Abstract
Damped free vibration and resonance of soil are observed by using bender element system. Shear modulus and damping ratio are evaluated in two ways by applying the theory of resonance. Based on the test results on NSF-clay and Akita peat, it is shown that shear modulus can be estimated properly and is larger than that in case that the travel time is defined by the peak of receive wave on usual bender element test. In addition, it is also shown that damping ratio from these methods is almost coincident with that past report. It is proposed that bender element test can be performed in three ways; above two and an usual methods, so that information on damping ratio as well as shear modulus is given.
