Dry-wet system for roadbed model expansion test

The invention discloses a dry-wet system for a roadbed model expansion test and a test method. The dry-wet system comprises a test box body, a temperature change and rainfall integrated simulation system and a data acquisition system. The test box body is formed by adding vacuum laminated glass to a steel structure frame, the test box body is filled with red layer mudstone filler in a layered mode to simulate the high-speed rail roadbed in the red layer area, the temperature change and rainfall simulation system is used for achieving simulation of temperature change and rainfall in the natural state, and data monitored by all sensors are collected through the data collection system. According to the invention, the influence mechanism of dry-wet cycle and temperature change on the deformation of the red-layer mudstone roadbed can be determined, the foundation for evaluating the stability of the high-speed railway roadbed crossing the red-layer region is established, and the technical blank in the aspect of ind