TY - THES

T1 - Ground vibrations measurements during roadway drifting, propagation of ground vibrations and impact quantification in the surrounding rock mass of roadheader and drill & blast development

AU - Egger, Florian

N1 - embargoed until null

PY - 2007

Y1 - 2007

N2 - Mechanical excavation as well as excavation by drilling and blasting causes an impact of energy to the surrounding rock mass that generates ground vibrations. These vibrations are transmitted through the rock mass as seismic body and surface waves and may cause as a function of the distance damage to the surrounding rock mass. The three main objectives of the diploma thesis were the examination of ground vibration measurements, the development of a model for the propagation of ground vibrations and the development of a model to quantify the cumulative impact. More than 400 in situ measurements were performed in different underground mines and tunnel sites. Dimensional analysis and regression analysis were used to determine a propagation function for ground vibrations. The parameters with the strongest influence on the absorption factor were the rock mass rating, the density, the Youngs Modulus, the overburden and the frequency. To describe the impact of energy the factors energy consumption of the excavation method, radiated seismic energy, cumulated radiated seismic energy, seismic efficiency factor and the impact quantification number were considered. The estimation of the impact energy into the surrounding rock mass caused by the excavation method could be a substantial help for a better approximation of the degree of rock disintegration around roadways, since the impact energy may be one of the main parameters on the creation of the excavation damaged zone.

AB - Mechanical excavation as well as excavation by drilling and blasting causes an impact of energy to the surrounding rock mass that generates ground vibrations. These vibrations are transmitted through the rock mass as seismic body and surface waves and may cause as a function of the distance damage to the surrounding rock mass. The three main objectives of the diploma thesis were the examination of ground vibration measurements, the development of a model for the propagation of ground vibrations and the development of a model to quantify the cumulative impact. More than 400 in situ measurements were performed in different underground mines and tunnel sites. Dimensional analysis and regression analysis were used to determine a propagation function for ground vibrations. The parameters with the strongest influence on the absorption factor were the rock mass rating, the density, the Youngs Modulus, the overburden and the frequency. To describe the impact of energy the factors energy consumption of the excavation method, radiated seismic energy, cumulated radiated seismic energy, seismic efficiency factor and the impact quantification number were considered. The estimation of the impact energy into the surrounding rock mass caused by the excavation method could be a substantial help for a better approximation of the degree of rock disintegration around roadways, since the impact energy may be one of the main parameters on the creation of the excavation damaged zone.

KW - ground vibration

KW - seismic energy

KW - roadheader

KW - drill and blast

KW - geophone

KW - impact

KW - EDZ

KW - Erschütterung

KW - Seismik

KW - Geophon

KW - seismische Energie

KW - Teilschnittmaschine

KW - Bohren und Sprengen

KW - Streckenvortrieb

KW - EDZ

M3 - Diploma Thesis

ER -