盐渍土路基含盐量的演化规律研究

Study on the Evolution Law of Salt Content in Saline Soil Subgrade

虽然目前针对盐渍土的研究比较多,但基本上都集中在项目勘察设计及建设期,对利用盐渍土填筑的路堤中含盐量随时间变化的规律,国内外研究还比较少。为了探究盐渍土路基填料中含盐量随时间的变化规律,为改建项目中盐渍土路基设计提供理论支撑,本文依托巴基斯坦罗赫里至木尔坦段既有铁路提速改造项目,通过现场调查及大量现场试验,对比分析既有路基填料及两侧原状土中含盐量,总结出盐渍土路基变化规律。结果表明:采用盐渍土填筑的路堤,路基填土中含盐量随着时间推移逐渐降低,逐渐过渡为非盐渍土;对于新建路基采用盐渍土填筑时,采用加宽路基面、放缓路堤坡率等工程措施,同时优先安排施工,静置浸润后,可有效降低路基填料中含盐量,直接采用盐渍土填筑路基既节约工程投资,又能确保路基的安全稳定。

Although there is currently a lot of research on saline soil,it is mainly focused on project survey,design,and construction period.There is still relatively little research on the variation of salt content over time in embankments filled with saline soil at home and abroad.In order to explore the variation of salt content in saline soil roadbed fillers over time and provide theoretical support for the design of saline soil roadbed in the renovation project,this article relies on the existing railway speed-up renovation project from Rohri to Multan in Pakistan.Through on-site investigation and a large number of on-site tests,the salt content in the existing roadbed fillers and the undisturbed soil on both sides is compared and analyzed,and the variation law of saline soil roadbed is summarized.For embankments filled with saline soil,the salt content in the roadbed filling gradually decreases over time and transitions to non saline soil.When using saline soil to fill the newly built roadbed,engineering measures such as widening the roadbed surface and slowing down the slope rate of the embankment should be taken.At the same time,priority should be given to construction.After soaking,the salt content in the roadbed filling can be effectively reduced.Directly using saline soil to fill the roadbed not only saves engineering investment but also ensures the safety and stability of the roadbed.