黏土含水率空间分布规律的模型试验研究

An Experimental Study of Clay Model for Spatial Distribution Rule of Moisture Content

黏土含水率对土体粘聚力影响较大,且会影响雨水入渗边坡过程,进而影响到边坡的稳定性。本文通过模型试验,获得了黏土含水率随深度的空间变化关系,并拟合了含水率的深度函数关系。结果表明:表面水平且无地下水位时,黏土含水率随深度变化较小,可近似按直线拟合;表面水平且有地下水位时,深度超过10cm后,含水率变化较明显,含水率随深度可按二项式拟合;无地下水位时坡面下深20cm以内含水率变化较大,含水率不稳定,若含水率随深度按线性拟合,坡脚处变化较小,而坡顶和坡中处变化较大。

The cohesive of clay is influenced greatly by the moisture content. And the moisture content could affect the process of rainfall infiltration into side slope, which affects the stability of the slope.In this paper, through model test, the relationship and fitted function of the clay moisture content to the depth could be obtained. The results show that the change of clay moisture content with depth is small under the surface level and without underground water. And the relationship of moisture content to the depth could be fitted linear. Under the surface level and underground water, the change of moisture content is more obvious after more than 10 cm depth. And the moisture content with depth could be fitted according to the binomial function. The moisture content is unstable within 20 cm depth with underground water level of clay slope. The change of moisture content is smaller at the foot of slope, bigger at the top and middle of slope surface if the relationship of moisture content to the depth could be fitted linear.