Determination of the natural stress state in a Brazilian rock mass by back analysing excavation measurements: a case study

2002 ◽  
Vol 39 (8) ◽  
pp. 1005-1032 ◽  
Author(s):  
J.A. de Mello Franco ◽  
J.L. Armelin ◽  
J.A.F. Santiago ◽  
J.C.F. Telles ◽  
W.J. Mansur
Keyword(s):  
Rock Mass ◽  
Stress State ◽  
Natural Stress

scholarly journals Management of geomechanical processes - the basis for selecting the optimal technologies for the development of mineral deposits

2018 ◽  
Vol 56 ◽  
pp. 02005
Author(s):  
Anatolii Kozyrev ◽  
Iuliia Fedotova ◽  
Eduard Kasparyan
Keyword(s):  
Rock Mass ◽  
Stress State ◽  
Rock Massif ◽  
Mineral Deposits ◽  
Mining Operations ◽  
Mining Technology ◽  
Geomechanical Monitoring ◽  
Gas Dynamic ◽  
Natural Stress ◽  
Mining Methods

When carrying out mining operations, a rock massif responds to technological impacts in the form of developing strains and fractures. Under certain conditions, this response occurs as dynamic and gas dynamic destructions of rocks with intensive release of energy, which creates threats to security and disrupts a working technology. To substantiate the optimal mining technology, which would be maximum adequate to the specific geological and geomechanical conditions of a deposit development, it is necessary to organize a comprehensive monitoring of geomechanical processes in rock massifs. The paper considers general principles to organize the geomechanical monitoring under conditions of the hierarchically-blocked rock massifs in the gravitational-tectonic field of the natural stress state. The authors give main recommendations for managing geomechanical processes in the rock mass for various mining methods.

Numerical investigation of the geomechanical response of adjacent backfilled stopes

2015 ◽  
Vol 52 (10) ◽  
pp. 1507-1525 ◽  
Author(s):  
Nooshin Falaknaz ◽  
Michel Aubertin ◽  
Li Li
Keyword(s):  
Rock Mass ◽  
Stress State ◽  
Friction Angle ◽  
Critical Issue ◽  
Surrounding Rock ◽  
Filling Sequence ◽  
Natural Stress ◽  
Simulation Results ◽  
Backfill Strength ◽  
Backfilled Stopes

Backfilling of mine stopes helps provide a safe workplace underground. The interaction between the backfill and surrounding rock mass has to be evaluated to ensure the secure application of backfill. This critical issue has led to much research on the stress state in single (isolated) backfilled stopes. However, the stress distribution in multiple openings that interact with each other has not yet been investigated as thoroughly. In this paper, the authors are using numerical simulations to evaluate the response of two adjacent backfilled stopes created in sequence, with a new assumption that is based on an explicit relationship between Poisson’s ratio and the internal friction angle of the backfill; as shown here, the use of this relationship can significantly modify the stress state in backfilled stopes. The simulation results, presented in terms of stresses, displacements, and strains, illustrate the influence of different parameters including backfill strength, pillar width, stope depth, rock mass stiffness, natural stress state, and excavation and filling sequence. Complementary aspects are also considered. A discussion follows on some of the characteristics and limitations of this investigation.

scholarly journals Determination of Stress State in Rock Mass Using Strain Gauge Probes CCBO

2016 ◽  
Vol 149 ◽  
pp. 544-552 ◽  
Author(s):  
Waclawik Petr ◽  
Stas Lubomir ◽  
Nemcik Jan ◽  
Konicek Petr ◽  
Kalab Tomas
Keyword(s):  
Rock Mass ◽  
Stress State ◽  
Strain Gauge

scholarly journals Determination of stress state in deep subsea formation by combination of hydraulic fracturing in situ test and core analysis: A case study in the IODP Expedition 319

2013 ◽  
Vol 118 (3) ◽  
pp. 1203-1215 ◽  
Author(s):  
Takatoshi Ito ◽  
Akio Funato ◽  
Weiren Lin ◽  
Mai-Linh Doan ◽  
David F. Boutt ◽  
...  
Keyword(s):  
Stress State ◽  
Hydraulic Fracturing ◽  
Core Analysis ◽  
In Situ Test

Determination of the stress state in a rock mass subjected to excavation

2010 ◽  
Vol 70 (2) ◽  
pp. 243-253 ◽  
Author(s):  
M. I. Álvarez-Fernández ◽  
C. González-Nicieza ◽  
A. Argüelles ◽  
A. E. Álvarez-Vigil
Keyword(s):  
Rock Mass ◽  
Stress State

scholarly journals EXPERIMENTAL DETERMINATION OF STRESS PARAMETERS IN THE MINING FIELD

2021 ◽  
Vol 2 (4) ◽  
pp. 123-129
Author(s):  
Alexander A. Skulkin
Keyword(s):  
Rock Mass ◽  
Stress State ◽  
Stress Concentration ◽  
Iron Ore ◽  
Ore Deposit ◽  
Measuring Station ◽  
Induced Field ◽  
Iron Ore Deposit ◽  
Stress Parameters

The experience of measuring the stress state of the rock mass at the Tashtagol iron ore deposit and the result of stresses acting in the induced field in the vicinity of 10 orts at a depth of 800 m from the daily surface (horizon -350) is presented using the method of measuring hydraulic fracturing. Stress concentration zones around the mine are determined at the measuring station.

A novel method for the determination of linting propensity of paper

TAPPI Journal ◽  
2012 ◽  
Vol 11 (10) ◽  
pp. 9-17
Author(s):  
ALESSANDRA GERLI ◽  
LEENDERT C. EIGENBROOD
Keyword(s):  
Ash Content ◽  
The Novel ◽  
Offset Printing ◽  
Excellent Correlation ◽  
End Conditions ◽  
Bottom Side ◽  
Novel Method ◽  
Total Fraction

A novel method was developed for the determination of linting propensity of paper based on printing with an IGT printability tester and image analysis of the printed strips. On average, the total fraction of the surface removed as lint during printing is 0.01%-0.1%. This value is lower than those reported in most laboratory printing tests, and more representative of commercial offset printing applications. Newsprint paper produced on a roll/blade former machine was evaluated for linting propensity using the novel method and also printed on a commercial coldset offset press. Laboratory and commercial printing results matched well, showing that linting was higher for the bottom side of paper than for the top side, and that linting could be reduced on both sides by application of a dry-strength additive. In a second case study, varying wet-end conditions were used on a hybrid former machine to produce four paper reels, with the goal of matching the low linting propensity of the paper produced on a machine with gap former configuration. We found that the retention program, by improving fiber fines retention, substantially reduced the linting propensity of the paper produced on the hybrid former machine. The papers were also printed on a commercial coldset offset press. An excellent correlation was found between the total lint area removed from the bottom side of the paper samples during laboratory printing and lint collected on halftone areas of the first upper printing unit after 45000 copies. Finally, the method was applied to determine the linting propensity of highly filled supercalendered paper produced on a hybrid former machine. In this case, the linting propensity of the bottom side of paper correlated with its ash content.

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