车辆荷载和静荷载对路肩式挡墙影响的研究

Comparative research on the rffect of vehicle load and static load on road shoulder type retaining wall

按JTGD30-2004《公路路基设计规范》规定,车辆荷载作用在挡土墙背土上所引起的附加土体侧压力可以换算成等代均布土层厚度后,按库伦土压力理论计算,并且抗倾覆系数取值1.5。研究车辆行车荷载对挡土墙的影响,对原有的设计理论进行分析完善,既能够优化结构又能提高经济效益。为研究在车辆荷载的作用下挡土墙的受力特点及影响,设计了试验模型;通过试验测出挡土墙在不同的轴载作用下应力的分布图以及计算出总合力、合力矩,并且与静荷载作用下挡墙的受力状态进行对比,据此提出了减小土压力、改进挡土墙的措施。

According to JTGD30-2004《Specifications for Design of Highway Subgrades》,pressure caused by vehicles load impaction on the backface of the abamurus can be convert to equivalent even soil,then calculate it according to rankine＇s soil pressure theory,factor of safety against overturning is 1.5.It can both optimize the structure and improve economic performance to study the vehicle load effect on retaining walls and analyze and improve the existing design theory.In order to research retaining wall＇s mechanical characteristics and influence under the action of vehicle load,we design the experimental model;trough the experiment,we measured retaining wall＇s load stress distribution and calculated the total force and moment in different axis,and compared with the static load.Then put forward the way to reduce soil pressure and improve the retaining wall.