Impact of impactor shape and dimensions on dynamic rock fracture performance

Abstract

The selection of effective methods and tools for the destruction of rocks, especially those of medium and high strength, is one of the main objectives of scientific research both in Russia and abroad. The static method of rock destruction using the cutting principle often proves to be unproductive and insufficiently effective due to the limited power of the equipment used and the rapid failure of the cutting tool. On the other hand, the impact method, characterized by very large forces developed on the executive organs of mining machines over short periods of time, ensures significantly better results. In this regard, experimental studies were conducted with the primary goal of determining the influence of the shape and size of working tools on the indicators of dynamic rock destruction, including the effect of the ratio of diameter to length of the strikers at certain constant values of mass and radii of rounding of their ends, which determine compliance, on specific energy consumption during destruction. Additionally, investigations were carried out to establish the effectiveness of applying variable cross-section strikers under different types and forms of generated stress pulses, the results of which are described in the proposed article.

Keywords

• impact load
• rock
• rock properties
• drilling
• test method
• bit
• drilling speed
• fracture resistance