Abstract
The flat dilatometer (in-situ) testing device (DMT) has been used frequently North America and Europe during the short period of time since its introduction. The main advantages of the DMT are its simplicity, rapid and repetitive use for geotechnical engineering practice. This paper describes the use of the flat dilatometer (in-situ) testing device (DMT) in Japan. The discussion concentrates on the evaluation of undrained shear strength. Based on the limited available test data in Japan, an attempt has been made to determine the usefulness of Marchetti's equation related to undrained shear strength and to show the important modifications of the Marchetti's equations concerning the evaluation of undrained shear strength. In addition, a new equation has been developed to estimate the undrained shear strength cu obtained from an unconfined compression test to establish a Japanese design manual for clay foundations.
