试验装置的原理图。1。加载框架;2。轴向加载液压缸;3所示。位移传感器;4所示。压力传感器;5。 Servo hydraulic station; 6. Triaxial compression chamber; 6-1. Coal sample; 6-2. Heat shrinkable tube; 6-3. Circumferential extensometer; 6-4. Temperature sensor; 7. Constant-temperature oil bath; 8. Data acquisition system; 9. Gas cylinder; 10. Gas mass flow meter; 11. Vacuum pump;