文档介绍：沙井泵站软基基坑变形监测
沙井泵站软基基坑变形监测
摘要:监测数据是判断基坑是否安全、是否需要采取紧急措施的重要依据。在基坑施工期间,由于土体卸载、内外侧不平衡土压力作用、基坑降水等均有会对周围建构筑及地表产生变形等影响。本文以沙井泵站软基基坑第三方变形监测为例,详细阐述了软基基坑变形监测方案设计、监测方案实施、监测数据分析。
关键词:变形监测;泵站软基基坑;
Deformation Monitoring of Shajin Pumping station Soft Foundation Pit
Cao MengchengChe Yonghe
(Shenzhen Water Planning and Design Institute, Shenzhen 518000, China)
Abstract: Monitoring data is an important basis for estimating whether a foundation pit is secure or needs taking emergency excavation of a foundation pit, earth unloading, unbalanced earth pressure and foundation pit dewatering would lead to deformation of the structures and surface article takes the project of third party deformation monitoring of soft foundation pit in Shajin pumping station for author gives particular presentation on the content of scheme designing, implementation and data analysis on deformation monitoring of soft foundation pit.
keywords:deformation monitoring; Pumping station Soft Foundation Pit
中图分类号: 文献标识码:A 文章编号:
引言
国家发改委等《关于加强重大工程安全质量保障措施的通知》文要求:建设单位应委托独立的第三方监测单位,对工程进展和周边地质变形情况等进行监测、分析,并及时采取防范措施。在施工单位自测的基础上进行第三方监测,对施工单位监测的内容进行检核和比较,可确保主要监控量测数据准确可靠,从而保证安全施工。
1 工程概况
沙井泵站基坑位于沙井河与茅洲河交汇处,离河岸距离最近不足10米。基坑支护设计范围为前池渐变段至出口消力池,平面尺寸L×B=220米×68米,~17米。基坑范围为河道及海陆相堆积、冲击平原地貌。~,填土层以下为淤泥、粉质粘土、沙砾为主的海陆交互相堆积层,厚度约为16米。场地地