An Investigation of the Interaction of Rock and Types of Rock Bolts for Selected Loading Conditions.

摘要

This investigation of the interactions between rock bolts and the surrounding rock was directed toward understanding the support mechanisms and characteristics of expansion-anchor and resin-grouted roof bolts as used in coal mines. The investigation involved laboratory,theoretical,and field work. The objective was to be able to design rock bolt support systems with some of the same confidence that is used in other engineering fields. This is a difficult task because of the generally unknown loads that bear on the mine structure and because of the variable nature of the rock properties and weakness planes in the rock. Work on this investigation consisted of laboratory shear tests on various types of rock bolts;creep tests on resin-grouted steel bars;finite element analyses of single bolts,bolted roof structures,and friction rock stabilizers;and a field program where strain measurements were made at various points along resin-grouted bolts for a period of several months. The various design criteria are presented in a step-by-step manner as used by a design engineer. Example problems are solved.