(1 北京大学医学部基建工程处, 北京 100191; 2 建筑安全与环境国家重点实验室, 北京 100013;3 中国建筑科学研究院有限公司地基基础研究所, 北京 100013; 4 北京市地基基础与地下空间开发利用工程技术研究中心, 北京 100013; 5 中国建筑技术集团有限公司, 北京 100013)

摘要: 以邻近深基坑的既有建筑物加固改造为背景,分析了基坑开挖与邻近建筑物的相互影响,基坑的开挖造成建筑物倾斜或者开裂,邻近建筑物所施加的超载使基坑变形增大. 对邻近建筑物采取隔断体保护、结构加固、地基基础加固措施;对基坑采取针对性的设计与施工:护坡桩+锚索+止水帷幕;建立施工过程监测预警系统. 监测结果表明,桩顶水平、竖向位移累计最大值分别为 13、7. 38mm,小于控制值 24mm;保留建筑物基础的最大沉降为18. 1mm,基础倾斜 0. 44‰,远小于允许值 3‰的规定;表明保留建筑物加固、基坑降水与支护的设计和施工是成功的.

关键词: 邻近建筑物; 基坑; 相互作用; 监测预警系统; 加固; 沉降

中图分类号:TU318. 1 文献标志码:A 文章编号:1002-848X(2023)12-0144-06

DOI:10. 19701 / j. jzjg. 20222663

Interaction between foundation pit excavation and adjacent buildings and reinforcement measures

YAO Xi1, XIA Changhua2,3,4, JIANG Ning2,3,4, LI Dezhi5, DING Baohua5

(1 Infrastructure Construction Department of Peking University Health Science Center, Beijing 100191, China;2 State Key Laboratory of Building Safety and Built Environment, Beijing 100013, China; 3 China Academy of BuildingResearch Foundation Institute, Beijing 100013, China; 4 Beijing Engineering Technology Research Center of Foundationand City Underground Space Development and Utilization, Beijing 100013, China; 5 China Building Technique GroupCo. , Ltd. , Beijing 100013, China)

Abstract:Based on the reinforcement and reconstruction of the existing building adjacent to the deep foundation pit, theinteraction between the excavation of the foundation pit and the adjacent building was analyzed, the excavation of thefoundation pit causes the building to tilt or crack, and the overload imposed by the adjacent building causes the deformationof the foundation pit to increase. The partition protection, structural reinforcement, foundation reinforcement measures wereadopted for adjacent buildings. The targeted design and construction of the foundation pit was adopted: slope protectionpile + anchor cable + water stop curtain. The construction process monitoring and early warning system was established.The monitoring results show that the maximum cumulative horizontal and vertical displacement of pile top are 13mm and7. 38mm respectively, which is less than the control value of 24mm. The maximum settlement of the reserved buildingfoundation is 18. 1mm and the foundation tilt is 0. 44‰, which is far less than the allowable value of 3‰. It shows that thedesign and construction of retaining building reinforcement, foundation pit dewatering and supporting are successful.

Keywords:adjacent building; foundation pit; interaction; monitoring and early warning system; reinforcement; settlement

第一作者:姚希,硕士,工程师,主要从事工程管理工作,Email:173562997@ qq. com.

[引用本文] 姚希,夏长华,江宁,等. 深基坑开挖与邻近建筑物的相互影响及加固措施[ J]. 建筑结构,2023,53(12):144-149. YAO Xi,XIA Changhua,JIANG Ning,et al. Interaction between foundation pit excavation and adjacentbuildings and reinforcement measures[J]. Building Structure,2023,53(12):144-149.