Vertical shaft combined vacuum method precipitation test device and method for saturated soil with an air pocket

The invention relates to a vertical shaft combined vacuum method precipitation test device for saturated soil with an air pocket. The device comprises a test box, and a water injection system, an airinjection system, a water pumping system, a vacuumizing system and a monitoring system all connected with the test box, the water injection system supplies water to a test soil body from bottom to topto obtain a saturated test soil body; the gas injection system simulates generation of gas in a saturation test soil body; the water pumping system pumps water from the test soil body and is used fordewatering the test soil body; the vacuumizing system is used for changing the pore pressure boundary of the soil body, so that vacuum degree is generated in the test box. The invention further provides a test method of the vertical shaft combined vacuum method precipitation test device for the saturated soil body with the air pocket. In the water injection, gas injection, vacuumizing and vertical shaft precipitation test