关键词: 减压三轴压缩, 变形特征, 破坏特征, 裂隙性黄土

Abstract:

For studying the loess deformation and failure characteristics induced by engineering excavation, we studied the failure characteristics of fissured loess by the decompressed triaxial compression test and obtained the stress-strain curve. The summarization of the deformation and failure characteristics of fissured loess shows that the stress-strain curve of fissured loess is strain-soften type or approximately perfect plasticity, the softening phenomenon turns to be obvious with increase of axial stress, the deformation type is mainly axial and lateral bending deformation; the shear deformation is prone to occur along the original fissure when the fissure angles is 45° or 60°.

Key words: decompressed triaxial compression, deformation characteristics, failure characteristics, fissured loess