广州海心沙地铁站坑中坑支护技术

Support Technology of Pit in Foundation Pit of Haixinsha Metro in Guangzhou

结合海心沙地铁站建设工程实例,介绍了大型坑中坑围护结构及支撑设计。详细介绍了坑中坑支护技术的施工要点。基坑实施信息化施工,通过对基坑围护结构的深层位移及内力进行监测分析,密切关注基坑的变形趋势,保证了基坑施工安全,并结合桩体位移和轴力变化,对开挖过程中内坑与外坑的相互影响及该支护方案的经济性进行了分析。

Based on Haixinsha Metro Station construction,the design of enclosure structure and support are introduced.The key construction points of pit in foundation pit are introduced in detail and informational construction method is adopted.Based on the monitoring analysis on deep-seated displacement and inspecting of internal force of foundation enclosure structure,the distortion trend is noticed to ensure construction safe.Combined with displacement of piles and change of shaft force,the authors analyze influence and economic rationality of the scheme.