Identification of rock bolt length in situ conditions
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Central Mining Institute
Andrzej Czesław Staniek   

Central Mining Institute
Submission date: 2020-10-12
Final revision date: 2021-04-02
Acceptance date: 2021-04-16
Online publication date: 2021-04-22
Publication date: 2021-04-22
A rock bolt which is grouted into the rock strata may not be installed according to the assumed project. It concerns also cases where due to practical reasons it is impossible to drill a hole with a sufficient deepness. The consequence of that is that it is necessary to cut the rock bolt accordingly. Another case is where the rock bolt is damaged, cut or bent. Than it is desirable to check the quality of supporting elements – installed rock bolts and the length of insertion. In proposed paper an outline of a method for measurement of rock bolt length is presented. The method uses ultrasonic transducers and is based on a pulse emission of an impulse wave. As ultrasonic transducer works both as an emitter and receiver, the reflected wave is measured and the length of the object or the position of a crack or damage may be diagnosed.
The realised research was financed by Polish Ministry of Science and High Education, project no 11060317.
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