Experimental research on temperature evolution of frozen soil under long-term cyclic loading

Uniaxial dynamic compression tests on frozen soil were carried out under different cyclic loadings at -0.5 degrees C - 1.0 degrees C - 1.5 degrees C The temperature of specimen was measured every 5 second during the compression test. The relation curves between the temperature change of specimen and vibration time at different dynamic stress amplitudes and different frequencies are obtained. The results show that the temperature of the specimen will rise under cyclic loadings. The higher dynamic stress amplitude is, the higher temperature rising rate is. When dynamic stress amplitude is in some range, the higher vibration frequency is, the higher temperature rising rate is. The temperature rising value is influenced by whether the specimen could be damaged or not in the test, and it is also influenced by the length of time coming to damage state of the specimen. When dynamic stress amplitude is in some range, the temperature rising value is the maximum under a moderate frequency. Whether the specimen could be damaged is influenced strongly by the temperature rising value for the specimen. If the temperature of the specimen rises continually, the specimen will be damaged sooner or later. The specimen will remain well if the temperature of specimen can maintain steady or decrease because of the heat exchange between the specimen and its surroundings.