摘要
以福建省厦门市某下穿快速公交系统桥的隧道基坑工程为背景,基于现场实测数据,结合开挖过程中基坑变形特性,分析深基坑开挖对基坑内外桥台基础的变形影响.结果表明:坑外20#桥墩受浅层与深层土体共同作用影响,竖向变形呈现先沉降再隆起的趋势,水平变形以朝向基坑内侧的侧向变形为主,受坑外回填土不密实影响,距基坑较远的17#桥墩的侧向变形大于较近的20#桥墩;坑内逐渐裸露的桥墩和承台的竖向变形规律一致,坑内18#桥墩最大隆起为4.34 mm,19#桥墩最大隆起为4.24 mm,水平变形以顺桥向的变形为主,垂直基坑方向的水平位移逐渐增大,平行基坑方向的水平位移则波动变化.
Taking the tunnel foundation pit engineering of a underpass bus rapid transit system bridge in Xiamen City,Fujian Province as the background,based on field measured data and combined with the deformation characteristics of the foundation pit during the excavation process,the influence of deep foundation pit excavation on the deformation of the abutment foundation inside and outside the foundation pit is analyzed.The results show that the 20#pier outside the pit is affected by the combined action of shallow and deep soil,and the vertical deformation first settles and then uplifts;the horizontal deformation is mainly lateral deformation towards the inner side of the foundation pit;and the lateral deformation of the 17#pier far from the foundation pit is greater than that of the 20#pier near the foundation pit due to the uncompacted backfill outside the pit.The vertical deformation pattern of the gradually exposed pier is consistent with the pattern of bearing platform in the pit,the maximum uplift of 18#pier in the pit is 4.34 mm,and the maximum uplift of 19#pier is 4.24 mm,the horizontal deformation is mainly along the bridge direction,and the horizontal displacement perpendicular to direction of foundation pit gradually increases,while the horizontal displacement parallel to direction of foundation pit fluctuates.
作者
濮黎明
肖朝昀
朱浩杰
黄山景
PU Liming;XIAO Zhaoyun;ZHU Haojie;HUANG Shanjing(College of Civil Engineering,Huaqiao University,Xiamen 361021,China)
出处
《华侨大学学报（自然科学版）》
CAS
2023年第5期582-590,共9页
Journal of Huaqiao University(Natural Science)
基金
国家自然科学基金资助项目(51778249)
华侨大学研究生科研创新能力培育计划项目(18013086015)。
关键词
基坑工程
下穿桥梁
现场监测
桥台变形
foundation pit engineering
underpass bridge
field monitoring
abutment deformation
