Abstract Large temperature changes may cause degradation in physical and mechanical properties of rocks. This degradation can be influenced by heating-cooling procedure. In this study, it is proposed to investigate the influence of cooling method after heating to high temperature on the degradation of physical and mechanical properties of granite. For this purpose, two different cooling procedures are considered, the rapid cold water cooling and the slow step-by-step cooling. Two groups of granite samples are first heated to a desired temperature ranging from 25 °C to 900 °C, and then cooled respectively by using these two methods. The porosity and ultrasonic velocity of the thermally treated samples are measured. Uniaxial and triaxial compression tests are also performed to evaluate the elastic properties and compression strength. It is found that for both groups of samples, the thermal treatment induces the porosity increase, the wave velocity decrease and the modification of elastic modulus and compression strength. But the modification of mechanical properties is clearly influenced by the thermal treatment procedure.

中文翻译：

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冷却速度对花岗岩物理力学性能热降解的影响

摘要 大的温度变化可能导致岩石物理力学性质的退化。这种降解会受到加热-冷却过程的影响。本研究拟探讨加热至高温后冷却方式对花岗岩物理力学性能退化的影响。为此，考虑了两种不同的冷却程序，快速冷水冷却和缓慢逐步冷却。两组花岗岩试样首先加热到所需温度25℃～900℃，然后分别用这两种方法冷却。测量热处理样品的孔隙率和超声波速度。还进行了单轴和三轴压缩测试以评估弹性性能和压缩强度。发现对于两组样品，热处理均引起孔隙率增加、波速降低以及弹性模量和抗压强度的改变。但机械性能的改变显然受热处理程序的影响。