北方深厚湿陷性黄土场地地基处理

Found ation treatment of deep collapsible loesssite in North China

针对传统北方深厚湿陷性黄土场地地基处理方法成本高,施工周期长的问题,提出素土挤密桩与CFG桩复合地基处理方法进行湿陷性黄土场地地基处理。以张家口桥东区某小区地基处理工程为主要研究对象,对素土挤密桩与CFG桩复合地基处理方法进行深入研究。通过室内土工试验、现场原位测试对黄土单个物理指标与湿陷性关系进行分析。最后对7^(#)地基部分桩基问题采取增加短桩进行补救,补救结果地基满足设计要求。

In view of the high cost and long construction period of the traditional foundation treatment method for deep collapsible loess site in northern China,the composite foundation treatment method of plain soil compaction pile and CFG pile is proposed for the foundation treatment of collapsible loess site.Taking the foundation treatment project of a residential area in Qiaodong District of Zhangjiakou as the main research object,the treatment method of plain soil compaction pile and CFG pile composite foundation is deeply studied.The relationship between single physical index and collapsibility of loess is analyzed through indoor geotechnical test and in-situ test.Finally,the problem of pile foundation in 7^(#) foundation is remedied by adding short piles.The remedial results show that the foundation treatment method proposed in this study can effectively remedy the problem foundation,and the foundation after remedy can meet the design requirements.