Box-dimension-based working load nondestructive testing method of anchor rod
A non-destructive testing, box dimension technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of troublesome coring process, difficulty in concentricity of core drill and anchor rod, expensive problems, etc., to achieve reliable results and simple testing process quick effect
Inactive Publication Date: 2014-06-04
TAIYUAN UNIV OF TECH
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Problems solved by technology
[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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[0025] The above and other technical features and advantages of the present invention will be described in more detail below in conjunction with the accompanying drawings.
[0026] The process of the non-destructive detection method for bolt working load based on the box dimension of the present invention is as follows: according to the one-dimensional rod wave theory, a self-excited acceleration sensor is placed at the exposed end of the bolt, and the anchoring quality of the KMJ-1 mine bolt is used The detector measures the velocity response of the bolt-surrounding rock interaction system under the excitation load, judges the support connection between the anchorage end and the surrounding rock, and determines the effective anchorage length of the bolt through waveform identification and parameter analysis. , estimate the ultimate bearing capacity of the anchor, obtain the relationship curve between the box dimension and the working load, and determine the working load of the...
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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...
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IPC IPC(8): G01N3/00
Inventor 李义梁腾飞薛荣芳
Owner TAIYUAN UNIV OF TECH