Preparation method of sand foundation model in sand foundation model experiment

The invention discloses a method for preparing a sandy soil foundation model in a sandy soil foundation model test. The operation is as follows: A. Determination of the diameter of the sand outlet hole: according to the relative compactness D of the sandy soil foundation model to be prepared _r , Calculate the diameter of the sand hole d(mm) of the sand head, d=22.41‑0.25D _r , where d≥4D _max ,D _max Be the maximum grain size of the sand; B, the opening of the sand head: set the sand hole at the bottom of the sand head with the aperture as the sand hole diameter d determined in the A step; C, the preparation of the model: the B step made The top of the sand outlet is connected to the sand barrel through a hose. Under the condition of a drop distance of 80cm to 100cm, the sand is dripped and sprinkled to the model box directly below it through the sand outlet of the sand outlet until the sand sample in the model box reaches Just set the thickness. The prepared sand foundation model has small relative compactness error, high accuracy, and good reliability of the data obtained from the test; it can provide more reliable test data for the design and construction of engineering structures on the sand foundation, and more Good guarantee the safety of engineering structures.