EFFECTIVE STRESS AND PARAMETERS OF UNSATURATED LOESS
The determination of effective stress and parameters is an important issue in the effective stress theory of unsaturated soil.The paper proposes a new determination method based on the Blight method and Xingyi Chuan method.Based on the limit concept and the effective stress theory,the equation for effective stress and parameters of unsaturated soil are derived by establishing the relation of the total stress,pore air pressure and matrix suction with the major principal strain.At last,the formula is verified under the two extreme conditions,the saturations of soil are 0 and 1,respectively.The results show that the effective stress parameter can be degraded to 0 and 1 when the saturations are 0 and 1.