Rapid evaluation method for anchoring quality grade of anchor rod

Abstract

The invention provides a rapid evaluation method for anchoring quality grade of an anchor rod. The method comprises the steps as follows: acquiring reflected wave data with an acoustic wave reflectionmethod, performing normalization and smoothening on a signal to determine a new zero, obtaining peak values and correcting the x direction, removing a low peak value in the forefront, and performingcalculation according to conditions and a threshold value to realize quantitative classification of anchoring quality of the anchor rod. The method is conducted in the time domain in the whole judgment process, only uses simple operation such as interpolation, peak value judgment and slope calculation, has the characteristics of small calculation quantity, high calculation efficiency and the like,meets the requirement of procedures, can obtain accurate and reliable judgment results and has better application effects.

Description

technical field [0001] The invention belongs to the field of engineering measurement, and in particular relates to a rapid evaluation method for anchorage quality grades of anchorage by using an acoustic wave reflection method to perform non-destructive detection on anchorage. Background technique [0002] Bolt support technology is widely used in various support projects. Its principle is to change the mechanical state of the surrounding rock itself by anchoring the bolt into the interior of the surrounding rock, which can improve its circumferential compressive strength and effectively control the surrounding rock. Rock deformation, the anchorage density of the bolt is an important index to evaluate whether the above engineering objectives can be achieved. [0003] In engineering applications, the acoustic wave reflection method is usually used to realize the non-destructive detection of the bolt quality; the acoustic wave reflection method uses the excitation sound wave s...

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Problems solved by technology

[0004] However, the JGJ / T182-2009 regulations only give the qualitative judgment standard for the anchorage density and grade of bolts, and the words used in many places are relatively vague, such as "weak reflection signal at the bottom of the pole", "weak defect reflection wave", " It is not easy to grasp the corresponding scale in practical applications; at the same time, the standard requires simultaneous identification of time-domain signal characteristics and amplitude-frequency signal characteristics, which increases the amount of calculation to a certain extent

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