A Study on Correcting Method of Undrained Shear Strength for Sample Disturbance

The undrained shear strength of cohesive soils has been widely used in the analysis of stability. Generally, the is determined by the Unconfined Compression Test(UCT), since it is convenient and economical. However, the results by UCT is underestimated in most cases because it is sensitive to workers' skill and sample disturbance. So when analysis using the value obtained from the UCT is used, the degree of sample disturbance must be considered carefully. The purpose of this study is to research the existing methods for correcting (Ladd Method, 1977; Murthy Method, 1982; Shogaki Method, 1998; equation of Tokuda (2000) and Shogaki (2000,2001)) and to consider the validity of the method proposed by the present authors. The results of studying show that the proposed method and Murthy Method are more valid than the others. And compared with the Murthy Method, proposed method can be used more easily, because it needs only the results of unconfined compression test with suction measurement.