RESEARCH ON THE EFFECT OF GRAIN SIZE COMPOSITION AND STRUCTURE ON THE MATRIC SUCTION OF UNSATURATED LOESS

In order to investigate the effect of grain size composition and structure on the matric suction of unsaturated loess, the washing method is used to measure the SWCC and the particle density distribution curves with the preparation of the original state, remodeling, separation of fine and coarse particle size of a total of four L5 loess samples at Jingyang country. The experimental results show that the structure of the samples of undisturbed loess increases the maximum pore radius, increases the uniformity of the pore distribution of the loess, and leads to the decrease of the Air entry value of SWCC, and the slope inthe rapid descending segment of the water content becomes gradual. The dominant peak value of the density distribution of the soil particle size distribution of the structure has a significant effect on the Air entry value of SWCC.