ANALYSIS OF THE RELATIONSHIP BETWEEN THE PORE DISTRIBUTIONS AND COLLAPSIBILITY OF LOESS

In order to explore the characteristics of loess microstructure and its relationship with collapsibility,took Q3 loess of Heifangtai at different depth as objects, measured its collapsibility coefficient by using two-test collapsible method, and then used the optical microscope and also utilized image synthesis technology to extract its microstructure image before and after collapse, counted pore area and it's equivalent radius, the composition of the particles and equivalent radius of loess pore were analyzed with their changes by the depth, and also explore the effect the pore distributions have on the collapsibility. With depth increasing, particle size of Heifangtai loess reduced, large pores reduced, small and middle pores increased, the peak pore equivalent radius reduced and the volume of the pore,10m decreases; Soil pore distribution character has a significant impact on its collapsibility, the more large and middle sized pore loess has, the bigger its collapsibility coefficient and the stronger its collapsibility is.