To study the influence of thermal shock caused by water-cooling on the physical and mechanical properties of high-temperature granite, granite was subjected to an increasing number of high-temperature (300 °C) water-cooling and thermal shock treatment cycles, and static mechanical experiments were carried out on the treated granite. The results support the following conclusions: (1) thermal shock causes an increase in the number and size of the pores and cracks within the granite; thus, its volume expands, density decreases, water absorption rate increases, and P-wave velocity decreases. (2) With an increase in the number of thermal shocks, both the compressive strength and tensile strength of the granite decrease, and there is a linear relationship between the compressive strength and tensile strength. (3) With an increase in the number of thermal shocks, the plasticity of the granite increases and its resistance to deformation weakens, which is manifested as a decrease in both the compressive modulus and tensile modulus of the granite. After 15 cycles of thermal shock, the compressive elastic modulus and tensile modulus of the granite decreased by 25.18% and 46.76%, respectively. (4) The m and s values of the damaged granite were calculated based on the Hoek–Brown empirical criterion, and it was found that both of these parameters decrease with the increase in the number of thermal shocks. The calculation results can provide a reference for engineering rock mass failure.

中文翻译：

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经历多次水热循环的花岗岩力学测试

为了研究水冷引起的热冲击对高温花岗岩的物理和机械性能的影响，对花岗岩进行了越来越多的高温（300°C）水冷和热冲击处理循环，以及对处理后的花岗岩进行静态力学实验。结果支持以下结论：（1）热冲击导致花岗岩中孔隙和裂纹的数量和大小增加；因此，它的体积扩大，密度降低，吸水率提高，P波速度降低。（2）随着热冲击次数的增加，花岗岩的抗压强度和抗拉强度均降低，并且抗压强度和抗拉强度之间存在线性关系。（3）随着热冲击次数的增加，花岗岩的可塑性增加并且其抗变形性减弱，这表现为花岗岩的压缩模量和拉伸模量均降低。经过15次热冲击后，花岗岩的压缩弹性模量和拉伸模量分别下降了25.18％和46.76％。（4）根据Hoek-Brown经验准则计算了受损花岗岩的m和s值，发现这两个参数都随着热冲击次数的增加而减小。计算结果可为工程岩体破坏提供参考。这表现为花岗岩的压缩模量和拉伸模量均降低。经过15次热冲击后，花岗岩的压缩弹性模量和拉伸模量分别下降了25.18％和46.76％。（4）根据Hoek-Brown经验准则计算了受损花岗岩的m和s值，发现这两个参数都随着热冲击次数的增加而减小。计算结果可为工程岩体破坏提供参考。这表现为花岗岩的压缩模量和拉伸模量均降低。经过15次热冲击后，花岗岩的压缩弹性模量和拉伸模量分别下降了25.18％和46.76％。（4）根据Hoek-Brown经验准则计算了受损花岗岩的m和s值，发现这两个参数都随着热冲击次数的增加而减小。计算结果可为工程岩体破坏提供参考。并且发现这两个参数都随着热冲击次数的增加而减小。计算结果可为工程岩体破坏提供参考。并且发现这两个参数都随着热冲击次数的增加而减小。计算结果可为工程岩体破坏提供参考。