ABSTRACT

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 measurements 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 was larger in the direction of the maximum load. Some parts of the blastholes remain following blasting. The author proposes a method how to infer the in-situ stresses from the damage zones around the blastholes in this article and it 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 other indirect techniques. The inferences are compared with measurements and the validity of the method are discussed in view of the measurements or inferences from other methods.

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