摘要
脱空区滞留水在车辆荷载作用下形成的动水压力,是造成水泥混凝土路面破坏较为严重的主要原因之一。为分析脱空区滞留水产生动水压力的分布特性,建立含脱空区水泥混凝土路面-滞留水双向流固耦合计算模型,并对车辆行车位置、行车速度、轴载、脱空区面积等因素对动水压力的影响进行分析。结果表明,脱空区内形成的动水压力是由车辆荷载特征和脱空区几何形态等多因素综合决定的。动水压力沿着出口方向呈三次方减小关系,其最大值发生在内部尖端处。当车轮作用在路面板边缘时,动水压力值最大,此时对路面的破坏最严重。车辆行驶速度、轴载、脱空区面积是影响动水压力的3个重要因素,动水压力大小与行驶速度呈二次方增加关系,与轴载呈线性增加关系,与脱空区面积呈三次多项式增加关系。采取交通管制措施,降低车辆行驶速度和轴载,并及时采取灌浆或注浆等修补措施,可有效减缓动水压力引起的路面结构破坏。
Hydrodynamic pressure is one of the main reasons for the water damage of cement concrete pavement, which is caused by the stagnant water in void under the vehicle load. In order to analyze the distribution characteristics of hydrodynamic pressure, the fluid-structure interaction calculation model including the cement concrete pavement and stagnant water is established, and the influence of vehicle location, vehicle speed, axle load and area of void on the hydrodynamic pressure are analyzed. The results show that, the hydrodynamic pressure formed in the void is determined by many factors such as the vehicle load characteristics and the geometric shape of the void. The distribution of hydrodynamic pressure along the exit direction is cubic polynomial and the maximum value occurs at the inner tip of void. When the wheel is on the edge of the pavement, the value of hydrodynamic pressure is maximum. Vehicle speed, axle load and void area are three important factors affecting the hydrodynamic pressure, the hydrodynamic pressure is in square relations to the vehicle speed, proportional related to the axle load, and cubic polynomial to the area of the void. Taking traffic control measures to reduce vehicle speed and axle load, and taking timely measures such as grouting can effectively reduce the damage caused by the hydrodynamic pressure on the pavement structure.
出处
《公路》
北大核心
2018年第1期20-25,共6页
Highway
基金
国家自然科学基金,项目编号51278431
