Vacuum pre-loading combined electric process test apparatus and test method thereof

The invention relates to a vacuum pre-loading combined electric process test apparatus and a test method thereof, and belongs to the field of geotechnical engineering foundation treatment. The apparatus comprises a power supply part, a vacuum pump part and a box body part. The box body part is a transparent toughened glass box, soil in the box body is coated with a sand cushion, and the front side of the box body is provided with equidistant electric potential monitoring point hole sites. Cylindrical hollow graphite rods are inserted to two sides of the box body as a cathode and an anode, and the anode is a salt solution injection channel. A plastic water draining plate is inserted to a position close to the cathode, the top end of the water draining plate is positioned in the sand cushion and is connected with a conical flask through a rubber tube, and a vacuum pump is connected with the conical flask through the rubber tube. The invention also provides a method for carrying out vacuum pre-loading combined e