不同工法下高含盐细砂区路基沉降规律研究

Research on the Settlement Law of Subgrade in the Regions of Fine Sand with High Salinity under Different Construction Methods

研究目的:为了探究不同工法对高含盐饱和细砂地区路基沉降规律的影响,为这类地区的地基处理、路基填筑和路基病害防治提供理论依据和应用指导,基于实际工程,通过现场试验测试和数值模拟计算,对该类地区路基在不同工法下的沉降规律和变形机理进行对比分析。研究结论:(1)对路基的预压处理能够加速路基的沉降变形过程,使路基提前进入稳定状态;(2)对路基的处理采取不挖掉盐壳,而是直接在盐壳上进行碾压处理,达到相关压实标准后,继而进行路基填筑的方式可以减小工后沉降量;(3)以路基沉降基本稳定后再进行铺轨为原则,推荐线路上部结构铺设的合理时间为竣工后180 d;(4)该研究成果可为盐渍土地区的路基设计与施工提供参考依据。

Research purposes：In order to investigate the effect of different construction methods on the settlement law of subgrade in the regions of high salt saturated fine sand and provide theoretical basis and application guidance for the foundation treatment, the subgrade filling and the subgrade disease control in the similar areas, based on practical engineering, field test and numerical simulation, a comparative analysis on the subgrade settlement law and deformation mechanism was carried out under different subgrade treatment methods.Research conclusions： （ 1 ） The prepressing steady state. （2） The method of not digging treatment of out salt crust subgrade can accelerate the settlement of the s can reduce the settlement after construction of ubgrade into the subgrade, which put the rolling process on salt crust directly and then start subgrade filling. （3） According to the principle of track - laying after basic stability of subgrade settlement, it is recommended that the reasonable time for upper structure laying should be 180 days after the project completion. （4） The research results can be used in some saline soil subgrade engineering.