富水地区深基坑封底榫槽关键参数研究  

Key Parameters of Tenon and Groove on Back Cover of a Deep Foundation Pit in Water-Rich Areas in Shanghai,China

作　　者：张芳[1,2] 韩林芳 赵怡琳 桑运龙 刘学增[3,5] 高尚 杨研[1] ZHANG Fang;HAN Linfang;ZHAO Yilin;SANG Yunlong;LIU Xuezeng;GAO Shang;YANG Yan(School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;State Key Laboratory of Geomechanics&Deep Underground Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;Shanghai Tongyan Civil Engineering Technology Corp.,Ltd.,Shanghai 200092,China;Civil Engineering Information Technology Research Center,Ministry of Education,Tongji University,Shanghai 200092,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083 [2]中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室,北京100083 [3]上海同岩土木工程科技股份有限公司,上海200092 [4]同济大学土木信息技术教育部工程研究中心,上海200092 [5]同济大学土木工程学院,上海200092

出　　处：《隧道建设（中英文）》2022年第11期1913-1920,共8页Tunnel Construction

基　　金：中央高校基本科研业务费专项资金(2021YJSSB12)。

摘　　要：为解决富水地区高承压水环境条件下深基坑抗浮稳定性技术难题,提出在封底与地下连续墙之间设置榫接结构的新思路,采用理论分析的手段,研究榫槽几何参数及布置方式对承载性能的影响,得出几何参数设计原则及双榫的参数设计步骤。同时,利用上述方法对上海某富水地区基坑风井封底进行双榫设计,并通过数值模拟方法对榫槽设计的合理性进行验证。结果表明:1)榫槽底部长度、榫槽宽度、榫槽侧向接触面高度是影响榫槽抗剪承载力的关键几何参数,且各参数之间不是独立的,而是存在相互影响、相互制约的关系;2)当封底受力不均衡时,对称分布的双榫几何稳定性更高;3)深基坑数值模拟结果显示,在榫接结构作用下封底稳定且受力合理,验证了榫槽设计方法的合理性,为基坑抗浮提供了一种新方法。A new idea of setting a tenon joint structure between the back cover and the diaphragm wall is proposed to investigate the antifloating stability of deep foundation pit in a highly confined water environment in water-rich areas.Then,the influence of geometric parameters and the layout of the tenon and groove on bearing capacity is studied using theoretical analysis,and the design principles of geometric parameters and the design process of the double tenon are proposed.Meanwhile,the double tenon design for the back cover of the foundation pit in the water-rich area in Shanghai,China,is conducted using the abovementioned method.The rationality of the tenon and groove design is validated using numerical simulation.The results reveal the following:(1)The key geometric parameters that affect the tenon and groove′s ability to withstand shear are their bottom length,width,and height of the lateral contact surface.These parameters also work in conjunction with one another.(2)When the force on the back cover is unbalanced,the geometric stability of the symmetrically-distributed double tenon is higher.(3)The numerical simulation results of the deep foundation pit show that the back cover is stable and the force is reasonable under the action of the tenon and groove,which validates the rationality of the tenon and groove design method and provides a new method for the anti-floating of the foundation pit.

关 键 词：富水地区 深基坑 封底 榫槽 参数设计 

分 类 号：U45[建筑科学—桥梁与隧道工程]