Since coal and petroleum resources are facing depletion, geothermal resources that can be stably mined for a long time are increasingly valued, especially hot dry rock (HDR). However, thermal shock damage of rock is an unavoidable problem in the development of HDR. The effects of thermal shock fatigue on the physical and mechanical properties and heat conduction of limestone are analyzed in this paper. The limestone is subjected to 1–5 heating and cooling cycles at 100 °C–500 °C. The L* a* b* values, P-wave velocity, thermal conductivity, and tensile strength of the treated limestone are obtained. The experimental results show that the P-wave velocity, thermal conductivity, and tensile strength of limestone decrease with an increase in the temperature for a constant number of thermal cycles. When the temperature is constant, the wave velocity, thermal conductivity, and tensile strength of the limestone decrease with an increase in the number of heating and cooling cycles. In addition, the numerical simulation indicates that the heat treatment temperature, the number of cycles, and the heat transfer time have significant effects on the internal heat transfer of the limestone. Changes in the calcite crystal structure due to fatigue after multiple thermal shocks can lead to cracks between crystals, significantly affecting the physical and mechanical properties of limestone. This study provides insights into the damage characteristics and heat transfer behavior of limestone under thermal shock fatigue, as well as theoretical support for the development of geothermal carbonate reservoirs.

由于煤炭和石油资源面临枯竭，能够长期稳定开采的地热资源越来越受到重视，尤其是干热岩（HDR）。然而，岩石的热震损伤是HDR发展过程中无法回避的问题。本文分析了热震疲劳对石灰石物理力学性能和导热性能的影响。石灰石在 100 °C 至 500 °C 下进行 1 至 5 次加热和冷却循环。获得处理过的石灰石的L* a* b*值、P 波速度、热导率和抗拉强度。实验结果表明，P-对于恒定数量的热循环，石灰石的波速、热导率和抗拉强度随着温度的升高而降低。当温度一定时，石灰石的波速、导热系数和抗拉强度随加热和冷却循环次数的增加而降低。此外，数值模拟表明，热处理温度、循环次数和传热时间对石灰石的内部传热有显着影响。方解石晶体结构在多次热冲击后因疲劳而发生变化，会导致晶体间产生裂纹，显着影响石灰石的物理力学性能。