黄土地区大厚度回填土地基基础设计分析

Foundation Design and Analysis of Backfilling with Large Thickness in Loess Area

以实际工程为例,从勘察和设计两个方面,对黄土地区大厚度回填土地基基础设计进行分析,提出了大厚度回填土地基基础设计方法,研究成果可为相关的工程提供参考。研究结果表明:1)随着时间增长,大厚度回填土地基沉降量逐渐减小,最后趋于稳定,因此,回填土地基施工前应放置一段时间,沉降稳定后方可施工;2)大厚度回填土地基施工前可采用强夯等方法对地基土进行处理,减小回填土地基不均匀变形;3)大厚度回填土地基基础设计时,宜采用刚度较大的筏板或桩基础,同时上部结构亦应采用刚度较大的结构体系。

Taking actual engineering as an example, this paper analyzes two aspects of reconnaissance and design of loess area, and puts forward the super conventional design and design method of large thickness backfill soil foundation. The research results can provide reference for related projects. The results showed that： （1） with the increase of time, the settlement of backfill soil foundation with large thickness decreases gradually and finally tends to be stable, therefore, soil backfill construction should be placed before a period of time, such as backfill settlement stability before construction： （2） the large thickness of backfill construction land based methods can be used before compaction of soil pretreatment, which can reduce the uneven settlement of foundation backfill： （3） the large thickness of backfill soil foundation design, raft stiffness and pile foundation is better than that of strip foundation, and the upper structure should use the structure system with larger rigidity.