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Mining Publication: Analysis of Monitored Ground Support and Rock Mass Response in a Longwall Tailgate Entry
Keywords: Ground stability Monitoring Numerical modeling
Original creation date: January 2018
Authors: G Esterhuizen, D Gearhart, I Tulu
Peer Reviewed Journal Article - January 2018
Go to Web Page
NIOSHTIC2 Number: 20050938
Int J Min Sci Technol 2018 Jan; 28(1):43-51
A comprehensive monitoring program was conducted to measure the rock mass displacements, support response, and stress changes at a longwall tailgate entry in West Virginia. Monitoring was initiated a few days after development of the gateroad entries and continued during passage of the longwall panels on both sides of the entry. Monitoring included overcore stress measurements of the initial stress within the rock mass, changes in cable bolt loading, standing support pressure, roof deformation, rib deformation, stress changes in the coal pillar, and changes in the full three-dimensional stress tensor within the rock mass at six locations around the monitoring site. During the passage of the first longwall, stress measurements in the rock and coal detected minor changes in loading while minor changes were detected in roof deformation. As a result of the relatively favorable stress and geological conditions, the support systems did not experience severe loading or rock deformation until the second panel approached within 10-15 m of the instrumented locations. After reaching the peak loading at about 50-75 mm of roof sag, the cable bolts started to unload, and load was transferred to the standing supports. The standing support system was able to maintain an adequate opening inby the shields to provide ventilation to the first crosscut inby the face, as designed. The results were used to calibrate modeled cable bolt response to field data, and to validate numerical modeling procedures that have been developed to evaluate entry support systems. It is concluded that the support system was more than adequate to control the roof of the tailgate up to the longwall face location. The monitoring results have provided valuable data for the development and validation of support design strategies for longwall tailgate entries.
First page of Analysis of Monitored Ground Support and Rock Mass Response in a Longwall Tailgate EntryPeer Reviewed Journal Article - January 2018
Go to Web Page
NIOSHTIC2 Number: 20050938
Int J Min Sci Technol 2018 Jan; 28(1):43-51
See Also
A Case Study of Multi-Seam Coal Mine Entry Stability Analysis with Strength Reduction Method
A Case Study of the Stability of a Non-typical Bleeder Entry System at a U.S. Longwall Mine
Degasification System Selection for U.S. Longwall Mines Using an Expert Classification System
Elastic and Shear Moduli of Coal Measure Rocks Derived from Basic Well Logs Using Fractal Statistics and Radial Basis Functions
Exploration of Limestone Pillar Stability in Multiple-level Mining Conditions Using Numerical Models
Ground Stress in Mining (Part 1): Measurements and Observations at Two Western U.S. Longwall Mines
Ground Stress in Mining (Part 2): Calibrating and Verifying Longwall Stress Models
Multiple-Seam Mining in the United States: Background
Pillar Strength and Design Methodology for Stone Mines
Simplified Pre- and Post-Processing Technique for Performing Finite-Element Analyses of Deep Underground Mines
Page last reviewed: December 17, 2018
Page last updated: December 17, 2018
Content source: National Institute for Occupational Safety and Health, Mining Program
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