ASSESSMENT OF SAMPLE QUALITY OF NATURAL DEPOSITED CLAYEY SOILS BY SUCTION AND BENDER ELEMENT TESTS

Abstract

To evaluate the sample quality, shear modulus (G) and suction (p'_r) were measured for specimens extruded from sampling tube under unconfined condition. From a series of tests, it is found that G and p'_r values decrease with disturbance and these values exhibit a strong correlation. Furthermore, G was measured under various effective confining pressures (p'_m) by consolidation and swelling or by applying cyclic loading under undrained condition in the triaxial cell. As a result, it is revealed that G value is calculated by p'_m value regardless of different ways for changing the p'_m values and G value increases with as square root of p'_m. In-situ G values estimated by using laboratory test results are about 70∼80% of G_f values estimated from cone penetration test results.