含盐冻土地区碎石桩地基处理技术探讨

Treatment Technology of Gravel Pile Embankment in Saline Permafrost Regions

在西北寒冷地区基础的设计施工中,经常会遇到季节性冻土问题,在某些地区冻土还包含有盐渍土。本文针对季节性冻土产生的冻涨、融陷及盐渍土的盐溶、盐胀等问题,结合某工程试验段,对西北地区某货运铁路地基采用碎石桩处理技术进行了探讨。通过有限元数值模拟分析,将天然地基和处理后地基的沉降曲线进行对比,发现经碎石桩处理后,地基沉降有了明显改善,符合铁路运行规范的要求。

We often encounter the problem of seasonal frozen soil in the base design and construction in northwest regions,especially saline soil in some regions.To solve the problems of frost heaving,thaw collapse,salt dissolution,salt expansion resulted from seasonally frozen soil,this paper discusses the gravel piles treatment in one freight railway embankment in northwestern area.Through the finite element numerical simulation analysis,the settlement curves of natural embankment and treated embankment are compared,it is found that after the treatment of gravel piles,the embankment settlement is improved,which meets the running requirements of railway.