The NIOSH Shield Hydraulics Inspection and Evaluation of Leg Data (Shield) Computer Program

Barczak, Thomas
Organization: International Conference on Ground Control in Mining
Pages: 12
Publication Date: Jan 1, 2002
Longwall shields provide essential ground control in Iongwall mining, yet a high percentage of shields are operating at less than peak capacity and many at well below the rated support capacity due to defective hydraulic cylinders or malfunctions in other hydraulic components. Leg pressure data are currently collected on state-of┬Čthe-art longwall shields, but typically are not analyzed to evaluate shield performance. The National Institute for Occupational Safety and Health (NIOSH) Shield Hydraulics Inspection and Evaluation of Leg Data (SHIELD) program is a Visual Basic software system that is designed to analyze leg pressure data and identify shields that are not performing to rated specifications. The program analysis is configured to detect the following conditions: (I ) loss of leg pressure, (2) imbalance in leg pressure, (3) low set pressure, (4) low yield pressure, and (5) full extension of the bottom stage. Other performance assessment measures include the percentage of the support capacity utilized (ratio of peak load to yield load), the percent of time that a shield operates at yield load, the ratio of the set load to the yield load, and the amount of support capacity that is lost due to leaking cylinders. Historical record keeping will allow the user to select a particular shield and review the performance record as developed by the program for that shield. In addition to these performance assessment measures, the software will include an animated description of shield hydraulic systems that will describe the operation and significance of each hydraulic component and the impact of component failures on the shield's capability to provide the required roof support. A general overview of the SHIELD program is provided in the paper together with an example analysis of a 2.5-year-old Australian longwall face.
Full Article Download:
(3548 kb)


Additional chapters/articles from the SME-ICGCM book Proceedings 21st International Conference on Ground Control in Mining

Pre-Driven Experimental Longwall Recovery Room Under Weak Ro
Longwall Mining-Induced Abutment Loads and Their Impacts on
Influence of Structural Stress Concentration and Structural
The NIOSH Shield Hydraulics Inspection and Evaluation of Leg
Study on Top-Coal Loss and the Optimum Drawing Interval of L
Stress Measurements for Safety Decisions in Longwall Coal
Re-Use of Rectangular Bolted Roadways in a Cover Depth > 100
Numerical Modeling of the Gob Loading Mechanism in Longwall
Deep Cover Pillar Extraction in the U.S. Coalfields
Evaluation of Pillar Recovery in Southern West Virginia
A Case History Investigation of Two Coal Bumps in the Southe
A Linear Coal Pillar Strength Formula for South African Coal
Anchorage Pull Testing for Fully Grouted Roof Bolts
Comparison of Some Aspects of Bolting Mechanisms Between Ful
Eclipse System Improves Resin Anchored Rebar Bolting
Design Considerations for Tensioned Bolts
Field Testing of the Fully Grouted Thrust Tensioned Bolts
Improvement in Pre-Tensioning of Strand Bolts in Australian
The Introduction of Roof Bolting to U.S. Underground Coal Mi
Support of Coal Mines in the United Kingdom
The Use of NDT Methods to Determine the Condition of Rockbol
Rockbolted Support of Retreat Longwall Gateroads at 1000m De
Roof Screening: Best Practices and Roof Bolting Machines
Numerical and Physical Modeling as Planning Tools for Rockbo
Stone Mine Design in Highly Fractured Rock
The Importance of Underground Stone Mine Roof Geology
Utilization of Ground-Penetrating Radar to Determine Roof Co
An Examination of the Loyalhanna Limestone's Structural
Highwall Stability in an Open Pit Stone Operation
Overview of Safety Considerations with Highwall Mining Opera
Highwall Monitoring to Combat Rockfall Accidents at Opencast
Seepage and Reinforcement Behavior of Grouting Into Slaking-
Floor Heave in Shallow Room-and-Pillar Mining
Analysis of a Stability Problem in an Underground Coal Mine
Comparison of Acoustic Emission and Stress Measurement Resul
Acoustic Scanner Analysis of Borehole Breakout to Define the
Estimating Rock Strengths Using Drilling Parameters During R
New developments with the coal mine roof rating
Application of geotechnical and geophysical parameters to im
Development of a Risk Rating System for Use in Underground C
Empirical and analytical design of large openings at a propo
Shear Mechanism for Mining-Induced Fractures Applied to Rock
Evaluating Techniques for Monitoring Rock Falls and Slope St
Developments in Sealant Support Systems for Ground Control
Stability Control of Clusters of Deep Openings Around Shaft
The Use of Pneumatic Stowing in Germany Considering Subsiden
A 3-D Semi-Analytical Method for Subsidence Prediction and S
Theory and Technology of Mining Subsidence Control by Grouti
Surface Subsidence Due to the Combined Effects of Undergroun