戈壁土地基的变形影响因素研究

Study on Influence Factors of Gobi Subsoil Deformation

针对兰新铁路第二双线新疆段戈壁区路基试验段工程,分析了含水率、颗粒组成、物质组成成分、含盐量4个因素对戈壁土地基的沉降影响。通过荷载-沉降曲线得出含水率对戈壁土变形的影响程度;通过分析戈壁土的颗粒组成,得出了平均粒径和不均匀系数对戈壁土地基变形的影响;采用X射线衍射法进行矿物分析得出了戈壁土的物质组成成分;通过对试验段样品易溶盐含量的分析,得出了该线盐渍土类型、含盐量随深度的分布规律和含盐量较大的戈壁土类型。试验成果为戈壁地区无砟轨道铁路路基的设计及工程实践提供了依据。

In this paper,the influences of four factors,such as water content,grain composition,material composition and salt content,on the subsidence of Gobi subsoil were analyzed for the subgrade test section engineering in Gobi district of Xinjiang section of Lanzhou-Xinjiang railway second double-line. The influence degree of the water content on Gobi desert soil deformation was obtained by the load-settlement curve. The influence of average particle size and non-uniformity coefficient on the deformation of Gobi subsoil was obtained by analyzing the grain composition of Gobi desert soil. The material composition of Gobi desert soil was obtained by X-ray diffraction method. The saline soil type,salt content distribution along depth and Gobi desert soil type with larger salt content were obtained by analyzing the dissolving salt content of samples in test section. The test results provide the basis for design and engineering practice of Gobi district ballastless track railway subgrade.