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Entry Stabilization Utilizing Rib Bolting Procedures.

Authors
Tadolini-DD; Tadolini-DD
Source
Paper in Longwall U S A Industrial Presentations Inc Aurora Colorado 1989 :135-147
Link
NIOSHTIC No.
10007342
Abstract
The danger to men, equipment, and pillar structure created by the spalling of a coal rib can be minimized by installing rib bolts. To assure that a configured support system will maintain a coal rib, the U.S. Bureau of Mines developed a rib bolt system based on a nonpreventable failure concept. A statistical equation quantitatively relates the amount of rib retained to the bolt spacing and the width of the spalled material. Laboratory test results show that the equation accurately predicts the amount of material retained while the results also confirm the validity of the support concept. The examination of rib bolting at a coal mine experiencing rib sloughage provides evidence that the effectiveness of the support can be related to the failure pattern of the spalled material. An analysis of roof and roof support reaction to rib sloughage at the mine indicated that the rib sloughage had little effect on roof stability. Although supporting ribs might not affect roof stability, laboratory test results indicate that the material retained by the support can sustain a load up to 20 pct of the material's intact compressive strength.
Publication Date
19890101
Document Type
OP;
Fiscal Year
1989
NTIS Accession No.
NTIS Price
Identifying No.
OP 184-89
NIOSH Division
DRC;
Source Name
Paper in Longwall U.S.A., Industrial Presentations, Inc., Aurora, Co, 1989, PP. 135-147
State
CO;
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