Non-destructive detection method and device of effective anchorage depth of full-length bonding anchor

A method for non-destructive testing of an effective anchorage depth of a fully grouted anchor bolt, comprising:

• impacting an end of an extended section of an anchor bolt multiple times with different amplitudes, so as to enable the anchor bolt to generate different accelerations;
• acquiring acceleration values at different depths along the anchor bolt by using several accelerometers disposed at the different depths along the anchor bolt;
• and
• observing the acceleration values obtained by the accelerometers, wherein if an acceleration value from one of the accelerometers is below a threshold indicating an effective anchorage length of the anchor bolt, it is determined that the anchor bolt, at a depth of the one of the accelerometers, is sufficiently adhered to surrounding rock, and the depth represents an effective anchorage length of the anchor bolt, and otherwise, if the acceleration value is above the threshold, it is determined that adhesion of the anchor bolt at the depth of the one of the accelerometers is insufficient, the anchor bolt is loose, and the depth fails to represent an effective anchorage length of the anchor bolt.