摘要
为得到气候因素影响下内置式加筋土桥台服役性能的演变规律,本文在安徽省某高速公路开展了现场试验。首先,通过多要素、多截面的现场监测,得到桥台变形、土压力以及温度场分布;其次,基于长期监测结果,揭示温度与降雨作用下桥台内部温度场分布特征、桥台内部受力与变形规律;最后,通过多因素分析以及与传统加筋土挡墙的对比,研究内置桩体的作用机理。研究结果表明:桥台内部温度分布形式和变化规律与气温周期性变化密切相关,但桥台内部温度变化具有滞后性,且桥台内温度分布受临空面和内置桩的影响;桥台面板侧向位移增长速率随温度升高及季节性降雨而显著增大,侧向位移沿墙高呈现“中间大,顶、底部小”的特点,但在内置桩体影响范围内面板中间位移与顶、底部位移差异显著降低;面板背部水平土压力与面板侧向变形相协调,在内置桩的侧向挡土作用下会产生水平土拱,墙背中上部水平土压力会逐渐向桩背转移;内置式加筋土桥台可以在一定程度上缓解桥头跳车的现象。气候以及内置桩体会影响桥台内部变形与受力,设计时应关注内置式加筋土桥台在服役期间的土压力分布特征,施工中应采取相应的防排水措施。
To investigate the influence of climate factors on the in-service performance of embedded geosynthetic-reinforced soil abutments,a field experiment was conducted in Anhui Province.Firstly,multi-element and multi-section monitoring devices were utilized to obtain abutment deformation,earth pressure,and temperature field distribution.Secondly,based on long-term monitoring data,the characteristics of internal temperature field distribution and the mechanisms of stress-deformation evolution under temperature-rainfall coupling effects were revealed.Finally,through multivariate analysis and comparative studies with conventional geosynthetic-reinforced soil retaining walls,the mechanism of embedded piles was clarified to provide theoretical basis for engineering design.The results show that the internal temperature distribution pattern correlates closely with periodic ambient temperature variations,and yet exhibits thermal hysteresis.Temperature distribution is influenced by free surfaces and embedded piles.Lateral displacement of the abutment facing significantly increases with rising temperatures and seasonal rainfall.Moreover,lateral displacement at the middle-height of the facing is significantly greater than that at the top and the bottom of the facing.However,displacement differences between middle and extreme positions decrease significantly within pile-reinforced zones due to the lateral confinement provided by the embedded piles.As the lateral deformation of the facing progresses,lateral earth pressure behind the facing is redistributed due to pile-induced stress arching and gradually shifts towards the pile backs.The embedded geosynthetic-reinforced soil abutment demonstrates superior differential settlement control capability,therefore effectively mitigating the"bump at the end of the bridge"phenomenon.Climate effects and embedded piles significantly influence the in-service performance of embedded geosynthetic-reinforced soil abutments.Special emphasis is therefore placed on monitoring pressure distribution evolution,coupled with the implementation of waterproofing and drainage measures during design and construction.
作者
左彬澧
徐超
孟亚
胥昕怡
李昊煜
ZUO Binli;XU Chao;MENG Ya;XU Xinyi;LI Haoyu(Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China;Anhui Transport Consulting&Design Institute Co.Ltd.,Hefei 230088,China)
出处
《中南大学学报(自然科学版)》
北大核心
2025年第5期1911-1922,共12页
Journal of Central South University:Science and Technology
基金
安徽省交通运输重点科技项目(2021-KJQD-016)。
关键词
道路工程
服役性能
现场监测
内置式加筋土桥台
温度
降雨
road engineering
in-service performance
field monitoring
embedded geosynthetic-reinforced soil abutment
temperature
rainfall
