Dimension Effect on the Ultrasonic Pulse Velocity

Arman, Hasan; Khosravi, Sadieh; Osman, Mawadah Abdullah; Alnaqbi, Fatema; AlYammahi, Aishah Abdullah

doi:10.18488/journal.10/2017.6.2/10.2.18.25

Cited by 8 publications

(2 citation statements)

References 13 publications

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“…It can be observed that the wave velocities obtained from d4 and d5 exhibit significant differences when compared to the results calculated in existing literature [31][32][33]. In the case of d6, although the size of the wave velocity is consistent with the range of the existing literature, the size changes under the influence of the size effect are quite different [34][35][36]. Therefore, this suggests that the applicability of the wavelet filtering method is limited…”

Section: Methodssupporting

confidence: 52%

Investigation on the dynamic characteristics of anchor rods considering size effect and pull-out loads based on IIR-FDM

Sun,

Zhu,

Song

et al. 2024

Meas. Sci. Technol.

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When the surrounding rock of tunnel anchor bars has boundaries, the signals obtained from NDT of anchor rods will be simultaneously affected by size effects and pull-out loads, leading to potential misinterpretation of the test results. In order to accurately assess the anchorage quality of anchor rods under this interference, NDT and numerical simulations of anchor rods subjected to different anchorage quality were conducted under the influence of size effects and pull-out loads. A signal filtering method, which combines the infinite impulse response-finite difference method , was proposed for identify the impact of size effects. The study analyzed the variations in wave velocity and fundamental frequency of anchor rods with anchorage defects and intact anchor rods under the influence of size effects and pull-out loads. The results indicate that the IIR-FDM method, in comparison to the traditional wavelet method, provides better agreement between the calculated wave velocities and existing findings. With the increase of size effect, the wave velocity and amplitude ratio of the anchor rods decrease, and the fundamental frequency increases first and then decreases. As the working load on the anchor rods increases, the wave velocity initially decreases, then rises, while the fundamental frequency initially increases and then experiences a slight decrease. The presence of anchorage defect results in an increase in the wave velocity and amplitude ratio of the anchor rods, while causing a decrease in the fundamental frequency. This effect of defects on wave velocity and fundamental frequency is more pronounced at lower loads. The wave velocity after IIR-FDM processing has a small error with the simulated wave velocity, indicating the reliability of the processing method.

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Section: Methodssupporting

confidence: 52%

Investigation on the dynamic characteristics of anchor rods considering size effect and pull-out loads based on IIR-FDM

Sun,

Zhu,

Song

et al. 2024

Meas. Sci. Technol.

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“…It is about 600 m thick and consists of tan to light colored limestone with interbeds of shale in lower part and marl in upper part. This formation consists of buff to grey weathered medium-grained fossiliferous, nummulites rich limestone interbedded with yellow marl of Middle -Upper Eocene age at its type of locality in Ain Al Faydah Member[4,8,10,11].…”

mentioning

confidence: 99%

Likely Effects of Geological Features on Carbonate Rock Strength

Arman¹,

Hussein²,

Alshehyari³

et al. 2018

Review of Environment and Earth Sciences

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Rock strength is commonly recognized as a rock ability to resist stress or deformation without breaking down. Its measurement in either in-situ or laboratory environment is costly and requires time-consuming efforts for rock sampling, preparation and laboratory tests. There are different suggested testing methods available such as Unconfined Compressive Strength (UCS), Point Load Index (PLI), Indirect Tensile Strength (ITS), Schmidt Hammer Rebound (SHR), etc. and used to interpret of rock strength properties. The study will only focus on carbonate rocks (Upper Eocene Dammam Formation) which were collected from different selected sites in the Hafeet Mountain area, Al Ain city, United Arab Emirates. Following the sample preparations based on the ASTM standards, about fourth UCS, fourth-one ITS, thirty-seven PLI and hundreds to thousands of SHR tests were carried out on rock blocks and core samples according to ASTM Standards. The study indicates that the relationships between UCS and PLI, ITS, SHR of limestone can be estimated using the simple linear mathematical equations. However, the results exhibit a weak to weaker linear correlation with highly scattered data. This may be due to sample heterogeneity and nature of the sample. Therefore, it still needs better confirmation with more samples from different locations in order to use confidently in engineering applications. Contribution/Originality: This study documents the likely effects of geological features on Upper Eocene carbonate rock strength. It is remarkably noted that the presence of either the cavities or fossils, that have heterogonous distribution, certainly affect geomechanical properties of carbonate rock. This impact was clearly on the laboratory results. rocks is influenced both by the presence of impurities, weak zones and/or discontinuities [1]. Quick changes on meter scale in carbonate rocks structures (layering, fractures, faults, folds), texture (grain

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A Vision-Based Method of Reverse Engineering for 2D CNC Machining

Nguyen

2019

Advances in Engineering Research and Application

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Dimension Effect on the Ultrasonic Pulse Velocity

Cited by 8 publications

References 13 publications

Investigation on the dynamic characteristics of anchor rods considering size effect and pull-out loads based on IIR-FDM

Investigation on the dynamic characteristics of anchor rods considering size effect and pull-out loads based on IIR-FDM

Likely Effects of Geological Features on Carbonate Rock Strength

A Vision-Based Method of Reverse Engineering for 2D CNC Machining

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