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通过单轴压缩试验,对不同高温后熔结凝灰岩、花岗岩及流纹状凝灰角砾岩的力学性质进行了研究,分析比较3种岩石峰值应力、峰值应变及弹性模量随温度的变化规律,并研究了峰值应力与纵波波速、峰值应变与纵波波速的关系。试验升温等级设为20℃,200℃,400℃,600℃,800℃五级,升温速度为30℃/min。试验结果表明,高温后3种岩石的峰值应力、弹性模量均有不同幅度的降低,且经历的温度越高,降低的幅度越大。对于峰值应变,熔结凝灰岩、花岗岩的峰值应变随温度的升高而大幅度的增加;但对于流纹状凝灰角砾岩,峰值应变随着温度的升高在降低。此外,峰值应力与纵波波速、峰值应变与纵波波速的关系依赖于不同的岩石而表现出不同的规律。
Through the uniaxial compression test, the mechanical properties of the fused tuff, granite and rhyolite tuffaceous breccia at different high temperatures were studied. The variation of peak stress, peak strain and elastic modulus with temperature were analyzed and compared , And studied the relationship between peak stress and longitudinal wave velocity, peak strain and longitudinal wave velocity. Test temperature level set to 20 ℃, 200 ℃, 400 ℃, 600 ℃, 800 ℃ five, heating rate of 30 ℃ / min. The experimental results show that the peak stress and elastic modulus of three kinds of rocks decrease with different amplitude after high temperature, and the higher the temperature, the larger the decreasing extent. For the peak strain, the peak strain of the fused tuff and granite increases with the increase of the temperature. However, the peak strain decreases with the increase of the temperature for the rhyolite tuff breccia. In addition, the relationship between peak stress and longitudinal wave velocity, peak strain and longitudinal wave velocity depends on different rocks and shows different laws.