Abstract
In order to evaluate the drainage effect of gravel drains against liquefaction, a series of cyclic shear tests has been performed on a saturated sand under partially drained conditions by triaxial testing equipment installed a drainage valve. Firstly, the nature and strength characteristics of saturated sand under partially drained cyclic shear conditions were investigated. Then the cyclic strength under partially drained condition was formulated based on the testing results. A simplified method for designing gravel drains based on FL method was developed by the formulated strength. As a trial design result of gravel drains coordinated the proposed method and the method based on seepage flow analysis, the propriety of the proposed method was recognized.
