The invention provides a device and a method for testing a long-time
mechanical property degradation process under a dry-wet cycle. The device comprises a triaxial pressure chamber, a loading
system, a gas-liquid reactor, an inlet
dew point sensor, an outlet
dew point sensor, a
vacuum pump and a
tail liquid pump. The gas-liquid reactor is used for preparing gas-liquid mixtures with different
humidity by adjusting the temperature and the gas-
liquid ratio and conveying the gas-liquid mixtures to the triaxial pressure chamber; the double-path
dew-point sensor is used for monitoring the
humidity of a sample inlet and a sample outlet in real time so as to judge the internal
humidity balance. During testing, the
system is firstly vacuumized, sample humidity balance pretreatment is performed, and then a graded loading
creep test under constant humidity is selected, or a dry-wet cycle
creep test is performed by regulating and controlling a gas-liquid reactor under
constant stress. According to the device and the method, synchronous
coupling of stress loading and an accurate and controllable dry-wet cycle environment is realized, the dynamic degradation rule of mechanical parameters of a geotechnical material under the combined action of long-term loading and dry-wet alternation can be accurately revealed, and an effective test and analysis means is provided for long-term stability evaluation of
geotechnical engineering.