邻接已建地下室深大基坑支护结构设计实践  

Design and practice of a deep foundation pit adjoined the built basement

作　　者：李书波 黄莹 章新 Li Shubo;Huang Ying;Zhang Xin(Mapping&Geotechnical Investigation,Co.Ltd.,Nanjing Institute of Surveying,Nanjing 210019,China)

机构地区：[1]南京市测绘勘察研究院股份有限公司,南京210019

出　　处：《工程勘察》2024年第2期14-20,30,共8页Geotechnical Investigation & Surveying

摘　　要：随着城市地下空间开发利用的迅猛发展,临近甚至邻接已建地下结构的项目也越来越多,如何利用已有地下结构或其支护结构成为面临的新课题。本文以某综合体项目基坑支护设计为例,阐述了项目特点及支护结构选型,并根据项目特点,针对与已建地下室及原围护结构间传力转换体系、支锚刚度引起的变形协调和地下水处理等关键问题提出了处理措施。工程实践表明,利用已有地下结构作为支撑点是可行的,但需要考虑支撑计算长度引起的支锚刚度变化,其可通过调整支撑杆件布置、加强截面参数及覆板边桁架等措施实现。With the rapid development of urban underground space,more and more projects are adjacent to the built basement.How to use the built structure and its retaining and protection structure has become a new topic.Taking the foundation pit retaining and protection structure design of a complex project as an example,the characteristics of the project and the selection of retaining and protection structure are expounded.According to the characteristics of the project,the treatment measures are proposed for the key problems such as the force transfer system to the built basement and the original retaining and protection structure,the deformation coordination caused by the anchor stiffness and the treatment of groundwater.The engineering practice shows that it is feasible to use the existing underground structure as the support point,but it is necessary to consider the change of anchor stiffness caused by the calculated support length,which can be realized by adjusting the layout of supporting rods,strengthening of section parameters and covering plate edge truss.

关 键 词：邻接已建地下室 深大基坑 传力转换体系 支锚刚度 地下水处理 

分 类 号：TU473[建筑科学—结构工程]