Abstract
This paper describes newly developed measurement techniques of the three-dimensional (3D) behavior of an actual ballast stone.A field experiment was performed on a railway line using aspecial ballast sensing stone with piezoresistive triaxial accelerating sensors for measurement.Two accelerometer chips are embedded in a crushed stone separately. The average value of the two acceleration measurement values indicates the to acceleration;the difference of the two acceleration measurement values yields off the rotational acceleration. The ballast grain receives an impact load imparted by a running train and generates a high-frequency translational motion together with the high-frequency rotational motion.We recordeda large amplitude signal immediately after loading;the high frequency of several hundred Hertz was rapidly attenuated. Regarding the reproducibility of high damping performance, this paper also proposed techniques for parameter determinationin the dynamic discontinuous deformation analysis based on the results of a field measurement experiment on an actual railway track.
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