Nondestructive Evaluation of Drilled Shaft Construction Anomalies Using Full Waveform Tomography of Simulated Crosshole Measurements

Kordjazi, Alireza; Coe, Joseph T.; Afanasiev, Michael

doi:10.1007/s10921-020-00728-8

Cited by 8 publications

(4 citation statements)

References 35 publications

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“…Several techniques are utilized to enhance the understanding of defect properties and geometry, with cross-hole tomography representing the most advanced approach. In addition to the ray-based traveltime tomography [18], new methods are under development, including attenuationbased and full-wave inversion techniques [2,19,20].…”

Section: Csl Of Deep Foundation Elementsmentioning

confidence: 99%

Spectral analysis of cross-hole sonic logging data for pile integrity assessment

Lozovsky,

Churkin

2024

Res. Eng. Struct. Mat.

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Ensuring the safety of foundations requires advanced non-destructive testing techniques. Cross-hole sonic logging (CSL) is a widely adopted method for evaluating the integrity of deep foundation elements, such as bored piles, barrettes, and diaphragm walls. This method involves analyzing the propagation time and relative energy of ultrasonic pulses transmitted and registered by probes inserted into pre-installed access tubes. However, in certain cases, standard analyses may not effectively distinguish anomalous signals arising from defects and other factors unrelated to concrete quality. Our study explores the potential of an alternative frequency-domain approach for CSL data analysis. We propose new attributes to quantify ultrasonic signal spectra, including spectrum area, normalized spectrum area, weighted mean frequency, and maximum frequency. These attributes are automatically calculated, eliminating the need for additional data processing time and minimizing the risk of human error. The proposed approach was applied to CSL data collected from two bored piles of 46 m length and successfully identified signals classified as anomalous through standard time-domain analysis. Further research is deemed necessary to fully explore the potential of the frequency-domain approach in enhancing the information content and reliability of CSL pile integrity testing

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Section: Csl Of Deep Foundation Elementsmentioning

confidence: 99%

Spectral analysis of cross-hole sonic logging data for pile integrity assessment

Lozovsky,

Churkin

2024

Res. Eng. Struct. Mat.

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“…Deviation in manufacturing from the design characteristics of the pile in length, continuity, shape, diameter, the strength of the concrete, size of the armature leads to a loss of bearing capacity of the pile and settlement of bridges and foundations, up to the destruction of buildings and structures. The term "continuity of concrete" is understood as "an indicator of the quality of paving, characterizing the continuity of the material and the absence of abnormal zones (sludge, voids)" [1][2][3]. Traditional tests of piles with static and dynamic loads, being the most representative tests, can only determine the carrying capacity of piles, but in no way can guarantee the quality of the pile as a reinforced concrete structure, that is why the international standards provide for the bored pile bore integrity control.…”

Section: General Provisionsmentioning

confidence: 99%

Non-destructive testing of bored piles

Tulebekova

Shakirova²,

Zhankina

et al. 2021

tbus

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Quality control of bored piles is a complex operation aimed at determining possible defects in the pile shaft and the strength of the pile material made by different technologies. The presence of pile shaft defects and a decrease in the strength characteristics of the pile shaft material lead to the development of negative processes at the stage of subsequent operation of the building and structure. It is known that the bearing capacity of the pile material should not be less than the bearing capacity of the ground. Consequently, it is necessary to strictly observe the quality of the concrete of the design strength values to ensure the reliability of the designed building concerning the service life. Nowadays different methods of nondestructive testing such as pile integrity test, cross-hole sonic logging. The paper presents a discussion of the advantages and disadvantages of each of them, experimental data also are given

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“…Despite the vastly different spatial scale, ultrasound computed tomography for non-destructive evaluation and seismic tomography for subsurface imaging share remarkable similarities. Full-waveform inversion has become a state-of-the-art tool for seismic imaging applications, and it is currently an emerging imaging technology for ultrasonic testing of civil infrastructure and geotechnical sites, and several studies highlight its potential [3,4,6,8,12,17]. The remainder of this paper is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

Full-waveform inversion of ultrasonic echo signals to evaluate grouting quality of tendon ducts in post-tensioned concrete structures

Krischer¹,

Strobach²,

Boehm³

et al. 2022

eJNDT

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Reliable techniques for non-destructive evaluation of reinforced and prestressed concrete structures are of utmost importance for the maintenance of aging infrastructure. A particular area of interest is the evaluation of grouting quality within tendon ducts in post-tensioned concrete. Detecting voids and water-filled cavities in plastic or metal ducts is challenging, especially at greater depths or in the vicinity of rebar. Conventional non-destructive inspection methods based on elastic waves, such as impact-echo or ultrasonic pulse echo method using synthetic aperture focusing and/or signal phase analysis, often lack sensitivity to those defects and/or rely on manual and subjective interpretation of the complex data. To overcome these problems, we present a synthetic feasibility study based on full-waveform inversion for reliable ultrasonic non-destructive testing. Full-waveform inversion is a powerful imaging technique that infers tomographic reconstructions of the material properties from ultrasound measurements. The method is widely used for geophysical applications based on seismic waves and has recently gained increasing attention for ultrasonic inspection applications. Using digital twins, we demonstrate the effect of voids and water inclusions on simulated ultrasonic echo signals. This information can be used in an iterative inversion algorithm to create a 3-D quantitative model of the specimen’s interior. We showcase in several numerical examples that even under uncertainties regarding aggregate size distribution and location of the rebar, full-waveform inversion can reveal defects related to the tendon ducts, which enables a robust and automated assessment of the grouting quality.

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Nondestructive Evaluation of Drilled Shaft Construction Anomalies Using Full Waveform Tomography of Simulated Crosshole Measurements

Cited by 8 publications

References 35 publications

Spectral analysis of cross-hole sonic logging data for pile integrity assessment

Spectral analysis of cross-hole sonic logging data for pile integrity assessment

Non-destructive testing of bored piles

Full-waveform inversion of ultrasonic echo signals to evaluate grouting quality of tendon ducts in post-tensioned concrete structures

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