Patent ID: 11940366
Assignee: ZHEJIANG UNIVERSITY
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 6:
7. A testing method of the centrifugal testing device for simulating ground subsidence induced by buried pipeline leakage and infiltration according to claim 1, comprising:
preparation stage: filling model soil in the test soil chamber of the centrifugal model testing device, and injecting circulating water into the water circulation supply chambers; and
simulation test stage: alternately performing infiltration of water into the damaged pipeline model and leakage of water from the damaged pipeline model:
simulating the infiltration of water into the damaged pipeline model: switching the water inlet and outlet control device of the damaged pipeline model to a water outlet condition, and controlling the water circulation supply chambers to supply water to the seepage chambers; stably controlling a water level outside the damaged pipeline model by adjusting a height of the water level limiting hole of the chamber partitioning plate; allowing the water in the seepage chambers to seep into the soil in the test soil chamber; allowing a water-soil mixture to flow into the damaged pipeline model from the crack at the front end of the damaged pipeline model and to leave from the rear end of the damaged pipeline model; allowing water filtered by the water-soil separation device in the soil filtration chamber to enter the water circulation supply chambers, thereby achieving water circulation; monitoring, in the simulation process, the soil pressure, the water pressure and the soil surface displacement of the test soil chamber and the strain of the water-soil separation device in the soil filtration chamber in real time, and obtaining a real-time loss of soil particles based on the strain; and
simulating the leakage of water from the damaged pipeline model: switching the water inlet and outlet control device of the damaged pipeline model to a water inlet condition, and controlling the water circulation supply chambers to supply water to the damaged pipeline model; allowing the water in the damaged pipeline model to flow into the soil in the test soil chamber from the crack at the front end and to seep into the seepage chambers at the two sides of the test soil chamber; stably controlling the water level outside the damaged pipeline model by adjusting the height of the water level limiting hole of the chamber partitioning plate; allowing, when the water level outside the damaged pipeline model reaches the height of the water level limiting hole, the water in the seepage chambers to flow back into the water circulation supply chambers, thereby achieving water circulation; and monitoring, in the simulation process, the soil pressure, the water pressure and the soil surface displacement of the test soil chamber in real time.