Patent ID: 7483791
Filing Date: 2009-01-27
Classification: E01C,E02D

Abstract:
1. A method for determination of soil stiffness levels of a soil area, whereas one and the same self-propelled apparatus ( 1 ) is used not only to determine the absolute soil stiffness level (k B ) when located on at least one predetermined soil subarea ( 3 ) of the soil area but also to determine a plurality of relative soil stiffness levels(s) while crossing over a plurality of soil subareas of the soil area, comprising: in order to determine an absolute soil stiffness level (k in order to determine a plurality of relative soil stiffness levels(s) of a plurality of soil subareas, moving the vibration unit ( third data items representing a lowest subharmonic frequency of a second oscillation response of the oscillation of the vibration unit (