Testing device for simulating expansive soil slope crack development process under dry-wet cycle effect

The invention belongs to the technical field of geotechnical engineering, and particularly relates to a testing device for simulating the expansive soil slope crack development process under the dry-wet cycle effect. The device comprises a model box internally provided with an expansive soil slope, the top surface and the front surface of the model box are both open, and the expansive soil slope is arranged opposite to the front surface of the model box; and a drain hole is formed in the bottom of the model box, and a rainfall device for simulating natural rainfall and a heating device for simulating natural illumination are arranged above the expansive soil slope. According to the invention, the rainfall device is located above the expansive soil slope, and in the process of simulating natural rainfall, rainfall acts on the expansive soil slope from top to bottom; therefore, compared with a mode of carrying out a simulation test through a centrifugal machine, the test device for simulating the expansive soil