Design of Roof Bolt Patterns for Jointed Rock,

摘要

The objectives of this research were to determine the stability relationships of coal mine roof rocks that are cut by fractures of intersecting joints,with and without roof bolts,under various sets of conditions and to develop criteria for the design of roof bolt systems for such roofs. The problem was studied by mathematical finite element models and by laboratory models. Equations were developed to express the relationships of such factors as horizontal formation pressures,inclination,and friction of joints,bolt loads,roof spans,and rock properties. The main value of the results is that design criteria and tables have been developed to assist in evaluating the stability of fractured roof rock and the bolting that may be used to reinforce it. The application of the methods presented in this report should result in better roof control.