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RISS 인기검색어
- 검색키워드
- 저자 : ( Samuel U. Ejezie ) (검색결과 1 건)
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Propagation of Vibrations in Lateritic Soils of the Humid Tropical Region
Samuel U. Ejezie 한국지반공학회 2013 international journal of geo-engineering Vol.5 No.3
Ground movement triggered by dynamic loads has been investigated in South-eastern Nigeria, a typical area of the humid tropical region underlain by lateritic soils. The study was conducted using varying weights of dynamite charge (explosive) placed at varying distances and depths from a chosen monitoring station. The dynamite explosions triggered off transient-type ground motions. These were transmitted away from the shot points through the thick overburden. The attenuation of these vibrations in the overburden soil and surrounding earth materials was closely monitored. The results show that the vibration propagation is typified by a fairly high attenuation coefficient - evidenced by a rapid decrease in velocity amplitude with distance from the shot point. The bulk of the peak values of velocity amplitude recorded during the monitoring fell within the zone of structural safety when compared with internationally accepted damage criteria for vibrations. In terms of human response criteria, however, the peak values indicate that the vibration level would attract complaints from occupants of property located within 500 m from the shot point, particularly if the shooting was carried out in the vicinity of a built-up area. The findings have been used to formulate a preliminary configuration that could be adopted during activities which involve the artificial generation of ground motions and vibrations, particularly those associated with construction work, and the operation of seismic crews engaged in oil and gas exploration. Furthermore, the minimum safe shooting distances determined for various depth and charge combinations revealed that for a given weight of explosive it may be safer to shoot at a smaller than a greater depth.
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