Shear Wave Velocity and Depth of Soil Layer in Shuozhou City of Datong Basin

On basis of measured shear wave velocity data of a large number of boreholes in the Shuozhou seismic zoning, adopting the linear model, exponential model and polynomial function model, the statistical relationship between shear wave velocity of conventional soil and depth changes in different geological units, different field types and soil physical states was established by using the least squares method. The results show that the shear wave velocity and buried depth in 4 geological units is nonlinear, and its subsection is obvious. The fitting relation and fitting parameters of various soil types were optimized by taking the goodness of fit as the evaluation index, which shows that the fitting degree of quadratic polynomial function model is better than that of linear model and power function model. In order to verify the reliability of the selected fitting formula, shear wave velocity was measured by boreholes in different geological units. The result shows that the predicted shear wave velocity of the fitting formula is consistent with the measured shear wave velocity, it can serve as a reference for the shear wave velocity test in this area and make up for the blank of the research in this area.