岳阳洞庭湖大桥葫芦形锚碇基坑施工监测方案及受力特性研究  

Study of Monitoring Plan and Measured Mechanical Reaction of Excavation for Gourd-shaped Anchorage of Yue-yang Dong-ting-hu Bridge

作　　者：肖景平 贺炜[1] 崔剑锋[3] XIAO Jingping HE Wei CUI Jianfeng(Zhuhai Institute, of Urban Planning ＆ Design, Zhuhai, Guangdong 519000, China School of Civil Engineering and Architecture, Changsha University of Science and Technology, Changsha, Hunan 410114, China Hunan Provincial Communications Planning Survey ＆ Design Institute, Changsha, Hunan 410008, China)

机构地区：[1]长沙理工大学土木与建筑学院,湖南长沙410114 [2]珠海市规划设计研究院,广东珠海519000 [3]湖南省交通规划勘察设计院,湖南长沙410008

出　　处：《公路工程》2017年第1期71-75,共5页Highway Engineering

基　　金：交通运输部建设科技项目资助(2013318798320)

摘　　要：针对岳阳洞庭湖大桥锚碇葫芦形基坑的几何特点,合理布置监测点,并确定各监测项目的监测频率与预警值。结合现场监测数据,探讨了围护结构深层水平位移、墙体钢筋应力和墙顶变形等实测值的变化规律。分析表明:葫芦形地下连续墙单圆直径比圆形地连墙小,可较好发挥圆拱效应;中部的中隔墙提高了地连墙的局部刚度,减小了中部的位移量;葫芦形地下连续墙的侧向位移呈明显的"S"形变化。由实测结果分析可知,葫芦形地连墙整体设计方案合理,效果良好,内力与变形均可满足规范要求。Taking into account the geometrical feature of Yue-yang Dong-ting-hu Bridge Anchorage gourd-shaped pit, the monitor points were determined reasonably, as well as the frequency of monitoring and warning value. Based on the measured data, the variation of horizontal displacement, the stress of diaphragm wall, and deformation at the top were investigated. The conclusions could be drawn as fol- lows： The smaller diameter of gourd-shaped diaphragm wall than circular one is the reason why better dome effect exerts; the central wall between two circles increases the local stiffness and reduces the dis- placement; the measured distributed as ＂s＂ shape. lateral displacements of gourd-shaped diaphragm wall in this excavation were According to the analysis of measured date, gourd-shaped diaphragm wall is designed reasonably, which can also meet regulatory requirements of internal force and deformation.

关 键 词：葫芦形 锚碇基坑 变形特性 监测数据 

分 类 号：U446.1[建筑科学—桥梁与隧道工程]