水泥混凝土路面脱空影响的数值模拟分析

以兰海高速公路（G75）南间至钦州段工程为依托，运用三维弹塑性有限元数值模拟，在对运营期桥头跳车、路面脱空、错台进行分析的基础上，结合施工实际，对水泥混凝土路面破裂成因及破裂缝的发展过程和影响范围进行了研究。三个方向边缘中点的应力呈不规则波动变化，当脱空达到一定状态时，三个方向的应力达到最大，随着分析步的推进，应力最终达到稳定状态。

The Numerical Simulation Analysis of Pavement Slab with Cavity of Cement Concrete Pavement

The fracture causes of cement concrete pavement and its development process and influence range are researched according to construction practice after analyzing bump at bridge-head, pavement slab with cavity and faulting of slab ends existing during operation of Nanjian-Qinzhou Section of Lanzhou-Haikou Expressway (G75) by 3D elastic and plastic FEM numerical simulation. The results show that the stress at the midpoint of the edges in three directions is changed irregularly; when the pavement slab with cavity reaches a certain state, the stress in three directions reaches the maximum. With the advancing of the analysis step, the stress finally reaches the steady state.