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本工程设计基底压力650k Pa,采用CFG桩复合地基处理技术。根据基底以下地层组合特点,存在3个不同深度及不同岩性的可能桩端持力层,经过对其进行比选分析,最终选择了可塑中低压缩性的粘性土层作为本工程的桩端持力层。经桩检测,单桩承载力特征值、单桩复合地基承载力特征值均满足设计要求。另外,根据主体结构封顶后310d的沉降观测结果,最大变形值(3#楼25.96mm,4#楼29.83mm)仅远小于结构设计要求的最终变形值70mm,并趋于稳定。因此,初步认为本工程的地基处理设计在桩端持力层选择及最终变形量控制方面是可行的。
The project design base pressure 650k Pa, using CFG pile composite foundation treatment technology. According to the characteristics of the stratum below the basement, there are three probable pile supporting layers with different depths and different lithologies. After comparative analysis, the cohesive medium layer with plasticity and low compressibility is selected as the pile end of this project Holding layer. After pile test, the characteristic value of single pile bearing capacity and the characteristic value of bearing capacity of single pile composite foundation all meet the design requirements. In addition, the maximum deformation value (25.96mm in 3 # building and 29.83mm in 4 # building) is far less than the final deformation value of 70mm required by structural design and tends to be stable, according to the observation of 310 days after cap structure subsidence. Therefore, it is preliminarily believed that the foundation treatment design of the project is feasible in the selection of the bearing capacity of the pile head and the control of the final deformation.