Novel approach to evaluate rock mass fragmentation in block caving using unascertained measurement model and information entropy with flexible credible identification criterion

2021 ◽  
Author(s):  
Jian Zhou ◽  
Chao Chen ◽  
Manoj Khandelwal ◽  
Ming Tao ◽  
Chuanqi Li
Keyword(s):  
Rock Mass ◽  
Information Entropy ◽  
Measurement Model ◽  
Block Caving ◽  
Identification Criterion ◽  
Mass Fragmentation ◽  
Novel Approach

scholarly journals Observation of the rock slope thermal regime, coupled with crack meter stability monitoring

2021 ◽  
Author(s):  
Ondřej Racek ◽  
Jan Blahůt ◽  
Filip Hartvich
Keyword(s):  
Rock Mass ◽  
Monitoring System ◽  
Rock Slope ◽  
Global Radiation ◽  
Environmental Parameters ◽  
Radiation Balance ◽  
Rock Types ◽  
Novel Approach ◽  
First Results

Abstract. This article describes an innovative, complex and affordable monitoring system designed for joint observation of environmental parameters, rock block dilatations and temperature distribution inside the rock mass with a newly designed 3-meter borehole temperature sensor. Global radiation balance data are provided by pyranometers. The system introduces a novel approach for internal rock mass temperature measurement, which is crucial for the assessment of the changes in the stress field inside the rock slope influencing its stability. The innovative approach uses an almost identical monitoring system at different sites allowing easy setup, modularity and comparison of results. The components of the monitoring system are cheap, off-the-shelf and easy to replace. Using this newly designed system, we are currently monitoring three different sites, where the potential rock fall may endanger society assets below. The first results show differences between instrumented sites, although data time-series are relatively short. Temperature run inside the rock mass differs for each site significantly. This is very likely caused by different aspects of the rock slopes and different rock types. By further monitoring and data processing, using advanced modelling approaches, we expect to explain the differences among the sites, the influence of rock type, aspect and environmental variables on the long-term slope stability.

OBSIFRAC: database-supported software for 3D modeling of rock mass fragmentation

2003 ◽  
Vol 29 (2) ◽  
pp. 173-181 ◽  
Author(s):  
Luc Empereur-Mot ◽  
Thierry Villemin
Keyword(s):  
Rock Mass ◽  
3D Modeling ◽  
Mass Fragmentation

A fuzzy rock engineering system to assess rock mass cavability in block caving mines

2015 ◽  
Vol 27 (7) ◽  
pp. 2083-2094 ◽  
Author(s):  
R. Rafiee ◽  
Mohammad Ataei ◽  
Reza KhaloKakaie ◽  
S. M. E. Jalali ◽  
F. Sereshki
Keyword(s):  
Rock Mass ◽  
Engineering System ◽  
Block Caving ◽  
Rock Engineering ◽  
Rock Engineering System ◽  
Block Caving Mines

Integrating unascertained measurement and information entropy theory to assess blastability of rock mass

2012 ◽  
Vol 19 (7) ◽  
pp. 1953-1960 ◽  
Author(s):  
Jian Zhou ◽  
Xi-bing Li
Keyword(s):  
Rock Mass ◽  
Information Entropy ◽  
Entropy Theory

scholarly journals Enhancement of the technology of mining steep ore bodies applying the “floating” crown

2021 ◽  
Vol 280 ◽  
pp. 08013
Author(s):  
Serhii Pysmennyi ◽  
Serhii Chukharev ◽  
Kyelgyenbai Khavalbolot ◽  
Iryna Bondar ◽  
Jambaa Ijilmaa
Keyword(s):  
Rock Mass ◽  
Rock Pressure ◽  
Iron Content ◽  
Iron Ore ◽  
Underground Mines ◽  
Protective Structure ◽  
Unit Load ◽  
Block Caving ◽  
Crown Length ◽  
Ore Bodies

When mining ore bodies in Kryvyi Rih iron ore basin, underground mines apply open stoping or bulk caving systems in proportion of 55% to 45%. Most of underground mines prefer stoping with pillar caving. Yet, rock pressure contributes to growth of costs for workings maintenance and deterioration of extraction indices. Rock mass extraction indices can be enhanced by application of a protectve structure in the upper part of the block that will enable additional decrease in load on the draw level. There are a great many of methods for determining parameters of constructive elements of the protective structure that help keep its integrity for the whole period of block mining. The article suggests methods for determining parameters of the protective structure when mining steep ore bodies. The research conducted demonstrates that with the inclined protective structure, increase of unit load on it from 200 to 1200t/m2 leads to decrease of its thickness from 6.3-20.9m to 5.5-18.4m and increase of the crown length from 40m to 60m. The developed block caving system with application of the protective structure when mining steep ore bodies enables overall decrease of ore dilution in the block by 3%, increase of iron content in the mined ore by 1.3% without significant mining costs growth and decrease of loads on the workings of the receiving level.

Role of Rock Mass Fabric and Faulting in the Development of Block Caving Induced Surface Subsidence

2009 ◽  
Vol 43 (5) ◽  
pp. 533-556 ◽  
Author(s):  
Alexander Vyazmensky ◽  
Davide Elmo ◽  
Douglas Stead
Keyword(s):  
Rock Mass ◽  
Surface Subsidence ◽  
Block Caving

Evaluation of the Part of Blasting Energy Used for Rock Mass Fragmentation

Fragblast ◽  
2001 ◽  
Vol 5 (3) ◽  
pp. 180-193 ◽  
Author(s):  
E. Hamdi ◽  
J. du Mouza ◽  
J.A. Fleurisson
Keyword(s):  
Rock Mass ◽  
Mass Fragmentation
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