坡体渗流与气温变化相关性分析

发布时间：2018-05-21 02:18

本文选题：气温 + 渗透系数　；参考：《南水北调与水利科技》2017年03期

【摘要】：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。
[Abstract]:Based on the theory of multi-phase flow and multi-field coupling, the variation of temperature with temperature of woodfish package landslide in the three Gorges Reservoir area is calculated by using finite element method, and the influence of temperature change on percolation of slope body is analyzed according to the correlation between temperature and viscosity of water body. The results show that the influence of temperature on the slope temperature is limited to the shallow layer of the slope, the deeper the depth from the surface is, the smaller the influence degree is, and the greater the lag in time is. The change of temperature can change the viscosity of water and cause the change of soil permeability parameters. The calculation shows that the change of slope permeability caused by temperature change is more significant. The influence of air temperature on the permeability coefficient of slope is nonlinear distribution with the depth. The more deeply affected by the temperature change the weaker the influence is from the surface. When the permeability coefficient of slope is larger than the maximum infiltration depth of Rain Water the permeability coefficient of slope body will not change significantly. In addition, the slope permeability coefficient changes seasonally with the temperature, the summer temperature is higher than the slope soil temperature, the permeability coefficient decreases with the depth increase, the winter slope temperature is higher than the temperature, the permeability coefficient increases with the depth increase.
【作者单位】：三峡大学水利与环境学院;
【基金】：国家自然科学基金(51279090)~~
【分类号】：TV698.12

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