Subsidence observation standard embedding: the pile body is selected to be Φ20mm steel bar, the top is rounded and the cross line is drawn, and the bottom is welded with hooks. After the construction of the graded gravel on the surface of the foundation bed is completed, it is buried at the design position by measurement and the embedding depth is not less than 0.3 m, the pile circumference is 0.15m fixed with C20 concrete pouring, and the height of the pile top is measured as the initial reading after the completion of embedding.