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提出一种连拱底面的水泥混凝土路面(continuously arched bottom concrete pavement,CABCP)新型结构,该路面结构的水泥混凝土板底部设计成小跨径的连续拱形形状,路面板上表面仍为平面。采用该结构的水泥混凝土路面通过拱形结构将车辆荷载应力沿拱轴线传递,使得拱形路面结构的大部分区域处于受压的工作状态,并极大地减小了路面混凝土受拉应力作用的范围及水平,充分发挥出水泥混凝土自身抗压强度远高于抗拉强度的优势,大幅提高了水泥路面的承载能力及耐久性能;建立了拱形底面水泥混凝土路面ABAQUS数值模型,分析了车辆荷载、板底拱圈参数及拱脚锚固对路面结构工作状态的影响。研究结果表明:拱形底面水泥混凝土路面的受荷状态不同于传统水泥路面,路面板大部分区域处于受压状态;拉应力大幅减小,远低于传统水泥路面的拉应力水平,且主要集中于拱圈底面中部,拱形板底结构使得路面板工作状况大为改善;控制拱圈矢跨比、跨径、拱厚等参数可降低路面拉应力,减少重载、超重载引起的路面开裂等病害;推荐了路面板底拱圈矢跨比、拱顶厚度、拱高等参数;拱脚植入竖向锚固钢筋大幅降低了路面板拉应力水平及拱脚水平位移,锚固钢筋周围混凝土应力水平较低,普遍低于2.0 MPa。
A new type of continuous arched bottom concrete pavement (CABCP) is proposed. The bottom of concrete pavement is designed as a continuous arch with a small cross-section. The upper surface of the pavement is still flat. The cement concrete pavement adopting the structure transmits the load stress of the vehicle along the arch axis through the arch structure so that most areas of the arch pavement structure are under the pressure working state and the scope of the tensile stress of the pavement concrete is greatly reduced And level, give full play to cement compressive strength of their own far higher than the tensile strength of the advantages of a substantial increase in the carrying capacity and durability of cement pavement; set up an arch bottom cement concrete pavement ABAQUS numerical model, the analysis of vehicle load, Effect of Parameters of Bottom Arch and Anchor of Arch and Foot on Working Status of Pavement Structure. The results show that: the loading condition of the arched bottom cement concrete pavement is different from that of the traditional cement pavement, most of the pavement slab is under compression; the tensile stress is greatly reduced, much lower than the tensile stress of the traditional cement pavement, In the middle part of the arch bottom, the working condition of the pavement slab is greatly improved by the arched plate bottom structure. Controlling the span-span ratio, span diameter and arch thickness of the arch ring can reduce the tensile stress of the pavement, reduce the pavement caused by heavy load and overweight load Cracking, cracking and other diseases. The parameters such as the span-to-span ratio, the thickness of the arch and the height of the arch were recommended. The vertical anchorage of the arch foot reduced the tensile stress level of the pavement slab and the horizontal displacement of the arch, Lower levels, generally below 2.0 MPa.