A non-destructive testing method for bolt working load based on box dimension

Abstract

The invention relates to a box-dimension-based working load nondestructive testing method of an anchor rod. The box-dimension-based working load nondestructive testing method of the anchor rod comprises the following steps: according to a one-dimensional rod wave theory, arranging a self-excited acceleration transducer at the exposed end of the anchor rod, testing acceleration response of an anchor rod-surrounding rock interaction system under the action of excitation load by utilizing a KMJ-1 type anchorage quality tester of a mineral anchor rod, judging a supporting and connecting situation between an anchored end and a surrounding rock through waveform identification and parameter analysis, calculating box dimension of the acceleration response, and determining the working load of the anchor rod according to a relation curve of the box dimension and the working load under the corresponding working environment and surrounding rock conditions. According to the box-dimension based working load nondestructive testing method disclosed by the invention, the testing process is simple and quick, the testing result is stable and reliable, any harmful disturbance on an anchorage system and a surrounding rock structure is avoided, and no destruction generates.

Description

technical field [0001] The invention relates to the field of bolt detection, in particular to a method for nondestructive detection of bolt working load based on box dimension. Background technique [0002] With the vigorous development of various types of geotechnical engineering construction in my country, bolt anchoring technology has been widely used in slope stability engineering, underground support engineering, and structural anti-floating, anti-seismic, anti-overturning and other engineering fields. As the main support means in large-scale anchoring projects, prestressed anchor rods can be embedded in stable rock mass, which can produce anti-shear and anti-slip effect on each structural surface, strengthen the integrity, and greatly increase its self-supporting force to achieve common bearing The purpose is to ensure the stability and safety of the anchorage structure. The object of modern bolting is often rock (soil) with poor geological conditions. In the specific...

AI Technical Summary

Problems solved by technology

Although it can provide very useful information, it is a destructive detection method and is restricted by many factors and cannot become a routine method

[0004] Although the results of non-destructive testing are relatively comprehensive, many of them are based on the accurate determination of the bottom reflection energy, and the analysis of the test results is still at the stage of semi-qualitative and semi-quantitative analysis, and the working load of the anchor bolt and Reliable method for the determination of anchorage force

[0005] The limitation of the pull-out test detection method is that at present, it can only be artificially controlled according to the designed anchoring force value, that is, the pullout is terminated when the design value is reached; therefore, the anchor rod with less than the design anchoring force may be damaged, and the anchor rod greater than the design value cannot be damaged. Know its limit anchoring force, and only a small amount of random inspection

[0006] Drilling and coring requires the use of special drilling rigs. Although it can provide very useful information, it is a destructive detection method and is restricted by many factors: the coring process is cumbersome and very expensive; Concentricity is very difficult; the bolts in some places cannot get close to coring; based on the above points, the drilling and coring method cannot become a routine detection method

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