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Entry stabilization utilizing rib bolting procedures.

Dolinar DR; Tadolini SC

Denver, CO: U.S. Department of the Interior, Bureau of Mines, RI 9366, 1991 Jan; :1-13

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10009159

The danger to personnel, 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 and 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 intact compressive strength of the material.

Ribs-Supports; Coal-deposits; Compressive-strength; Mining-engineering; Rock-mechanics; Bolts; Columns-Supports; Design-criteria; Performance-evaluation; Underground-supporting; Stabilization; Coal-mines; Bolting

19910101

IH; Report of Investigations

1991

PB91-230276

A03

RI-9366

DRC

Denver, CO: U.S. Department of the Interior, Bureau of Mines, RI 9366

CO