EFFECTS OF DENSITY AND MOISTURE CONTENT ON THE DEFORMATION CHARACTERISTICS OF LOESS-LIKE SILT

Take Loess-like silt in areas of Sanmenxia for the study, using unconsolidated undrained shear test method on the unsaturated soils triaxial test instrument, the test were carried by controlling the different dry density and moisture content of the remoded soil preparing to different state of the samples. The results are as follows, Density and moisture content of the test specimen has an important impact on the stress-strain curve of loess-like silt and there will be two kinds of curves such as stress softening curve and stress hardening curve under the different density and moisture content; Partial destruction stress of the test specimen is increasing while the density is increasing and is increasing while the moisture content is decreasing, partial destruction stress of specimen with 7% moisture content is about twice that of specimen with 13% moisture content. Under unsaturated condition, the simple and double-shear planes are main types of the shear failure planes of the test specimen, and under certain moisture content,the destruction shape of the test specimen can appear two kind of phenomena of the dilating and the shrinking with the different dry density.