ICGCM Papers:
Advancements in Ground Control Instrumentation
 
 
Application of New Void Detection Algorithm for Analysis of Feed Pressure and Rotation Pressure of Roof Bolters
35th International Conference on Ground Control in Mining
Application of New Void Detection Algorithm for Analysis of Feed Pressure and Rotation Pressure of Roof Bolters
by
Wenpeng LiuJamal RostamiEric Keller, The Pennsylvania State University, State College, United States
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[Conference] 35th International Conference on Ground Control in Mining
[Price] Free  [Comments] 0
[Topical Area] Advancements in Ground Control Instrumentation
[Author] Wenpeng LiuJamal RostamiEric Keller, The Pennsylvania State University, State College, United States
[Abstract] 
Key Conclusions:
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The improved algorithm allows for better detection of the voids and creates information for operators to use in decision making about the installation procedures and additional measures that may be needed to avoid roof/rib failures. Also, the improved algorithm can provide some basic information about the ground conditions that can subsequently be used in evaluation of rock mass and needed ground support.
Key Findings:
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Preliminary analysis of the results in this study shows that the new algorithm is self-adjusting and has improved the capabilities of the existing systems for void detection.
Objective of the Paper:
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This paper briefly introduces ongoing research on void detection by using roof bolter drilling parameters (feed pressure and torque). The goal of the project is to improve the sensitivity of the detection program to locate smaller joints and reduce the number of false alarms. A brief review of the testing procedures, data analysis, and logic and algorithms used for void detection will be offered. Results of preliminary laboratory and statistical analysis of the data from these two drilling parameters used for void detection will be discussed.
Problem Statement:
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Roof and rib instability is one of important issues in underground mining. In order to optimize ground support design and enhance the stability of the ground, it is essential to have an accurate understanding on ground conditions, such as the location of voids, cracks, discontinuities, etc. Currently several manufacturers of roof bolters provide smart roof bolters with limited capabilities for void detection. For instance, in laboratory experiments, the existing algorithms for void detection have limitation on detection of voids that are less than 1/8 inch in opening by using concrete blocks to simulate void conditions. The programs also have shown to miss some voids while in some cases show false detection and there has been a need to revise the algorithms and improve on the capabilities of these programs to be more accurate in sensing voids that are smaller than 1/8 inch, and improve on detection rate while reducing the false alarm rates.