分体井筒式地连墙锚碇基础承载性能研究  

Bearing Performance of Split Shaft Diaphragm Wall Anchor Foundation of Bridge

作　　者：崔立川[1] 罗林阁 易绍平[1] 付佰勇[1,3] 过超 CUI Li-chuan;LUO Lin-ge;YI Shao-ping;FU Bai-yong;GUO Chao(CCCC Highway Consultants Co. Ltd. , Beijing 100088, hina;Guangdong Nanyue Transportation Investment ＆ Construction Co. Ltd. ,Guangzhou 510101, China;National Long-span Bridge Construction Research Center, Beijing 100088, China)

机构地区：[1]中交公路规划设计院有限公司,北京市100088 [2]广东省南粤交通清云高速公路管理中心,广州市510101 [3]中交公路长大桥建设国家工程研究中心有限公司,北京市100088

出　　处：《公路》2018年第6期78-84,共7页Highway

摘　　要：在借鉴国内外现有井筒式地连墙工程实践的基础上,结合清远西江特大桥的建设条件特点,提出了一种新型的分体井筒式地连墙锚碇基础结构形式。分体井筒式地连墙锚碇基础采用在顺桥向前后分体设置（净距12.3m）的矩形井筒地下连续墙基础,单个井筒平面尺寸为42m（横桥向）×18.6m（顺桥向）,内外墙厚度均为1.2m,通过内部横纵隔墙分成8个隔舱,嵌入中风化岩层深度不小于3m。分析表明,前、后锚地连墙分担的竖向荷载比例为52%、48%,且以地连墙嵌岩段端阻力承担竖向荷载为主,外墙和土芯提供的竖向侧阻很小。前、后锚地连墙分担的主缆水平向分力分别为49.8%和50.2%,两者基本相等,均以土芯土抗力及外墙侧向土抗力分担为主。通过井筒式的构造及地连墙嵌入中风化岩层,能有效发挥井筒内土芯的抗水平力作用。提出了一种带结合钢板的榫槽式钢筋笼搭接锚固刚性接头,保证槽段间的刚性连接。相关成果可为悬索桥地连墙锚碇基础设计及研究人员提供参考。Based on the existing engineering practice of bridge diaphragm wall at home and abroad and construction conditions of Xijiang Bridge in Qingyuan,a new type of bridge anchor foundation with split diaphragm wall is proposed.The split diaphragm wall is formed by two rectangular shaft diaphragm wall foundations which are installed front and back（clear distance 12 m）along the bridge.The plane dimension of a single diaphragm wall foundation is 42 m（transverse to the bridge）×18.6 m（along the bridge）,which is divided into 8 compartments with wall thickness of 1.2 m.The depth of the embedded medium weathered rock is not less than 3 m.The analysis shows that the vertical load ratio between the front and back anchorage walls is 52%and 48%,mainly carried by end resistance of rock socketed section and rarely carried by lateral friction of outer and inner side wall.The lateral load ratio between the front and back anchorage walls is 49.8% and 50.2% respectively,mainly carried by lateral resistance of inner and outer wall in the rock section.The diaphragm wall shaft structure and embedded into the weathered rock can effectively exert the horizontal resistance of the soil core in the shaft.A rigid spliced joint with a steel plate cage with a steel plate is put forward to ensure the rigid connection between the segments.The related results can be used as reference for the design and researchers of the continuous wall anchor foundation of the suspension bridge.

关 键 词：锚碇基础 分体 井筒式地连墙 刚性接头 承载性能 研究 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]