Experimental study on strength and yield properties of unsaturated disturbed loess

To study the strength and yield properties of unsaturated disturbed loess,a series of triaxial shear tests of loess were done on the condition of suction control.Study the stress-strain curves,the strength and yield properties of disturbed loess.The test results show that the failure model of disturbed loess is shown with plastic failure; the stress-strain curves of disturbed loess will change from strain softening to strain hardening with different confining pressure under same suction; the strength envelope of disturbed loess is distributed with linear in the plane of p-q; the cohesion of disturbed loess has a linear increase with the increase of suction,but the friction angle is found to have little change with the change of suction.The curves of ev-log( q /p) of loess has three-stage with different suction,and the yield stress( ps,qs) of unsaturated disturbed loess was acquired.