Figure 9
From: Acoustic characterization for creep behaviors of marine sandy hydrate-bearing sediment
A comparison of loading path and acoustic main frequency amplitude for sandy hydrate-bearing sediment during creeping. The loading paths are depicted in dot line, and the main frequency is presented in marked solid line. (a) and (c) Compare the evolutionary behaviors of the main frequency amplitude of the compressible wave under different experimental conditions. (b) and (d) Compare the evolutionary behaviors of the main frequency amplitude of the shear wave under different experimental conditions. Typical changes marked with red-edged circles occur when the axial load reaches the long-term strength, whereas that marked with light blue-edged circles occur at the moment when accelerated creep appears.
