机场道基毛细水上升高度及处治对策研究

以某机场高富水土基为背景,采用GEOStudio有限元软件,建立精确反映孔隙率、含水量与基质吸力、孔隙水压力相关性的数值模型。分析结果表明:无隔离层黏土道基毛细水上升高度为2.6m;采用砂砾石隔离层可降低毛细水的上升高度,推荐采用0.6m厚级配砂砾石作为隔离层方案,既减小填高和造价,缩短了工期,又减少了对环境的破坏,具有良好的经济效益与社会效益。

Study on Capillary Water Rise in Airport Subgrade and the Countermeasures

On the background of a high water-rich soil foundation for airport, a numerical model reflecting the correlation between porosity, water content and matrix suction, pore water pressure accurately was established with GEO Studio FEM software. The result shows that the rise of capillary water in clay subgrade without separation layer is 2. 6m and that with gravel separation layer may reduce; hence 0. 6m graded gravel is recommended as the separator to reduce not only the filling height, project cost and construction period, but also the damage to environment, showing good economic and social benefits.