巨厚砂层地质条件下的地铁车站基坑设计研究
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摘要
巨厚砂层地质条件具有渗透性强、卸载之后变形敏感的特点,为更好分析总结该地质条件下的基坑设计,结合无锡地铁3号线一期工程无锡新区站基坑围护结构设计以及施工现场基坑变形监测报警情况,梳理分析基坑变形监测报警的特点及原因,从钢围檩设置的必要性、钢支撑与围护结构连接节点可靠性、钢支撑水平布置、钢支撑竖向布置、坑外降水不同深度影响、坑内被动区土体加固等方面进行论证,采用单措施及多措施相结合的手段分别验证变形结果,确定的调整措施对后续基坑变形控制效果较理想,最终总结出该种地质条件下的地铁车站基坑围护结构设计规律、设计建议以及施工注意事项,为相似地质条件的设计提供参考。
The geological conditions of the thick sand layer are characterized by the high permeability and sensitive to the deformation after unloading.The excavation support design aspects of a metro station in thick sand stratum was summarized by presenting a case history of the supporting structure for the first phase Station for Metro Line#3 in Wuxi City.The deformations of the supporting structures were compared with the construction monitoring data.The necessity of the steel walers,reliability of the steel strut and connection joints,distribution of vertical and horizontal supports,dewatering depth outside of the excavation area and the passive earth pressure inside the excavation area are evaluated.As major control measuring,the deformation a the supporting structures were verified and the results were satisfactory.
The geological conditions of the thick sand layer are characterized by the high permeability and sensitive to the deformation after unloading.The excavation support design aspects of a metro station in thick sand stratum was summarized by presenting a case history of the supporting structure for the first phase Station for Metro Line#3 in Wuxi City.The deformations of the supporting structures were compared with the construction monitoring data.The necessity of the steel walers,reliability of the steel strut and connection joints,distribution of vertical and horizontal supports,dewatering depth outside of the excavation area and the passive earth pressure inside the excavation area are evaluated.As major control measuring,the deformation a the supporting structures were verified and the results were satisfactory.
引文
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