公路隧道水泥路面板底脱空有限元分析

Finite Element Analysis on Void beneath Cement Concrete Pavement Slab in Highway Tunnel

建立了公路隧道水泥路面板底脱空结构的三维有限元分析模型,在单轴双轮荷载作用下,对由于板底脱空产生断裂情况下板角顶面最大拉应力和最大竖向位移进行了分析。通过讨论脱空宽度、面板厚度、轴载、基层模量以及基岩模量对板顶最大拉应力和竖向位移的影响,得出脱空宽度、面板厚度和轴载对板角顶面最大拉应力的影响较大,而各个因素对板角顶面最大竖向位移的影响程度差别不大。板角出现脱空时,重载是造成路面损坏的主要原因,通过增加面板的厚度和接缝设置传力杆可以有效防止路面板由于板底脱空造成的损坏。

A linear full three-dimensional finite element model of concrete pavement in highway tunnel was established to analyze the max tensile stress and the max vertical displacement on the slab surface caused by void beneath slab under single-axle double-wheel loads.The influencing factors such as hollow width, slab thickness, axel load, base modulus and bedrock modulus on the max tensile stress and the max vertical displacement were also examined separately.The result reveals that （1） hollow width, slab thickness, and axel load are the main influencing factors on the max tensile stress, while the effects of the main influencing factors on the max vertical displacement are similar; （2） heavy load is the main reason result in pavement damage when there is void beneath slab, so increasing the slab thickness and setting up transferring bars at joint can prevent such damage effectively.