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.
|Translated title of the contribution||Erschütterungsmessungen während des Streckenvortriebs unter Tage, Ausbreitung von Erschütterungen und Quantifizierung des Energieeintrages in das umgebende Gebirge durch Teilschnittmaschinenvortrieb und Bohr- und Sprengvortrieb|
|Award date||29 Jun 2007|
|Publication status||Published - 2007|
Bibliographical noteembargoed until null
- ground vibration
- seismic energy
- drill and blast