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以河南南阳地区膨胀土为研究对象,使用可以控制吸力的非饱和土直剪仪进行不同吸力下的非饱和弱膨胀土的直接剪切试验。得出了不同吸力下(吸力范围为50-400kPa),膨胀土粘聚力和内摩擦角的变化趋势。试验结果表明,随着吸力的增大,膨胀土的粘聚力和内摩擦角均增大。其中,在吸力<100 kPa时,粘聚力和内摩擦角的增长趋势随着随吸力的增大而加快,且该趋势接近线性变化。当吸力>100 kPa时,粘聚力和内摩擦角的增长趋势随着随吸力的增大而有所减缓。
Taking the expansive soil in Nanyang area of Henan Province as the research object, the direct shear test of unsaturated weak expansive soil under different suction was carried out by using the unsteady soil direct shear instrument which can control the suction. The change tendency of cohesion and internal friction angle of expansive soil under different suction (suction range: 50-400kPa) was obtained. The experimental results show that with the increase of suction, the cohesion and internal friction angle of expansive soil increase. Among them, when the suction force is less than 100 kPa, the tendency of the increase of cohesion force and internal friction angle increases with the increase of suction force, and the trend changes linearly. When the suction> 100 kPa, the increasing trend of cohesion and internal friction angle decreases with the increase of suction.