This report describes a rock mechanics instrumentation program conducted in an underground coal mine in central Illinois. This research project was designed to provide a basic understanding of premining and postmining roof stresses, pillar loading, strata movement, floor heave, and bolt loading at coal mine intersections. The instrumentation plan, a description of the instruments installed in and around a four-way intersection, and the data obtained during the development of the intersection, are presented. Data collected include physical properties of coal and rock, strata lithology, strata movements, in situ stresses, mining-induced stresses, and roof bolt loading. An analysis of observations made and instrumentation results obtained during development and initial monitoring of the intersection is also presented.
Proc. 2nd Conf. Ground Control Prob. in Illinois Coal Basin, Southern Il Univ., May 1985, PP. 76-83