The effect of dry density and soil water content on yellow soils hearing strength in karst area

Based on the triaxial shearing test in laboratory, the effect of soil water content and dry density on yellow soil shearing strength was determined. Experimental data indicated that: (1)the soil cohesive force firstly increase and then decrease with the increase of soil water content under the same soil dry density, and it increase with the increase of soil dry density under the same soil water content. The internal frictional angle of yellow soil fleetly decrease with the increase of soil water content under the same soil dry density, and it do not change obviously with the increase of dry density under the same soil water content. (2) The interaction of soil water content and dry density has significant impact on soil cohesive force, and the soil cohesive force reached to the maximum under the interaction of soil water content and dry density that each soil dry density matched the specifically soil water content. (3) The interaction of soil water content and dry density is small relatively on the internal frictional angle, and the internal frictional angle tardily increase with the increasing of soil dry density. Soil water content have relatively more obvious impact on the internal frictional angle, and the internal frictional angle of yellow soil nonlinearly decrease with the increasing of soil water content.