坡体渗流与气温变化相关性分析

基于多相流及多场耦合理论,采用有限单元法计算了三峡库区木鱼包滑坡体温度随气温变化情况,进而依据温度与水体黏滞性的相关关系分析气温变化对坡体渗流的影响。计算表明,坡内温度受气温影响仅限于坡体浅层区域,距地表深度越深,影响程度越小,在时间上的滞后性越大。温度变化可改变水的黏滞性,进而引起土体渗透参数的改变,计算表明因气温变化引起的坡体渗透性改变较为显著。坡体渗透系数受气温变化的影响随深度呈非线性分布,距地表越深受气温变化的影响越弱,通常大于雨水最大入渗深度以后,坡体渗透系数不再发生显著变化。另外,坡体渗透系数随气温呈现季节性变化规律,夏季气温高于坡内土体温度,渗透系数随深度的增加而减小;冬季坡体内温度高于气温,渗透系数随深度的增加而增加。

The correlation analysis of atmospheric temperature change and slope seepage

Based on the multi-phase flow & multi-field coupling theory, this paper adopted the finite element method to calculat e the t emperature distribut ion of Muyubao landslide as the atmospheric temperature changes. Further, it analyzed the influence of atmospheric temperature changes on the slope seepage according to the correlat ion between temperature and viscosity of w at er. The results of calculat ion showed that the effectof atmospheric temperature on temperature of the slope body is limited to the shallow surface; as the depth increases, the influence decreases and the hysteresis increases concurrent ly. The mobilit y of the water is affected by the change of the slope body's temperature and it can change the water permeability in the inner slope. The effectof atmospheric temperature on permeability coefficientof the slope has a nonlinear relationship with depth. The effectof atmospheric temperature on the permeabilit y coefficient declines as the depth increases. Generally, the permeability coefficientof the slope no longer change significantly when the depth is deeper t han The maximum depth of infiltration. The permeability coef-ficientof the slope shows seasonal variation with the atmospheric temperature. The permeability coefficient decreases with the increase of depth when the atmospheric t em perat ure is higher than The soil in summer. In cont rast, the permeabilit y coefficient increases w ith the increase of depth in w int er.