自然环境下盐渍土路基水盐分布与迁移

Distribution and Migration of Water and Salt in Roadbeds on Salty Soil in Natural Environment

针对新疆硫酸盐渍土地区道路每年10月底路面开始发生不均匀隆起、开裂的现象,选择处于自然环境中的典型硫酸盐渍土路段,对其道路中心线和左、右路肩部位进行路基含盐量调查。结果表明,隔断层对阻止盐分向路基顶面迁移有明显效果,但也加剧了其下盐分的积聚。隔断层的"覆盖效应"明显,土工膜的覆盖效应强于风积砂。在工程中选择隔断措施时应考虑其长期应用效果。

In allusion of uneven upheaval and cracking beginning on pavement at the end of October every year after completion of roads in sulfuric acid saline soil area of Xinjiang in recent years, this paper investigates salt content in roadbed at the parts of center line and left/right shoulders by choosing typical sulfuric acid saline soil sections in natural environment. The result shows that insulating course exhibits obvious effect for blocking migration of salt towards the top of roadbed, but also intensifies accumulation of salt below it; the ＂ covering effect＂ of the insulating course is obvious, and the covering effect of geotechnical wax is better than eolian sand. Therefore, long-term performance should be considered when insulating measures are selected.