服务区透水混凝土道面结构力学行为研究

Study on Mechanical Behavior of Permeable Concrete Pavement Structure in Service Area

摘要:

为提升服务区形象和服务水平，排水式路面是一种较有效的解决方案。由于当前高速公路服务区道面结构设计缺乏明确的设计标准，针对服务区不同服务对象，调研并计算了不同典型荷载面积与压力值，构建了三维有限元模型，对不同典型荷载做了多种工况的布置，最后开展了不同透水混凝土结构组合方案下的结构力学行为研究。结果表明：对于带施工缝的水泥混凝土板，荷载作用于板角位置时层底应力最大，板中位置次之，板边位置最小；不同典型荷载下的混凝土层底拉应力差异较大，重车荷载下的层底应力是行人荷载工况的45~87倍，是小车荷载工况的9~11倍；透水混凝土结构面层厚度的增加可以有效减少面层层底应力，当透水混凝土层厚度到达0.13 m之后，面层层底拉应力的变化趋势明显变缓；考虑到透水混凝土结构的耐久性和排水效果，建议采用透水混凝土厚度为0.13 m的设计方案。

Abstract:

In order to improve the image and service level of service areas， the pavement has become a more effective solution. Due to the lack of clear design standards for pavement structure in the expressway service area at present， aiming at the different service objects in the service area， the different typical load areas and pressure values are investigated and calculated. The three-dimensional finite element model is established. A variety of conditions are arranged for different typical loads. Finally， the structural mechanical behavior of different permeable concrete structures is studied. The results show that for the cement concrete slab with construction joint， when the load acts on the corner position of the slab，the bottom stress is the largest， followed by the middle position of the slab， and the edge position of the slab is the smallest. The tensile stress at the bottom of concrete layer under different typical loads is quite different. The stress at the bottom of concrete layer under heavy load is 45~87 times that of pedestrian load and 9~11 times that of trolley load.The increase of surface thickness of permeable concrete structure can effectively reduce the bottom stress of surface layer. After the thickness of permeable concrete layer reaches 0.13 m， the variation trend of tensile stress at the bottom of surface layer becomes slower obviously. Considering the durability and drainage effect of permeable concrete structure， it is recommended to adopt the design scheme of 0.13 m-thick permeable concrete slab.