Near Foundation Soil Stiffening Evaluation after Resins Injection by a Novel 3D Interpretation of Surface Waves Data

The characterization of soil settlements below foundations of buildings using surface waves methods represent an extreme challenging problem because of the presence of localized shear waves variation and shallow heterogeneity. To tackle the near-foundation shear waves distribution reconstruction challenge a method for the elaboration of surface waves recordings unbound from both rigid field geometry and from the classic layered subsurface assumption would be highly desirable. We introduce a novel elaboration strategy of surface waves data, based on the Direct Interpretation of Phase Lags (DIPL-3D)among pairs of seismic signals which aims to retrieve the three dimensional shear waves velocity subsurface distribution without using inversion. As an example application, the method is used for the evaluation of near foundation soil stiffening after an expanding resins injection intervention