A feasibility study on confinement effect on blasting performance in narrow vein mining through numerical modelling

Long An, Fidelis T. Suorineni, Shuai Xu, Yuan Hui Li, Zhe Chao Wang

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Due to the limited free face in narrow-vein stoping, blasting is usually subjected to excessive confinement effect that often result in difficulties in ore loss and dilution. The aim of this study is to analyze the blasting confinement mechanism in narrow-vein mining, and to quantitatively define the confinement effect. The PFC and LS-DYNA numerical modelling programs are combined to investigate the effect of blasting-induced stress waves and detonation gas effects. A confinement coefficient in narrow-vein mining is introduced and defined as the ratio of the blasting crater volume or area formed in an infinite free face to that in a confined face. The blasting confinement coefficient is used to rate the confinement severity. On this basis, the effects of minable width and burden on the confinement coefficient are analyzed. The numerical simulation results indicate that the confinement coefficient decreases with increasing minable width for a given burden. The relationship between the minable width and the confinement coefficient can be described by a first-order exponential decay function. For a given minable width, the confinement coefficient increases with increasing burden. The relationship between the burden and the confinement coefficient can be expressed by a first-order exponential growth function. Based on the numerical modelling results, a design chart for the blasting confinement effect in narrow-vein mining is introduced as a guide for preliminary design of narrow vein blasting to optimize production by reducing overbreak (dilution) and underbreak (ore loss).

Original languageEnglish
Pages (from-to)84-94
Number of pages11
JournalInternational Journal of Rock Mechanics and Mining Sciences
Volume112
DOIs
Publication statusPublished - Dec 1 2018

Fingerprint

Blasting
feasibility study
blasting
modeling
Ores
Dilution
dilution
overbreak
Stoping
stoping
Detonation
effect
crater
Computer simulation
Gases
gas
simulation

Keywords

  • Blast crater
  • Blasting confinement effect
  • Design chart
  • Narrow-vein
  • Numerical modelling

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

Cite this

A feasibility study on confinement effect on blasting performance in narrow vein mining through numerical modelling. / An, Long; Suorineni, Fidelis T.; Xu, Shuai; Li, Yuan Hui; Wang, Zhe Chao.

In: International Journal of Rock Mechanics and Mining Sciences, Vol. 112, 01.12.2018, p. 84-94.

Research output: Contribution to journalArticle

@article{e5a2fb4df57740cab54fbeeeca64ee9c,
title = "A feasibility study on confinement effect on blasting performance in narrow vein mining through numerical modelling",
abstract = "Due to the limited free face in narrow-vein stoping, blasting is usually subjected to excessive confinement effect that often result in difficulties in ore loss and dilution. The aim of this study is to analyze the blasting confinement mechanism in narrow-vein mining, and to quantitatively define the confinement effect. The PFC and LS-DYNA numerical modelling programs are combined to investigate the effect of blasting-induced stress waves and detonation gas effects. A confinement coefficient in narrow-vein mining is introduced and defined as the ratio of the blasting crater volume or area formed in an infinite free face to that in a confined face. The blasting confinement coefficient is used to rate the confinement severity. On this basis, the effects of minable width and burden on the confinement coefficient are analyzed. The numerical simulation results indicate that the confinement coefficient decreases with increasing minable width for a given burden. The relationship between the minable width and the confinement coefficient can be described by a first-order exponential decay function. For a given minable width, the confinement coefficient increases with increasing burden. The relationship between the burden and the confinement coefficient can be expressed by a first-order exponential growth function. Based on the numerical modelling results, a design chart for the blasting confinement effect in narrow-vein mining is introduced as a guide for preliminary design of narrow vein blasting to optimize production by reducing overbreak (dilution) and underbreak (ore loss).",
keywords = "Blast crater, Blasting confinement effect, Design chart, Narrow-vein, Numerical modelling",
author = "Long An and Suorineni, {Fidelis T.} and Shuai Xu and Li, {Yuan Hui} and Wang, {Zhe Chao}",
year = "2018",
month = "12",
day = "1",
doi = "10.1016/j.ijrmms.2018.10.010",
language = "English",
volume = "112",
pages = "84--94",
journal = "International Journal of Rock Mechanics and Minings Sciences",
issn = "1365-1609",
publisher = "Elsevier",

}

TY - JOUR

T1 - A feasibility study on confinement effect on blasting performance in narrow vein mining through numerical modelling

AU - An, Long

AU - Suorineni, Fidelis T.

AU - Xu, Shuai

AU - Li, Yuan Hui

AU - Wang, Zhe Chao

PY - 2018/12/1

Y1 - 2018/12/1

N2 - Due to the limited free face in narrow-vein stoping, blasting is usually subjected to excessive confinement effect that often result in difficulties in ore loss and dilution. The aim of this study is to analyze the blasting confinement mechanism in narrow-vein mining, and to quantitatively define the confinement effect. The PFC and LS-DYNA numerical modelling programs are combined to investigate the effect of blasting-induced stress waves and detonation gas effects. A confinement coefficient in narrow-vein mining is introduced and defined as the ratio of the blasting crater volume or area formed in an infinite free face to that in a confined face. The blasting confinement coefficient is used to rate the confinement severity. On this basis, the effects of minable width and burden on the confinement coefficient are analyzed. The numerical simulation results indicate that the confinement coefficient decreases with increasing minable width for a given burden. The relationship between the minable width and the confinement coefficient can be described by a first-order exponential decay function. For a given minable width, the confinement coefficient increases with increasing burden. The relationship between the burden and the confinement coefficient can be expressed by a first-order exponential growth function. Based on the numerical modelling results, a design chart for the blasting confinement effect in narrow-vein mining is introduced as a guide for preliminary design of narrow vein blasting to optimize production by reducing overbreak (dilution) and underbreak (ore loss).

AB - Due to the limited free face in narrow-vein stoping, blasting is usually subjected to excessive confinement effect that often result in difficulties in ore loss and dilution. The aim of this study is to analyze the blasting confinement mechanism in narrow-vein mining, and to quantitatively define the confinement effect. The PFC and LS-DYNA numerical modelling programs are combined to investigate the effect of blasting-induced stress waves and detonation gas effects. A confinement coefficient in narrow-vein mining is introduced and defined as the ratio of the blasting crater volume or area formed in an infinite free face to that in a confined face. The blasting confinement coefficient is used to rate the confinement severity. On this basis, the effects of minable width and burden on the confinement coefficient are analyzed. The numerical simulation results indicate that the confinement coefficient decreases with increasing minable width for a given burden. The relationship between the minable width and the confinement coefficient can be described by a first-order exponential decay function. For a given minable width, the confinement coefficient increases with increasing burden. The relationship between the burden and the confinement coefficient can be expressed by a first-order exponential growth function. Based on the numerical modelling results, a design chart for the blasting confinement effect in narrow-vein mining is introduced as a guide for preliminary design of narrow vein blasting to optimize production by reducing overbreak (dilution) and underbreak (ore loss).

KW - Blast crater

KW - Blasting confinement effect

KW - Design chart

KW - Narrow-vein

KW - Numerical modelling

UR - http://www.scopus.com/inward/record.url?scp=85055348920&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85055348920&partnerID=8YFLogxK

U2 - 10.1016/j.ijrmms.2018.10.010

DO - 10.1016/j.ijrmms.2018.10.010

M3 - Article

AN - SCOPUS:85055348920

VL - 112

SP - 84

EP - 94

JO - International Journal of Rock Mechanics and Minings Sciences

JF - International Journal of Rock Mechanics and Minings Sciences

SN - 1365-1609

ER -