广州地铁如意坊站富水砂层异形深基坑安全风险控制

Safety Risk Control for the Shaped Deep Foundation Pit in Water-rich Sand Layer at Guangzhou Metro Ruyifang Station

以广州市轨道交通11号线如意坊站基坑工程为依托,其最近距离珠江24.5 m,砂层厚度约17.0 m,地下水位高,基坑成异形状,采用明挖顺作法施工。通过对勘察阶段、设计阶段、施工阶段的安全风险进行分析,提出有效的控制措施,在施工过程中严格控制围护结构施工质量,细化基坑开挖顺序和开挖步骤,科学降水,快速施工结构等多种技术和管理措施,确保基坑施工和运营车站变形沉降安全可控,整个车站顺利完工。

Based on the foundation pit project of Ruyifang Station of Guangzhou Railway Transportation Line 11,which is 24.5 m away from the Pearl River at the closest distance,the thickness of the sand layer is about 17.0 m,the water table is high,the foundation pit is in anisotropic shape,and it is constructed by the open excavation and smooth working method.By analyzing the safety risks in the investigation stage,design stage and construction stage,putting forward effective control measures,strictly controlling the construction quality of the enclosure structure during the construction process,refining the sequence of pit excavation and excavation steps,scientific descending,rapid construction of the structure and other technical and managerial measures,it ensures that the deformation and settlement of the foundation pit construction and operation station are safe and controllable,and that the whole station is successfully completed.