铁路路基粗粒土填料压缩变形特性试验研究

在路基工程中，压实系数、含水率是两个重要影响因素。提高压实系数可改善水稳定性。控制压实系数和含水率是保证路基稳固的关键。结合兰新铁路第二双线建设所采用的粗粒土作为路基填料，做了大量的室内压缩变形特性试验以及分析研究，得出粗粒土的压缩变形特性在不同因素下的影响规律。研究结果表明:提高压实系数，可获得良好的压实效果；增加加载次数可显著增强路基的稳定性，降低路基的变形；为了减小水对路基压缩变形特性的影响，铁路路基应有良好的表面防止雨水入渗、完善的周围排水系统，并重视防洪工作。

Experimental Study on Compressive Deformation of Coarse-grained Fill for Railway Subgrade

Compaction coefficient and water ratio are two important factors affecting subgrade engineering.Increase of compaction coefficient can improve water stability.Regulation of these two factors is the key point to ensure subgrade stability.Combined with the case taking coarse grained soil as the subgrade fill for the second double-track construction of Lanzhou-Xinjiang Railway，a lot of indoor tests of compressive deformation characteristics and the related analysis and study are conducted to obtain the effect laws of such soil’s compressive deformation characteristics under different factors.The results show that:as the increase of compaction coefficient，good compaction effect could be obtained；as the increase of loading times，the subgrade stability could be enhanced significantly and the deformation thereof reduced；and in order to reduce the effect of water on subgrade compressive deformation，rain proof on the surface，perfect surrounding drainage system，and flood control work should be required.