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In situ stress inference from damage around blasted holes
O¨mer Aydan 한국자원공학회 2013 Geosystem engineering Vol.16 No.1
In situ stresses are one of the most important elements for the design and stability assessment of rock engineering structures and earthquake science. Many in situ stress inference and measurement techniques are devised, and they are broadly classified into direct or indirect techniques. Drilling and blasting technique is widely used as an excavation technique in rock engineering practice. The experiments on specimens clearly indicated that the fracture zones around the blasthole were larger in the direction of the maximum load. Some parts of the blastholes remain following blasting. In this study, a method how to infer the in situ stresses from the damage zones around the blastholes is proposed. The method is named as the blasthole-damage method. The fundamentals of this method are described and it is applied to several sites where in situ stress states are obtained by using direct or indirect techniques. The inferences are compared with measurements, and the validity of the method is discussed in view of the measurements or inferences from other methods. It is found that the method proposed can serve as a guideline to infer the stress state around rock excavations using the damage zone around blastholes as the drill/blast technique is commonly used in rock excavations.
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