Seismic monitoring short-duration events : liquefaction in 1g models

摘要: The duration of liquefaction in small models is very short, therefore special monitoring systems are required. In an exploratory sequence tests, S-wave transillumination implemented with a high repetition rate to provide detailed information on the evolution shear stiffness during liquefaction. These data complemented measurements acceleration, time-varying settlement, excess pore pressure, and resistivity profiles. Measurements show that pressure migration from liquefied deep layers may cause or sustain zero effective stress condition shallow layers, multiple events take place given formation for excitation level, unsaturated also reach condition. time scale dissipation fully submerged specimens related particle resedimentation diffusion; downward drainage contribute additional scale...