Test method for single pile vertical static load test under stable confined water condition

The invention discloses a test method for a single pile vertical static load test under the stable confined water condition. The test method comprises the following steps that (1) the size of a model pile and the thicknesses of soil bodies in a box are determined; (2) the water pressure of a pressure bearing layer is determined; (3) soil layers are paved by layers, and the model pile is buried; (4) force transferring water bags are placed; (5) back pressure plates are placed; (6) a vertical loading system and a data acquisition system are placed; (7) the water pressure of the pressure bearing layer is loaded; (8) the loading level is determined, and graded loading is implemented; (9) the pile top is vertically loaded; (10) the vertical compressive ultimate bearing capacity of the model pile is determined; (11) a test device is disassembled; (12) the vertical bearing capacity characteristic value of the single pile is determined; and (13) the pressure of a confined water layer is adjusted, the water pressure of the pressure bearing layer is increased to the next level, and the steps (2) to (12) are repeated to obtain the characteristic values of the pile foundation vertical bearing capacity under different confined water pressure conditions. The test method is good in effect, convenient to operate, low in cost and short in time.