Modelling of Blast-Induced Stress Wave Propagation and Fracturing in Hard Rock Material

CIM Vancouver 2002
Ali Mortazavi, Mario Paventi, Richard Brummer, Bibhu Mohanty,
Abstract ABSTRACT:
In underground mining applications, successful blasting results in less damage, which may lower support costs, reduce dilution and produce more uniform fragmentation. The explosive detonation process creates a pressure front that propagates a stress wave into the surrounding rock mass at a very high speed. The produced stress wave can induce varying degrees of damage, depending on rock strength and physical properties, to the excavated area.

This paper presents a summary of a research work, which was conducted to investigate the propagation of explosive-induced stress waves in hard rock media and delve into the mechanism of rock damage and fracturing due to the wave action. The primary objective of this work is to numerically simulate the experimental study of blast-induced rock fracturing conducted by INCO Limited, Mines Research department. ITASCA’s discontinuum code UDEC (Universal Distinct Element Code), was used to simulate the blasting experiments. In brief, the focal point of the paper can be summarized as follows:

· Investigate the size of the stress-wave-induced fractured zone around the blasthole,
· Examine the extent and direction of the radial fractures that form outside the blasthole, and
· Explore the mechanisms that cause the rock breakage (i.e. the role of stress wave versus explosion gas pressure)
Keywords: Blast Mdelling, Rock properties, Explosive-induced stress waves, Blasting, Stress wave, Radial fractures, Damage, Rock breakage, Blast induced fractures, Fractured zone
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