富水地层高层建筑基坑支护方案与防水研究

Study on Supporting Scheme and Waterproofing for Foundation Pit of High-rise Building in Water-enriched Stratum

合理的支护方案和防水膜参数一直是富水地层高层建筑基坑修建中的两个关键问题。以无锡市银河大厦基础工程试验为依托,建立了水压-土压连成作用的"荷载-结构"三维有限元模型,对比了单一方向钢管支撑基坑和十字型钢管支撑基坑这2种不同支护方案的变形特性、力学响应。根据所在地层富水条件,通过防水膜水压性能试验,确定较佳的防水膜厚度为3.5 mm。

Reasonable supporting scheme and parameter of waterproofing membrane have been crucial issues during construction of foundation pit for high-rise building. By taking Yinhe Mansion in Wuxi City as the background, three dimensional finite element mode/ was established based on the interaction of soil pressure and water pressure. Numerical simulation was carried out to compare deformation characteristics and mechanic response for two different supporting schemes such as single orientation of steel tube and crossing of steel tube. Moreover, according to local hydrological geology and hydraulic testing of waterproofing membrane, the reasonable thickness of waterproofing membrane is about 3.5 mm.