INFLUENCE OF ROCK PRESSURE ON SPECTRAL COMPOSITION OF PENDULUM WAVES IN BLOCK- STRUCTURED MEDIA UNDER PULSED LOADING
E. N. Sher, A. G. Chernikov
Chinakal Institute of Mining, Siberian Branch Russian Academy of Sciences, Novosibirsk, Russia
Keywords: Блочные горные породы, горное давление, сейсмические волны, импульсное нагружение, экспериментальное моделирование, маятниковая волна, скорость волны, спектр, Block rocks, rock pressure, seismic waves, pulsed loading, experimental modeling, pendulum wave, wave speed, spectrum
Abstract
Effects of external compression on the parameters of seismic waves in rock mass were investigated. The study was carried out experimentally on one-dimensional models of block-structured media under pulsed loading. It is shown that as a result of dispersion prompted by propagation of perturbations, a low-frequency pendulum wave is observed in its head part. The parameters of such wave are determined by the mass of blocks and deformability of contact zones at their interfaces. External compression enhances the rigidity of such zones thereby causing acceleration in the wave propagation speed and a change in the spectral composition of waves. A possibility of determining external compression by the spectral composition parameters of pendulum waves was investigated in the model experiments.
|
