气候作用下红黏土边坡湿热迁移特性及数值模拟分析

Moisture and Heat Transfer Characteristics and Numerical Simulation of Red Clay Slope Under Climate Impact

红黏土边坡的湿热迁移特性对土体强度及整体稳定性具有重要影响。为此,在广西桂林市桂林理工大学雁山校区内建立了红黏土边坡现场监测系统,跟踪监测红黏土边坡含水率和温度随季节的变化规律。在此基础上,利用有限元分析软件GeoStudio进行有限元数值模拟。结果表明:红黏土边坡的湿热特性受大气作用影响显著,土体含水率和温度随季节的变化呈正弦波动变化。土体含水率主要受降雨和蒸发的影响,土体温度主要受大气温度和太阳辐射影响。温度的变化随着深度的增加呈现明显的滞后性,温度的变化可以间接反映土体水分的迁移特性,两者的耦合作用促使土体湿热发生迁移。

Moisture and heat transfer characteristics of red clay slope is very important to the soil strength and its overall stability.Therefore,a red clay slope monitoring system has been established in Yanshan campus of Guilin University of Technology to track and monitor the seasonal variation of water content and temperature of red clay slope.On this basis,finite element analysis software Geostudio is adopted to carry out finite element numerical simulation.The results show that the moisture and heat characteristics of red clay slope have been significantly affected by atmospheric action,and the soil moisture content and temperature fluctuate sinusoidally with seasonal variation.Soil moisture content is mainly affected by rainfall and evaporation,and soil temperature is mainly affected by atmospheric temperature and solar radiation.Temperature changes show obvious hysteresis with the increase of depth.Temperature changes can indirectly reflect the characteristics of soil moisture migration.The coupling effect of the two factors promotes soil moisture and heat migration.