ベンダーエレメントによる砂の液状化時のせん断波速度測定

概要

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The velocity of shear wave propagation of sand was measured by using a pair of piezoceramic bender elements, fixed at the top cap and pedestal of the triaxial apparatus. The element at the top cap operated as a wave transmitter, while the one located at the pedestal operated as a wave receiver. Maximum shear modulus G_<max> of soil can be calculated from the shear wave velocity V_s as G_<max>=ρ・V^2_S where ρ is the total mass density of the soil. Maximum shear modulus G_<max> of soils during liquefaction is very important to design the underground structure considering the soil-structure interaction. In order to investigate the changes of maximum shear modulus during liquefaction tests in the laboratory, shear wave velocities were measured by bender elements during liquefaction tests of sands. Moreover, the changes of shear wave velocities during isotropic compression and post-liquefaction were also measured. The relationships between shear modulus and effective confining pressure of Toyoura sand and undisturbed Edo river sand were obtained by using bender elements.
山梨大学の論文