一种新型拱形底面的水泥混凝土路面结构  

New pavement structure of cement concrete slab with arched bottom

作　　者：张擎[1] 彭华[2] 张洁[1] 曹慎敏 

机构地区：[1]长安大学公路学院,陕西西安710064 [2]中国中铁二院工程集团有限责任公司,四川成都610000

出　　处：《长安大学学报（自然科学版）》2016年第6期1-9,共9页Journal of Chang’an University(Natural Science Edition)

基　　金：中央高校基本科研业费专项资金项目(CHD2011JC087);陕西省交通运输厅科研项目(14-09K)

摘　　要：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 structure of continuously arched bottom concrete pavement（CABCP）was put forward,which features by small-span continuously arch in bottom and plane in surface.Fully exerting advantage that the compressive strength of concrete was much larger than tensile strength,the arch structure transfered the load through arch axis compressed under the vehicle load,which made much of the pavement be in the compression situation,and could reduce the magnitude and the area of tensile stress largely,so it could greatly improve the carrying capacity and durability of the pavement.ABAQUS numerical simulation of cement concrete pavement with arched bottom was established,and effects of vehicle load,parameters of slab arch and steel bar anchoring in arch foot on working condition of pavement structure were also analyzed.The results show that different from traditional pavement,after the road arch ring being adopted,the slab bears compression stress in most part of the pavement construction.The tensile region isnarrowed,which is mainly concentrated in the central of the arch slab underside,and the slab tensile stress level is far lower than that of the traditional pavement.The arched bottom greatly improve the working condition of pavement.By controlling parameters like arch ring rise-span ratio,span,thickness of slab,the road load stress reduces.It is very obvious that arch ring structure can reduce the damage caused by overloading and super overloading.Appropriate arch ring rise-span ratio arched slab thickness and arch height are recommended.The reducing pavement load stress and arch foot horizontal displacement can be achieved through increasing the steel bar diameter and decreasing the bar spacing.The stress in concrete around anchored reinforcement is relatively low,generally less than 2.0 MPa.

关 键 词：道路工程 拱形底面水泥路面 数值模拟 荷载拉应力 钢筋锚固 

分 类 号：U416.216[交通运输工程—道路与铁道工程]