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通过Metravib热机械分析仪,用正弦波加载方式,模拟地震波的传播。实验时固定静载为100N,正弦波动载荷恒为60N,将总载荷控制在屈服点以下。在温度为-50℃~90℃,升温速率保持在1℃/分,频率为5Hz~400Hz的条件下,对饱和泵油彭山砂岩和遂宁砂岩样品进行单轴循环加载实验,获得饱和泵油彭山砂岩和遂宁砂岩的衰减、虚模量、实模量、波速与温度和频率以及动载荷的关系。以此研究了饱和多孔岩石的衰减和虚模量、杨氏模量和弹性波波速随温度和频率的动态响应。取得了随频率增高,饱和多孔岩石的衰减峰和虚模量峰的峰位向高温方向移动的热激活弛豫机制。杨氏模量和弹性波波速随温度升高而下降,随频率增高而增大,具有频散效应;杨氏模量和弹性波波速随动载荷振幅的增大而降低。这些结果与低频共振的驻波实验取得了同样的热激活弛豫规律,说明热激活弛豫规律具有一定的普适性。
Through the Metravib thermomechanical analyzer, the propagation of the seismic waves is simulated using a sine wave loading method. Fixed static load test for the 100N, sine wave load constant for the 60N, the total load control in the yield point below. Under the conditions of the temperature of -50 ℃ ~ 90 ℃, the heating rate kept at 1 ℃ / min and the frequency of 5Hz ~ 400Hz, the saturated pump oil Pengshan sandstone and Suining sandstone samples were subjected to uniaxial cyclic loading test The relationship between attenuation, virtual modulus, real modulus, wave velocity, temperature and frequency, dynamic loading of Pengshan sandstone and Suining sandstone. In this paper, the dynamic responses of saturated porous rock to attenuation and imaginary modulus, Young’s modulus and elastic wave velocity with temperature and frequency are studied. The thermal activation relaxation mechanism was obtained as the frequency increased, the peak positions of the attenuation peak and the dummy peak of the saturated porous rock moved toward high temperature. The Young’s modulus and elastic wave velocity decrease with increasing temperature and increase with increasing frequency, and have the dispersion effect. The Young’s modulus and elastic wave velocity decrease with the increase of dynamic load amplitude. These results obtained the same thermal activation relaxation law as the low-frequency resonance standing wave experiment, indicating that thermal activation relaxation law has a certain universality.