恩施地区典型滑坡非饱和土土-水特征曲线的试验研究

非饱和土土-水特征曲线表达了含水率与基质吸力之间的关系,是研究非饱和土的关键。为了进一步了解土质、初始含水率及土体微观结构等重要因素对土-水特征曲线的影响,分别在恩施地区双龙洞滑坡和杨家山滑坡采集土样,进行对比试验研究,结果表明:双龙洞滑坡的土样持水能力强于杨家山滑坡;对于同一种土质,初始含水率对开始阶段的脱水速率影响较大;原状土样被扰动破坏后,持水性增强。同时,对于典型的土-水特征曲线分别利用指数衰减函数和Gardner函数进行了拟合,得到了经验函数表达式,具有一定的实际意义。

Experimental Research on Soil-water Characteristic Curve of Unsaturated Soil for Typical Landslides in Enshi Area

Soil-water characteristic curve(SWCC) of unsaturated soil presents the relationship between moisture content and matrix suction in the soil,and it is the key to the study of unsaturated soil.In order to further understand the impact of soil type,initial moisture content,soil micro-structure and other important factors on the soil-water characteristic curve,this paper studies by contrast the soil samples collected in Shuanglongdong landslide and Yangjiashan landslide.The results indicate: the water-holding c...