A Further Study on the Mechanism of Pre-Splitting in Mining Engineering

Abstract

In this paper, the mechanism of pre-splitting was analysed using both theoretical and numerical methods. An analytical approach was derived based on the thick-wall cylinder theory. Numerical simulation of pre-split blasting of a two adjacent blast-hole bench was conducted using FLAC3Dsoftware. The sequential loading stages of explosive and stress wave were simplified to a triangular shape pulse and applied to the inner wall of blast-holes. Blast wave fronts and plastic zones were monitored in different elapsed times after detonation. Numerical findings show that collision between the two adjacent stress waves induces a tensile wave, playing the key role in pre-splitting.

Research on Effects of Blast Casting Vibration and Vibration Absorption of Presplitting Blasting in Open Cast Mine

“…Zou studied the vibration reduction result of presplit blasting with in situ investigation and figured out that the closer the presplit crack was, the better the vibration reduction results were obtained [15]. Salmi and Hosseinzadeh analyzed the mechanism of presplit blasting with the help of numerical simulation and determined that tensile stress waves induced by the denotation of two adjacent blast holes are the primary cause of presplit cracks [16]. Yang launched tests on trial blast holes with cross hole method and ultrasonic waves and established that presplit blasting might cause less damage to the rock mass in the slope than loosening blasting [17].…”