Abstract
Measured data from an entire area using a dynamic compaction control device with vibrating rollers are reported and deviations of the measured values are interpreted. Entire area measurement is helpful in reducing geotechnical risk. Even in nominally homogeneous layers the soil stiffness varies from point to point. Using this device, it is possible to detect soft as well as hard spots. Spectral densities of the wave length of soil stiffness are calculated to investigate the spatial variation of soil stiffness. It was found that the amplitude of the waves of soil stiffness is proportional to the wave length. This phenomenon is called a 1/f spectrum or flickering noise: the stiffness variation is composed of long waves with high amplitudes and small waves with small amplitudes. A dominant wave length due to patterns could not be found. The 1/f spectrum has often been observed in natural processes. The phenomenon is illustrated in terms of soil mechanics using a simple generating process.
Published Version
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