深基坑变形控制指标研究  

Deformation Control Criteria of Deep Excavations

作　　者：徐中华[1] 王卫东[1] 

机构地区：[1]华东建筑设计研究院有限公司地基基础与地下工程设计研究所,上海200002

出　　处：《地下空间与工程学报》2010年第3期619-626,共8页Chinese Journal of Underground Space and Engineering

基　　金：上海市科委科技攻关重点项目(08201200901)

摘　　要：对于环境条件复杂的基坑工程,其设计已由传统的强度控制转变为变形控制,变形控制的关键之一是确定合理的变形控制指标。文章提出了根据基坑周围环境对附加变形的承受能力和根据大量基坑工程统计资料确定深基坑变形控制指标的两种方法。在介绍了基坑周围建筑物对附加变形的承载能力的基础上,提出了据之确定基坑工程变形控制指标的方法和流程。然后在提出了基坑环境保护等级概念的基础上,将基坑环境保护等级分为三级,根据上海地区大量基坑工程的统计资料,确定了各环境保护等级基坑的变形设计控制指标。For deep excavations with complex environment,the concept of performance-based design rather than capacity-based design should be adopted.One of the key problems in a performance-based design is to determinate deformation control criteria.Two methods are proposed to determine the deformation control criteria of deep excavations.The first method is based on the bearing capacity of additional deformation of the surrounding environment and the second method is based on the deformation behavior of a large number of deep excavation histories in Shanghai.After introducing the bearing capacity of additional deformation of buildings,the procedure of determining the deformation control criteria of deep excavations of the first method is proposed.Then the concept of environment protection grade is introduced and the environment condition of deep excavations is classified into three grades.A deformation control criterion of each grade is proposed according to a large number of case histories in Shanghai district.This deformation control criterion can be used as a guide for the design of deep excavations.

关 键 词：深基坑 变形控制指标 附加变形 围护结构最大侧移 地表最大沉降 

分 类 号：TU476[建筑科学—结构工程]