Experimental Research on Anelastic Mechanism of Saturated Rocks
饱和岩石滞弹性弛豫机理的实验研究

Sine wave loading experiments were performed to simulate seismic wave by using Metravib Dynamic Mechanical Analyzer.Fixed 100N static load and 60N sine wave dynamic load were applied.The total loading force was controlled under the yield stress.Temperature was controlled between-50℃ and 90℃;heating speed was maintained onto 1℃ per minute,and the frequency was controlled between 5Hz~400Hz.Pump-oil saturated Pengshan sandstones and Suining sandstones were tested under uniaxial cyclic loading.The variations of attenuation,imaginary modulus,real modulus and velocity with temperature and frequency were obtained.The attenuation peak and the imaginary modulus peak shift to higher temperatures when the frequency increases due to the thermal relaxation phenomena.Both Young’s modulus and wave velocity decrease with the temperature increase but increase with frequency increase and with obvious frequency dispersion.Young’s modulus and wave velocity decrease when the dynamic load increases.Experimental results are similar to that from low-frequency resonance standing wave experiments,which indicates that thermal relaxation regularities generally exist in saturated porous rocks.