NIOSHTIC-2 Publications Search

Slickenside Occurrence in Coal Mine Roof of the Valley Camp No. 3 Mine Near Wheeling, West Virginia.

Ellenberger JL

NTIS: PB 300 366 :17 pages

10000799

The Bureau of Mines investigated the occurrence of slickensides in mine roof in the Pittsburgh coalbed in a portion of the Valley Camp No. 3 Mine in southwestern Pennsylvania to improve the potential for prediction of slickensided zones and determine the orientations of the most prominent slickensided planes. Two distinct types of slickensides were identified; those which were associated with clay veins observed in the coalbed (genetic), and those which were unrelated to any visible structure (nongenetic). The study draws three conclusions: (1) nongenetic slickensides are not the result of tectonic forces, (2) both genetic and nongenetic slickensides tend to dip at an angle of 30 deg, and (3) genetic slickensides tend to be alined parallel to the trend of the clay vein and usually dip toward the center of the clay vein. A schematic roof bolting plan is presented that may provide improved roof support where slickensides are present. Roof stability could be improved by supplemental bolting in the direction normal to the plane of slickensides.

19790101

IH; Report of Investigations

1979

PB-300366

A03

RI 8365

PRC;

NTIS: PB 300 366

PA; WV;