摘要
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。
In this engineering design, the base pressure is 650 kPa, CFG pile composite foundation treatment technology is applied. According to the characteristics of stratum combination below the bottom of foundation, there are three possible bearing layers at pile end with different depth and different lithology, through carefully comparison and selection, the cohesive soil layers with plastic and low compressive are chosen as the pile end of this project. Through the pile inspection, both the characteristic value of single pile bearing capacity and the characteristic value of hearing capacity of single pike composite foundation can meet the design requirements. In addition, according to observation of settlement results in 310 days after the main structure capping, the maximum settlement value （the 3# building 25.96mm, the 4＂ building 29.83mm）is much smaller than 70ram the final settlement value of the structure design requirement, and becomes stable. Therefore, it is concluded that the choice of pile end bearing layer and the final settlement control are feasible in the foundation treatment design of the project.
出处
《建筑科学》
CSCD
北大核心
2015年第11期98-102,共5页
Building Science
关键词
CFG桩复合地基
特大基底压力
桩端持力层选择
最终变形值
CFG pile composite foundation
extra large foundation pressure
selection of pile end bearing layer
final settlement
