深基坑岩土结构化永久支护理论与设计方法
Theory and design method of permanent support for deep foundation pit using structural method of geotechnique
李连祥 1李胜群 2邢宏侠 2侯颖雪 2韩志霄2
作者信息
- 1. 山东大学土建与水利学院,济南 250061;山东大学基坑与深基础工程技术研究中心,济南 250061;山东高新岩土工程有限公司,济南 250102
- 2. 山东大学土建与水利学院,济南 250061;山东大学基坑与深基础工程技术研究中心,济南 250061
- 折叠
摘要
基于对项目地下系统设计现状的深入剖析,指出岩土与结构专业分离造成基坑临时支护资源浪费、环境污染、碳排放增加等弊病,提出深基坑岩土结构化永久支护体系理论与设计方法.阐明了永久支护体系构件组成与构造过程,给出了永久支护体系承载能力极限状态和正常使用极限状态设计原则;明确了基坑开挖、构建和正常使用三个阶段的荷载组合和计算内容,建议了深、较深基坑划分界限及其永久支护结构分别适用的有限元法和弹性支点法;强调应进行支护构件的耐久性分析,证明了岩土结构化深基坑永久支护结构地下室外墙基本不承担土压力,改变了目前开挖阶段支护结构、使用阶段地下室外墙分别承担土压力即两倍建筑材料抵挡土压力的现状,显示了深基坑永久支护结构的工程价值及其推广的意义.
Abstract
Based on the in-depth analysis of the current design status of the underground system of the project,the disadvantages such as wasting of temporary support resources,environmental pollution and carbon emission increase caused by the separation of geotechnical and structural specialties in the foundation pit was pointed out,and the theory and design method of the geotechnical structural permanent support system of deep foundation pit was put forward.The composition and construction process of the permanent support system were explained,and the design principle of the limit state of the permanent support system's bearing capacity and normal use limit state was given.The load combination and calculation contents of three stages of excavation,construction and normal use of foundation pit were clearly defined,and the finite element method and elastic fulcrum method applicable to the division limits of deep and deep foundation pits and their permanent supporting structures were suggested respectively.It is emphasized that durability analysis of support components should be carried out,and it is proved that the basement exterior wall of permanent support structure of geotechnical structural deep foundation pit is basically free from earth pressure,which changes the current situation that the support structure in the excavation stage and the basement exterior wall in the use stage bear soil pressure respectively,that is,twice the building materials resist soil pressure,and shows the engineering value of the permanent support structure in deep foundation pit and its popularization significance.
关键词
深基坑/岩土结构化/永久支护结构/耐久性Key words
deep foundation pit/structural method of geotechnique/permanent support structure/durability引用本文复制引用
基金项目
国家自然科学基金项目(52179106)
山东省自然科学基金计划(ZR2018QEE008)
济南市科技计划项目(201201145)
出版年
2024
NETL
NSTL
万方数据