采用TAW-3000型三轴伺服多场耦合试验系统，对细粒大理岩试样进行不同围压下经历不同热循环次数的三轴压缩试验，分析对比不同条件下大理岩的峰值强度、峰值应变、弹性模量的变化规律。由室温以10 ℃/min的速率加热至400 ℃后恒温4 h，再缓慢恢复至室温，这称为一次热循环。热循环次数设为0次、1次、2次、4次、8次5级，围压设为0、5、10、15、20、25、30 MPa 7级。研究结果表明，经历了热循环作用岩样的物理力学性质发生明显劣化，峰值应力、弹性模量均有不同程度的降低，并且热循环次数越高，降低幅度越大；峰值应变随着热循环次数增大而增大，但增大速率逐渐降低。

This paper adopts TAW-3000 three-axis servo multi-field coupling test system, triaxial compression test of fine-grained marble samples subjected to different thermal cycles under different confining pressures，then compares the variation of peak strength, peak strain and elastic modulus of marble under different conditions. Thermal cycle is heated from room temperature to 400 ℃ at a rate of 10 ℃/min and then kept at a constant temperature for 4 h, and then room temperature is regained slowly. The number of thermal cycles is set to 0, 1, 2, 4, and 8 times, and the confining pressure is set to 0, 5, 10, 15, 20, 25 and 30 MPa. The results show that the physical and mechanical properties of the rock samples undergoing thermal cycling are significantly degraded, and the peak stress and elastic modulus are reduced to varying degrees, and the higher the number of thermal cycles is, the greater the reduction is. The peak strain increases as the number of thermal cycles increases, but the rate of increase gradually decreases. After the confining pressure is set, the mechanical properties of the rock sample are obviously improved. The peak stress, peak strain and elastic modulus increase with the increase in confining pressure.