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非饱和土中由于有孔隙气的存在而使得非饱和土的力学性质变得非常复杂。气体对非饱和土体强度和变形会产生重要影响。根据12组不同饱和度、不同干密度云南红黏土土样的三轴不排气、不排水剪切试验结果,讨论了气体对非饱和土土体强度和变形的影响。黏聚力在不排气剪切情况下随着饱和度的变化不是单调的,内摩擦角则随着饱和度的增大而减小。干密度增大则黏聚力和内摩擦角都增大。在三轴不排气剪切过程中,试样出现了明显了的剪胀性,且随着干密度的减小,饱和度的增大剪胀性逐渐消失。试样最后的破坏形态与是否发生剪胀可能也有联系。
In unsaturated soil, the mechanical properties of unsaturated soil become very complicated due to the existence of porous gas. Gas has important influence on the strength and deformation of unsaturated soil. Based on the results of 12 groups of triaxial un-drained and undrained shear tests of Yunnan red clay samples with different saturations and dry densities, the effect of gas on the strength and deformation of unsaturated soils was discussed. Cohesion in the case of non-exhaust shear changes with the saturation is not monotonous, internal friction angle decreases with increasing saturation. Dry density increases the cohesion and internal friction angle increases. In the triaxial non-exhaust shearing process, the specimen showed obvious dilatancy, and with the decrease of the dry density, the dilatancy gradually disappeared when the saturation increased. The final failure state of the specimen may also be related to whether dilatancy occurs.