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  • Author: Iwona Stan-Kłeczek x
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Aleksander Brom and Iwona Stan-Kłeczek

Abstract

The pyrotechnic materials are one of the types of the explosives materials which produce thermal, luminous or sound effects, gas, smoke and their combination as a result of a self-sustaining chemical reaction. Therefore, pyrotechnics can be used as a seismic source that is designed to release accumulated energy in a form of seismic wave recorded by tremor sensors (geophones) after its passage through the rock mass. The aim of this paper was to determine the utility of pyrotechnics for shallow seismic engineering. The work presented comparing the conventional method of seismic wave excitation for seismic refraction method like plate and hammer and activating of firecrackers on the surface. The energy released by various sources and frequency spectra was compared for the two types of sources. The obtained results did not determine which sources gave the better results but showed very interesting aspects of using pyrotechnics in seismic measurements for example the use of pyrotechnic materials in MASW.

Open access

Sandra Herber and Iwona Stan-Kłeczek

Abstract

The aim of the investigation was to study the elastic properties and chemical composition of rock samples based on laboratory measurements. Three cuboid samples of diabase, granite and quartz were tested under laboratory conditions. The shape of samples is a cuboid with dimensions 0.1 × 0.05 × 0.05 m and the measurements were made in three directions. The Pundit Lab+ equipment was used for tests. The signal frequency value was 250 kHz. The propagation times of P- and S-waves were designated that allows to determine the elastic dynamic moduli values. The Japanese JEOL USA Scanning Electron Microscope was also used for tests. The chemical composition of rocks were determined by characteristic X-rays analysis. Obtained results show that the ultrasonic measurements and SEM are useful tools to assign properties of rocks. This knowledge makes easier recognition in preliminary stages during engineering study.