ICGCM Papers:
Support Performance Assessments
 
 
Potential Application of Short Encapsulation Pull Test (Sept) Data to Project Relative Roof Control Risk
35th International Conference on Ground Control in Mining
Potential Application of Short Encapsulation Pull Test (Sept) Data to Project Relative Roof Control Risk
by
Jason E Tinsley, Minova, Georgetown, United StatesYoginder Paul Chugh, Southern Illinois University, Carbondale, United States
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[Conference] 35th International Conference on Ground Control in Mining
[Price] Free  [Comments] 0
[Topical Area] Support Performance Assessments
[Author] Jason E Tinsley, Minova, Georgetown, United StatesYoginder Paul Chugh, Southern Illinois University, Carbondale, United States
[Abstract] 
Key Conclusions:
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The conclusions of this paper will be final graphical outputs that will be available for industry ground control professionals to use to compare their roof support systems with those of other operations on the basis of SEPT stiffness, and its definition of the roof strata ability to translate load from the roof support systems.
Key Findings:
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The correlation between the stiffness values of SEPT tests and the roof support required shall be evaluated in two ways. The first will be defining the cost of roof support per foot of face advance mined. This would provide a tool for new mining operations to reference when completing initial testing to help with project costs and future budgeting. The dynamic nature of steel markets, in conjunction with widely varying costs when evaluating passive against active systems would require a degree of forecasting and updating to keep this model current. Therefore, a second evaluation will be made using system capacity per square foot mined (tons/ft2). This would be geared toward ground control engineers to evaluate their potential risk in the form of a safety factor relative to existing operations given their current roof strata’s ability to accept load from the roof supports.
Objective of the Paper:
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Over the last 10 years a considerable database of SEPT data has been compiled that is now ready for analysis to see if practical guidelines can be established as a result of this testing. In “An Analysis of Short Encapsulation Bolt Pull Test (SEPT) Data From Interior Basin Coal Mines” Chugh, et al., 2015 define an Anchorage Stiffness at 50% of the peak load value (AS-50) which helps to evaluate how much the roof supports displace during the test instead of looking at only the peak load test value. This paper evaluates the correlation of this AS-50 value with required roof support when beam building is the primary method of support. The current regulatory practices do not allow mines to have a significant number of roof falls without requiring plan changes to protect the safety of the miners. As a result the current practices should closely match what would be required, at a minimum, to adequately support the strata. Alternately, it is possible that mines may be over supporting areas due to strata changes, which is also be defined in this paper.
Problem Statement:
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It is difficult to compare support systems between mining operations and predict roof control costs that should be expected given changing roof conditions, or conditions at new operations.