基于小温差的连续配筋混凝土隧道路面早期开裂分析  

Research on Crack ofthe CRCP in the Tunnel under Low Temperature Difference

作　　者：刘建伟[1] 边丽[2] 申俊敏[1] 宋磊[1] 

机构地区：[1]山西省交通科学研究院黄土地区公路建设与养护技术交通行业重点实验室,太原市030006 [2]山西医科大学,太原市030001

出　　处：《公路》2013年第11期13-19,共7页Highway

基　　金：山西省交通建设科技项目;项目编号11-2-19

摘　　要：计算分析了温差对连续配筋混凝土路面配筋设计和开裂情况的影响,对路面早期温度和裂缝情况进行观测,得到了隧道内及路面温度变化情况和早期裂缝的发展规律。研究表明:隧道内温度变化缓慢,温差小。混凝土铺筑后的前4d,路面内部温度明显高于环境温度;79%的早期开裂出现在这一阶段;水泥水化使面板温度上升,在混凝土强度增长及干缩过程中应变增大、出现裂缝。前2d出现的裂缝数占前7d裂缝总数的50%,仅第2d出现的裂缝数就占裂缝总数的37.59%。裂缝宽度主要集中在0.1mm和0.2mm,占总裂缝数的60.5%;裂缝间距主要集中在2m^8m,占总裂缝数的76.8%。The paper calculates and analyzes the influence of temperature difference to design and cracking of continuously reinforced concrete pavement,and through observation to early pavement temperature and cracks development inside the tunnel,temperature changing condition inside of the tunnel and on pavements and developing regulation are obtained.Studies results show that the tunnel temperature changes slowly,and the temperature difference is small.In the first four days after concrete paving,the internal temperature of the road is significantly higher than the ambient temperature,79% of early cracking appears in this stages; Panel temperature rise because of the cement hydration.Strain increases in the process of growth of the concrete strength and shrinkage,the cracks appears.The number of cracks in the first two days accounts for 50% of the total number in 7 days,only the number of the second day accounts for 37.59%.Crack width accounts for 60.5% of the total,which is mainly concentrated in 0.1mm and 0.2 mm.The crack spacing is mainly concentrated in 2 m to 8 m,which accounts for 76.8% of all.The maximum crack spacing is 84 m,and the minimum is only 0.5 m.The design of continuously reinforced concrete pavement （CRCP） inside the long tunnel is not directly affected by temperature stress.

关 键 词：道路工程 温度场 连续配筋混凝土路面 裂缝 

分 类 号：U416.216[交通运输工程—道路与铁道工程]