ABSTRACT
Ground Support in Mining and Underground Construction-Villaescusa & Potvin (eds.) © 2004 Taylor & Francis Group, London, ISBN 90 5809 640 8
ABSTRACT: The role of bolt surface profiles on load transfer mechanism of bolt/resin/rock is examined in the laboratory experiments under both constant normal stiffness (CNS) and constant normal load (CNL) conditions. The CNS tests were carried out in a specially constructed shearing apparatus, while the CNL tests were carried out using the short encapsulation push and pull tests in steel tubes. The CNL tests included tests on smooth walled and rough surfaced bolts. Further studies undertaken included a series of both underground and laboratory conventional pull tests on short length resin anchors (up to 300 mm long). The study have demonstrated that; load transfer capacity of bolt is influenced by the method of testing; the bolt profile configuration played a dominant role influencing the load transfer capacity of the bolt resin rock interaction; and increased thickness of resin encapsulation had a negative influence on bolt anchorage performance.
