论文部分内容阅读
基于非饱和土三轴试验系统,对河南南邓路膨胀土原状样进行了以非饱和膨胀土为原型的相关强度特性研究。结果表明:非饱和膨胀土的吸附强度指标与吸力大小成正比,即吸力大时表现的吸附强度也高,但是两者之间并不呈线性关系,总体上表现为随着吸力增大吸附强度的增加幅度逐渐降低,近似于斜率逐渐减小的上扬抛物线关系,可知吸附强度的增加是有一定限度的,即吸力对吸附强度的贡献有限。此外,若吸力处于较小水平时,曲线的斜率值近似等于饱和土的内摩擦角,而当土样的基质吸力增大时曲线斜率逐渐减小。
Based on the unsaturated soil triaxial test system, the related strength characteristics of unsaturated expansive soil are studied for the original sample of the expansive soil in Nan Deng Road, Henan Province. The results show that the adsorption strength index of unsaturated expansive soil is proportional to the size of the suction, that is, the adsorption strength is high when the suction force is large, but the relationship between the two is not linear. Overall, the adsorption strength Of the increase gradually decreases, similar to the slope of the rising parabolic relationship, we can see that there is a certain limit to the increase of the adsorption strength, that is, the contribution of suction on the adsorption strength is limited. In addition, if the suction is at a low level, the slope of the curve is approximately equal to the internal friction angle of saturated soil, and the slope of the curve decreases as the soil suction increases.