Die Wellenzahlanalyse zur Ermittlung des Baugrundaufbaus bei der Untersuchung von Fundamentschwingungen und Bodenerschuetterungen

In sub-soil models of building sites the shear modulus of the soil, which is related to the shear wave velocity, is used for numerical calculations. By measuring the phase velocity of surface waves (in this work Rayleigh waves) the shear wave profile and henceforth the shear modulus profile of the sub-soil is determined by applying data inversion processes. In this work a new and more accurate method to experimentally determine the phase velocities of Rayleigh waves will be presented. It is based on the method of the wave number analysis and alows an exact determination and separation of surface wave modes. The advantages of the new method is illustrated by comparing the phase velocities determined by different methods. Furthermore, using the boundary element method for different sub-soil models foundation impedances and compliances are determined and compared with experimental results. Some recommendations on how to choose model parameters are made. The effects of a built in block to reduce foundation vibrations and wave propagation is investigated by analysing experimental and numerical data. (orig.)SIGLEAvailable from TIB Hannover: RA 3043(97-1) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman