摘要
随着城市轨道交通的快速发展,复杂环境下深基坑的建设对周围环境的影响日益突出,本文对某深基坑工程的支护方案进行了设计,提出了复杂水平支护形式和地墙的支护结构体系,明确了基坑监测目的和功能,设计监测系统的原则和监测的基本要求。以一个地铁站的复杂深基坑工程为例,通过数值模拟讨论了深基坑的两种分区开挖方法(分步开挖和同步开挖);分析了基坑周围土体的变形特征、各分区支护结构的侧向变形以及支护轴向力的分布;揭示了深基坑的变形规律;确定了安全经济的开挖方法。通过现场监测试验,揭示了地铁车站深基坑支撑结构的变形特征和应力演化行为。
With the rapid development of urban rail transit,the construction of deep foundation pit in complex environment has increasingly prominent influence on the surrounding environment.This paper designs the support scheme of a deep foundation pit project,puts forward the complex horizontal support form and the supporting structure system of the ground wall,clarifies the monitoring purpose and function of the foundation pit,and the principle of designing the monitoring system and the basic requirements of monitoring.Taking a complex deep foundation pit project of a subway station as an example,two excavation methods(step excavation and synchronous excavation)of deep foundation pit are discussed by numerical simulation.The deformation characteristics of the soil around the foundation pit,the lateral deformation of the supporting structure in each zone and the distribution of the supporting axial force are analyzed.The deformation law of deep foundation pit is revealed.A safe and economical excavation method is determined.The deformation characteristics and stress evolution behavior of deep foundation pit support structure of subway station are revealed through field monitoring test.
作者
贾永安
JIA Yongan(China Construction Materials Industrial Geology Reconnaissance Center Liaoning General Tea)
出处
《广东建材》
2024年第6期107-111,共5页
Guangdong Building Materials
关键词
复杂环境
深基坑
基坑设计
变形监测
有限元
Complex environment
Deep foundation pit
Foundation pit design
Deformation monitoring
Finite element
