Method and device for measuring volume replacement rate of vibroflotation pile and construction optimization method

The invention relates to a vibroflotation pile volume replacement rate measuring method and device and a construction optimization method. The device comprises an actuator, a plurality of gravel samples and to-be-vibroflotation stratum core soil samples. The actuator is used for applying horizontal exciting force to the broken stone sample, so that the broken stone sample enters the simulated vibroflotation stratum to take a core soil sample; the distance between the initial position of the gravel sample and the core soil sample of the quasi-vibroflotation stratum is L2, and the diameter d of the gravel sample is calculated according to a graded gravel proportion designed by a geological exploration report of a quasi-vibroflotation stratum area; a core soil sample of the simulated vibroflotation stratum is obtained by adopting a drilling method to perform core taking on a soil body of the simulated vibroflotation stratum, the core soil sample of the simulated vibroflotation stratum is a cylinder, and the diam