Response Analysis of Void Under Slab to Cement Concrete Pavement

To analyze the dynamic response of void under slab to the cement concrete pavement,base on fluid-structure interaction theory,and the finite element model of nine cement concrete pavements which considered the interaction of plate and plate was set up,the influence to the pavement structure of vehicle parameters(uniform quality,function area and movement speed),pavement plate parameters(thickness of pavement plate,distributed rebar of longitudinal seam and cross seam,etc) and foundation void under slab (different void areas, different position and the different water contents of void position) were analyzed under the driving load. The change rules of the dynamic deflection, maximal flexural-tensile stress and water pressure of nine cement concrete pavements which were set rebar at the seams were delved. Results show that no matter whether there is the void, the deflection, flexural-tensile stress and water pressure of cement concrete pavement top surface of the slab corner void area are obviously greater than that of the longitudinal joint void area. The deflection and flexural-tensile stress increase with the increasement of void area. The different water contents of void area have little effect on the deflection and flexural stress of the slab. With the void area increasing, the water pressure of void area bottom of the base course shows the linear growth trend. The water pressure which is in the corner void area of the slab is significantly greater than that of the longitudinal joint void area.