Numerical modeling of blast-induced rock fragmentation in deep mining with 3D and 2D FEM method approaches  

作　　者：Michał Kucewicz Mazurkiewicz Łukasz Paweł Baranowski Jerzy Małachowski Krzysztof Fuławka Piotr Mertuszka Marcin Szumny 

机构地区：[1]Military University of Technology,Faculty of Mechanical Engineering,Institute of Mechanics and Computational Engineering,2 Gen.S.Kaliskiego Street,00-908,Warsaw,Poland [2]KGHM CUPRUM Ltd.,Research and Development Center,2-8 Sikorskiego Street,53-659,Wrocław,Poland

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2024年第11期4532-4553,共22页岩石力学与岩土工程学报（英文）

摘　　要：To optimize the excavation of rock using underground blasting techniques,a reliable and simplified approach for modeling rock fragmentation is desired.This paper presents a multistep experimentalnumerical methodology for simplifying the three-dimensional(3D)to two-dimensional(2D)quasiplane-strain problem and reducing computational costs by more than 100-fold.First,in situ tests were conducted involving single-hole and free-face blasting of a dolomite rock mass in a 1050-m-deep mine.The results were validated by laser scanning.The craters were then compared with four analytical models to calculate the radius of the crushing zone.Next,a full 3D model for single-hole blasting was prepared and validated by simulating the crack length and the radius of the crushing zone.Based on the stable crack propagation zones observed in the 3D model and experiments,a 2D model was prepared.The properties of the high explosive(HE)were slightly reduced to match the shape and number of radial cracks and crushing zone radius between the 3D and 2D models.The final methodology was used to reproduce various cut-hole blasting scenarios and observe the effects of residual cracks in the rock mass on further fragmentation.The presence of preexisting cracks was found to be crucial for fragmentation,particularly when the borehole was situated near a free rock face.Finally,an optimization study was performed to determine the possibility of losing rock continuity at different positions within the well in relation to the free rock face.

关 键 词：Dolomite rock Two-dimensional(2D)rock modeling Rock fragmentation Cut-hole blasting 

分 类 号：TU45[建筑科学—岩土工程]