Entry stabilization utilizing rib bolting procedures

Technical Report · Tue Jan 01 04:00:00 EST 1991

OSTI ID:5794054

Dolinar, D R; Tadolini, S C

The danger to personnel, equipment, and pillar structure created by the spalling of a coal rib can be minimized by installing rib bolts. This paper reports that, 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.

• Research Organization: Bureau of Mines, Pittsburgh, PA (United States)
• OSTI ID: 5794054
• Report Number(s): RI-9366
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
012031* -- Coal
Lignite
& Peat-- Underground Mining-- Strata Mechanics & Control-- (1987-)
COAL MINES
DESIGN
EQUIPMENT
MINES
MINING
MINING EQUIPMENT
NATIONAL ORGANIZATIONS
PERSONNEL
ROOF BOLTS
ROOM AND PILLAR MINING
STABILITY
SUPPORT PILLARS
UNDERGROUND FACILITIES
UNDERGROUND MINING
US BUREAU OF MINES
US DOI
US ORGANIZATIONS