© copyright 2018 innovative mining products (pty) …...drop test facility for r&d limitation of...
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Increased agility for the research and development
of dynamic roof support products
Greig Knox&
Adrian Berghorst
© NCM 2018
© Copyright 2018 Innovative Mining Products (Pty) Ltd t/a New Concept Mining ("NCM"). All rights reserved. This document is confidential and may not be reproduced or shared without the express written permission of NCM.
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Agenda
• Dynamic Performance• Dynamic Test Methods• NCM DIT Overview & Instrumentation• Data Processing
© NCM 2018
PresenterPresentation NotesDynamic PerformanceExpected performance versus actual performance
Test MethodsTwo of the well known methods
Overview of the NCM DIT
Data Processing
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Requirement for Dynamic Testing
© NCM 2018
PresenterPresentation NotesIncrease in the depth of minesRock bursts – strain burstSeismicityDifference in performance Stiff BoltYielding BoltDynamic BoltDynamic Increase Factor Malvar and CrawfordFirst Dynamic TestSouth Africa Ortlepp & Stacey
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Requirement for Dynamic Testing
© NCM 2018
PresenterPresentation NotesIncrease in the depth of minesRock burstsSeismicityDifference in performance Stiff BoltYielding BoltDynamic BoltDynamic Increase Factor Malvar and CrawfordFirst Dynamic TestSouth Africa Ortlepp & Stacey
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Test Methodologies
© NCM 2018
PresenterPresentation NotesCanMETCanadianImpact test methodOriginally developed for testing landing gear on space shuttle
WASMAustralianMomentum transfer method Developed to be able to perform full system tests
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Drop Test Facility for R&D
© NCM 2018
PresenterPresentation NotesLimitation of Drop test method:Purely axial loading – No ShearNot a complete simulation of underground conditions
Advantages:Repeatable / consistentRelatively safeRelatively cost effective
Provides a platform on which revisions / products and be compared
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NCM DIT
© NCM 2018
PresenterPresentation NotesVideo overview of the NCM DIT
Sample loaded through the bore of the trolleyKnown mass raised to a known height Release of trolley potential energy converted to kinetic energy Impact – force and displacement result of work done to absorb the energy
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NCM DIT
• 65 kJ Energy (maximum)
• 551kg Weight (minimum)
• 3171kg Weight (maximum)
• 2.1m Drop Height (maximum)
• 6.4m/s Velocity at Impact (maximum)
• 3.5m Bolt Length (maximum)
© NCM 2018
PresenterPresentation NotesOverview of the system specification
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NCM DIT: Measurement Overview
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PresenterPresentation NotesTypical ResultImpact loadPlate load Proximal DisplacementDistal Displacement
Additional Load Cell Set frame load cell
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NCM DIT: Measurement OverviewLoad Cells
Line scan Cameras
User Interface & Report Generation
© NCM 2018
PresenterPresentation NotesOverview of outcome measurements – a large number of other sensors running to ensure health and safe operation of the machine
Piezoelectric load cells 3 setsLine scan camera’s used from displacement measurementAutomatic calculation of displacement measurementLighting requirement X axis displacement / Y axis time
Ability to automatically view data and generate reports
Importance of sample preparation
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NCM DIT: Data Processing
© NCM 2018
PresenterPresentation NotesIsolate Focus on the first impulse of multiple
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NCM DIT: Data Processing
215 Samples500 Drops
© NCM 2018
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Thank youQuestions ?
© NCM 2018
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ReferencesAnderson, B. V. (2015). Dynamic Behaviour of New Concept Mining PAR1 Bolt.Hadjigeorgiou, J., & Yves, P. (2011). A Critical Assessment of Dynamic Rock
Reinforcement and Support Testing Facilities. Rock mechanics and rock engineering 44, no. 5, 565-578.
Ortlepp, W. (1969). An Empirical Determination of the Effectiveness of RockboltSupport under Impulse Loading. Proceedings of the International Symposium on Large Permanent Underground Openings, (pp. 197-205). Oslo.
Villaescusa, E., Thompson, A., & Player, J. (2004). Dynamic Testing of Rock Reinforcement using the Momentum Transfer Method. Fifth International Sysmposium on Ground Support in Mining and Underground Construction, (pp. 237-339). Perth.
© NCM 2018
Slide Number 1AgendaRequirement for Dynamic TestingRequirement for Dynamic TestingTest MethodologiesDrop Test Facility for R&DNCM DITNCM DITNCM DIT: Measurement OverviewNCM DIT: Measurement OverviewNCM DIT: Data ProcessingNCM DIT: Data ProcessingThank you�Questions ?Slide Number 14
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