Abstract
The degree of induced fracturing related to bench blasting has been investigated in the Offerdal Nappe in the Landogssjo area, in the county of Jamtland, Sweden where the dimension stone "Flammet Quartzite" is quarried. Two fracture trace maps have been compiled; one from an area within the quarry, where natural and induced fracturing are analysed, and a second from an area where no quarrying has taken place, i.e. where only natural fractures appear. This means that it is possible to take into account differences between natural fractures and induced fractures. The fracture system has been described in the investigated areas according to fracture set orientation, size, frequency and occurrence. Two types of fracture occurrence related to blasting have been defined: (1) coalescing fractures with at least one end terminating in a drill hole (type A), and (2) coalescing fractures with one end terminating in a type A fracture (type B). Fractures of type A increase the fracture frequency by up to 23%. Considering fractures of type A and B together, an increase of up to 36% has been noted. In this investigation, approximately 17% of the rock volume shows increased fracturing from the blasting operation.
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