In order to figure out the mechanical response of bridge deck pavement with cracks, under internal dynamic water pressure, using the LS-DYNA finite element analysis software, a model of asphalt pavement with crack was established to analyze the stress state of crack. The results showed that under the action of vehicle dynamic load,the maximum pressure and shear stress of the micro cracks are located at the crack tip, while the maximum tensile stress is located around the crack;the maximum pressure and shear stress have a good linear correlation with the vehicle speed and load level,in the case of 120 km/h velocity and 1.5 MPa load level,the maximum X direction, Y direction pressure and shear stress respectively reach to 0. 472 MPa, 1. 101 MPa and 0.361 MPa, under which micro cracks will expand rapidly. The main factor leading to the expansion of the water filled micro cracks in asphalt pavement is the overloading of vehicles, so the traffic management department should strictly limit the overloading of vehicles.%为了解带裂缝桥面铺装在内部动水压力作用下的力学响应情况，采用LS－DYNA有限元分析软件，建立沥青铺装层内部饱水裂缝模型，施加车辆正弦动态荷载，对内部动水行为进行流固耦合仿真模拟分析．结果表明：车辆动载作用下，饱水微裂缝所受最大压、剪应力均位于裂缝尖端，而最大拉应力则位于裂缝周围；饱水裂缝尖端最大压、剪应力与车速和荷载水平都有很好的线性相关性，在120 km／h速度、1．5 MPa荷载水平下， X、Y向最大压应力和最大剪应力分别达到0．472、1．101、0．361 MPa，在如此大应力反复作用下微裂缝将迅速扩展，加速铺装结构破坏．导致沥青铺装层内饱水微裂缝扩展、恶化的最主要因素是车辆的超载，交通管理部门应严格限制超载超限车辆的上路．
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