相邻深基坑开挖相互影响及变形控制研究  

Research on the Interaction and Deformation Control of the Adjacent Deep Foundation Pits Excavation

作　　者：陶连金[1] 胡国庆 焦伯阳 郭飞 赵旭[1] 张宇 Tao Lianjin;Hu Guoqing;Jiao Boyang;Guo Fei;Zhao Xu;Zhang Yu(The Key Laboratory of Urban Security and Disaster Engineering,Ministry of Education,Beijing University of Technology,Beijing 100124,China;Beijing Municipal Construction Co.,Ltd.,Beijing 100020,China;School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 102627,China)

机构地区：[1]北京工业大学城市与工程安全减灾省部共建教育部重点实验室,北京100124 [2]北京市政建设集团有限责任公司,北京100020 [3]北京建筑大学土木与交通工程学院,北京102627

出　　处：《市政技术》2024年第6期81-88,98,共9页Journal of Municipal Technology

基　　金：北京建筑大学青年教师科研能力提升计划(X23005)。

摘　　要：以北京城市副中心站综合交通枢纽项目大铁深基坑和02B区深基坑分期开挖为研究对象,采用有限元软件建立了局部精细化模型,对相邻深基坑开挖的变形特性和影响因素进行了研究,并提出了深基坑变形控制措施。研究结果表明,在相邻深基坑近接施工过程中,先开挖的深基坑呈向后开挖深基坑方向移动的趋势,而坑间土地表沉降变形从凹槽形变为双峰形;根据拟合出的变形曲线斜率,可以将相邻深基坑近接施工影响分区划分为:d<2h为强影响区,2h≤d<4h为次影响区,4h≤d<6h为弱影响区,d≥6h为无影响区;为了确保深基坑群施工的整体稳定性,最优开挖顺序是同步开挖,如需分步开挖应优先开挖支护结构刚度较大、支护力度较强的深基坑;该工程可通过及时在逆作区架设上斜撑来实现变形控制的目的。Taking the phased excavation of the Datie deep foundation pit and the 02B area deep foundation pit at the Beijing Municipal Administrative Center Station Comprehensive Transportation Hub as examples,a localized refined model is established through numerical simulation to study the deformation characteristics and influencing factors of adjacent deep foundation pit excavations.Measures for controlling the deformation are proposed.The research indicates that during the adjacent construction of deep foundation pits,the initially excavated pit tends to move towards the direction of subsequent excavation.The surface settlement deformation between the pits transitions change from a concave trough to a double peak pattern;Based on the different slopes of the fitted displacement curves,the impact zones can be classified as follows:the area with d<2h is the strong influence area,the one with 2h≤d<4h is the secondary influence area,the one with 4h≤d<6h is the weak influence area,and the one with d≥6h is noninfluence area;In order to ensure the overall stability of the construction of a cluster of deep foundation pits,the optimal excavation sequence is simultaneous excavation.If phased excavation is necessary,priority should be given to excavating pits with support structures of higher stiffness and stronger support force;The deformation control can be achieved by promptly installing inclined struts in the counter-working area.

关 键 词：相邻深基坑 同步开挖 相互影响 变形控制措施 

分 类 号：TV551.4[水利工程—水利水电工程]