Assessing longwall support-roof interaction from shield leg pressure data

Trueman, R., Lyman, G. J., Callan, M. A. and Robertson, B. (2005) Assessing longwall support-roof interaction from shield leg pressure data. Mining Technology. Transactions of the Institutions of Mining and Metallurgy: Section A, 114 3: 176-184. doi:10.1179/037178405X53953


Author Trueman, R.
Lyman, G. J.
Callan, M. A.
Robertson, B.
Title Assessing longwall support-roof interaction from shield leg pressure data
Journal name Mining Technology. Transactions of the Institutions of Mining and Metallurgy: Section A   Check publisher's open access policy
ISSN 0371-7844
1474-9009
1743-2863
Publication date 2005-01-01
Sub-type Article (original research)
DOI 10.1179/037178405X53953
Volume 114
Issue 3
Start page 176
End page 184
Total pages 9
Editor Peter A. Dowd
Place of publication London, U.K.
Publisher Maney Publishing
Language eng
Subject C1
290701 Mining Engineering
640200 Primary Mining and Extraction Processes
Abstract A concept has been developed where characteristic load cycles of longwall shields can describe most of the interaction between a longwall support and the roof. A characteristic load cycle is the change in support pressure with time from setting the support against the roof to the next release and movement of the support. The concept has been validated through the back-analysis of more than 500 000 individual load cycles in five longwall panels at four mines and seven geotechnical domains. The validation process depended upon the development of new software capable of both handling the large quantity of data emanating from a modern longwall and accurately delineating load cycles. Existing software was found not to be capable of delineating load cycles to a sufficient accuracy. Load-cycle analysis can now be used quantitatively to assess the adequacy of support capacity and the appropriateness of set pressure for the conditions under which a longwall is being operated. When linked to a description of geotechnical conditions, this has allowed the development of a database for support selection for greenfield sites. For existing sites, the load-cycle characteristic concept allows for a diagnosis of strata-support problem areas, enabling changes to be made to set pressure and mining strategies to manage better, or avoid, strata control problems. With further development of the software, there is the prospect of developing a system that is able to respond to changes in strata-support interaction in real time.
Keyword Longwall shields
Simulation
Coal production
Load-cycle analysis
Strata-support
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

 
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Created: Wed, 15 Aug 2007, 16:33:33 EST