Experimental Soil Parameters by Different Evaluation Methods for Impulsive, Train and Ambient Excitation
Ground borne environmental vibrations and the dynamic soil -structure interaction are closely related to the dynamic soil parameters at a site. There are a number of soil dynamic methods to determine the soil parameters from field tests. Some of these methods will be described and dem -onstrated for some sites. The material damping of the soil is evaluated from the attenuation of the wave amplitudes. The wave speed of the soil can be simply read from the time histories of a number of consecutive measuring points. The method can be improved by the correlation function between each two neighboured sensors. The completely different SASW method uses the phase of the cross power spectrum of two sensors and determines a dispersion curve. Regular phase spectra of a line of measuring points can also be used to get a dispersion curve. The multiple sensor MASW method is introduced as an alternative to the SASW method. A high number of regularly spaced sensor can be used to establish a frequency -wavenumber transform of the wave field which could show also the dis -persion curves of higher modes. A method has been tested which also uses the cross power spectrum of all pairs of sensors to establish a characteristic function which includes information about the wave velocities at low frequencies and which can work with ambient noise excitation (SPAC). Experiments with different sensor placements and different deterministic and stochastic excitations will be presented.
Lutz AUERSCH Samir SAID
BAM Federal Institute of Materials Research and Testing , 12200 Berlin, Germany
国际会议
5th International Symposium on Environmental Vibration(第五届环境振动国际研讨会)
成都
英文
3-9
2011-10-20（万方平台首次上网日期，不代表论文的发表时间）