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建立了采用Richards土水运动方程和土水特征曲线计算土柱毛细水上升高度的方法,并开展了系统的数值模拟分析,研究了基底垫层的土质、级配以及厚度对膨胀土路基毛细水上升高度的影响规律。结果表明:毛细水的上升高度随着垫层厚度的增加、初始含水量的升高以及级配的变差而增加,级配对毛细水上升的影响最为显著,各垫层材料对毛细水上升的阻隔作用由优到劣依次为级配不良均匀砂、级配不良砂、石灰改性土、级配良好砾。建议首选20 cm厚的均匀砂,或者采用30 cm厚的级配不良砂或石灰改性土作为膨胀土路基垫层,这样可以有效保证路基的水稳性。
The method of calculating the height of soil capillary water using Richards equation of soil-water movement and soil-water characteristic curve was established and the numerical simulation analysis of the system was carried out. The effects of the soil, gradation and thickness of the basement cushion on capillary water Rising height of the law of influence. The results showed that the rising height of capillary water increased with the increase of cushion thickness, initial water content and gradation, and gradation had the most significant effect on capillary water rise. Barrier from superior to inferior followed by poor grading uniform sand, graded bad sand, lime modified soil grading good gravel. It is recommended to use a uniform sand of 20 cm thickness, or use a 30 cm thick graded bad sand or lime-modified soil as the expansive soil subgrade cushion, which can effectively ensure the water stability of the subgrade.