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利用TUA2000A型超声波无损检测仪和RMT–150B型岩石力学伺服试验机,对高温度后粗砂岩波速、试件质量与三轴抗压强度进行了研究。研究表明:(1)波速随温度递增呈非线性降低,在400℃~800℃阶段波速降低幅度最大;(2)试件质量虽然随温度增加而减小,但试件质量减小有限,温度影响可以忽略;(3)高温后粗砂岩三轴抗压强度与围压呈线性关系,围压系数为常数,单轴抗压强度理论值受温度与围压影响;(4)高温后粗砂岩内摩擦角保持不变,其黏聚力受温度影响显著;(5)建立含有温度和围压阀值的粗砂岩三轴抗压强度公式,能够准确反映温度、围压对三轴抗压强度的影响。
TUA2000A ultrasonic non-destructive testing instrument and RMT-150B rock mechanics servo testing machine were used to study the wave velocity, specimen quality and triaxial compressive strength of coarse sandstone after high temperature. The results show that: (1) the wave velocity decreases non-linearly with increasing temperature, and the wave velocity decreases most rapidly in the range of 400 ℃ ~ 800 ℃. (2) Although the mass of the sample decreases with increasing temperature, The influence is negligible; (3) The triaxial compressive strength of gritstone after high temperature has a linear relationship with confining pressure, the confining pressure coefficient is constant and the theoretical value of uniaxial compressive strength is affected by temperature and confining pressure; (4) The internal friction angle remains unchanged, and its cohesion force is significantly affected by temperature; (5) The formula of triaxial compressive strength of coarse sandstone with temperature and confining pressure threshold is established, which can accurately reflect the influence of temperature and confining pressure on triaxial compressive strength Impact.