A LABORATORY APPARATUS FOR THE DETERMINATION OF THE ANCHORAGE CAPACITY OF ROCK BOLTS. EVALUATION OF ROCK BOLT ANCHORAGES.

The increasing use of rock bolts as a means of support in underground construction requires additional knowledge on the most efficient rock bolt systems in different rock types. This information is normally obtained from field pull tests at the beginning of construction. Savings in both time and mon...

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Bibliographic Details
Main Author: Tiseo,Benedict
Other Authors: CORPS OF ENGINEERS OMAHA NEBR MISSOURI RIVER DIV
Format: Text
Language:English
Published: 1969
Subjects:
Structural Engineering and Building Technology
Test Facilities
Equipment and Methods
(*UNDERGROUND STRUCTURES
ANCHORS(STRUCTURAL))
(*BOLTS
TEST EQUIPMENT)
ROCK
MECHANICAL PROPERTIES
EXPANDABLE STRUCTURES
MODEL TESTS
LOADS(FORCES)
FRACTURE(MECHANICS)
TEST METHODS
PATTERN RECOGNITION
CURVE FITTING
CRACK PROPAGATION
*ROCK BOLTS
Anchorage
Long Rock
Online Access:http://www.dtic.mil/docs/citations/AD0697732
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0697732
Description
Summary:The increasing use of rock bolts as a means of support in underground construction requires additional knowledge on the most efficient rock bolt systems in different rock types. This information is normally obtained from field pull tests at the beginning of construction. Savings in both time and money could be realized if the optimum rock bolt system could be determined prior to construction. A rock bolt pull test apparatus and procedure have been developed that enable the anchorage capacities of expansion shell rock bolt anchor systems to be determined in the laboratory. In the apparatus, expansion shell rock bolt anchors are set in a hole in a six-inch-diameter, 15-inch long rock core that is cast into a steel confining cylinder. The reaction for pulling of the rock bolt is jacked against the rock core in which the anchor is set. Measurements are made of both the bolt and anchor displacement. (Author)

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