Attenuation and Hysteresis of Saturated Rocks Under Cyclic Loading

Abstract

AbstractHysteresis such as stress‐strain loop, “X” shape of instantaneous modulus and Poisson's ratio, and effect of strain amplitude on attenuation of saturated rocks is analyzed under cyclic loading with experiments of fluid saturated sandstones and marbles. We think that the attenuation of rock is in proportion to the strain amplitude of the applied cyclic loading, and the b value of attenuation is a measurement of saturated rock's attenuation under cyclic loading. We discuss the possible micro mechanisms of attenuation and hysteresis at low frequencies by the macro behavior of saturated rocks in uniaxial stress cycling test. The flow of porous fluid might play an important role in attenuation and hysteresis of porous rock, and both the grain contact adhesion and stick‐slip friction might be the factors of porous saturated rock's hysteresis and attenuation in high stress, low frequency cycling test.