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Behaviour of blast-induced damaged zone around underground excavations in hard rock mass
The presence of blast-induced damaged zone around an excavation boundary has been an important concern in rock construction. It is generally believed that the presence of this zone can pose problems related to stability and flow and consequently impair the performance and functionality of the excavation. In fact, the immediate consequences of this zone are usually conceived in terms of safety and cost. Hence, some organizations have put in place guidelines for controlling the amount of damage induced by blasting. Since shotcrete or sprayed concrete is a widely used surface rock support, its performance depends primarily on the competence of the damaged zone. However, in some instances the use of shotcrete may unnecessary, but the lack of knowledge of the competency of the damage zone means, it is better not to take chances. It is therefore necessary to increase the knowledge and the understanding of the competency and behaviour of the damaged zone in order to predict the performance and functionality of a rock tunnel. To gain an understanding of the damaged or disturbed zone in general, significant efforts have been made over the last few decades in a broader area; the excavation disturbed zone. These efforts mainly focused on the characterization and classification of the damaged zone. Quantification of this zone has also been done in terms of mechanical, hydraulic and physical parameters, particularly to delineate the extent of the damaged zone. The characterization, classification and quantification of damaged zone were purpose specific and therefore, the definitions for damage zone are different and varying. In this thesis the damaged zone is defined as the zone where the rock has been significantly damaged such that the mechanical properties have been affected and that these changes are measurable by any state of the art measurement techniques. This definition also applies to the blast-induced damage zone. To be able to assess the significance of the blast-induced damage zone and its influence on the ...
Behaviour of blast-induced damaged zone around underground excavations in hard rock mass
The presence of blast-induced damaged zone around an excavation boundary has been an important concern in rock construction. It is generally believed that the presence of this zone can pose problems related to stability and flow and consequently impair the performance and functionality of the excavation. In fact, the immediate consequences of this zone are usually conceived in terms of safety and cost. Hence, some organizations have put in place guidelines for controlling the amount of damage induced by blasting. Since shotcrete or sprayed concrete is a widely used surface rock support, its performance depends primarily on the competence of the damaged zone. However, in some instances the use of shotcrete may unnecessary, but the lack of knowledge of the competency of the damage zone means, it is better not to take chances. It is therefore necessary to increase the knowledge and the understanding of the competency and behaviour of the damaged zone in order to predict the performance and functionality of a rock tunnel. To gain an understanding of the damaged or disturbed zone in general, significant efforts have been made over the last few decades in a broader area; the excavation disturbed zone. These efforts mainly focused on the characterization and classification of the damaged zone. Quantification of this zone has also been done in terms of mechanical, hydraulic and physical parameters, particularly to delineate the extent of the damaged zone. The characterization, classification and quantification of damaged zone were purpose specific and therefore, the definitions for damage zone are different and varying. In this thesis the damaged zone is defined as the zone where the rock has been significantly damaged such that the mechanical properties have been affected and that these changes are measurable by any state of the art measurement techniques. This definition also applies to the blast-induced damage zone. To be able to assess the significance of the blast-induced damage zone and its influence on the ...
Behaviour of blast-induced damaged zone around underground excavations in hard rock mass
Saiang, David (Autor:in)
01.01.2008
2008:60
Hochschulschrift
Elektronische Ressource
Englisch
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