A study on the application of the parallel seismic method in pile testing

Lu, Zhi Tang; Wang, Zhi Liang; Liu, Dong Jia

doi:10.1016/j.soildyn.2013.09.021

Cited by 21 publications

(4 citation statements)

References 16 publications

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“…2(b). This is the principle of conventional parallel seismic tests (Liao and Roesset, 1995;Liao et al, 2006;Huang and Chen, 2007;Lo et al, 2009;Ni et al, 2011;Huang and Ni, 2012;Niederleithinger, 2012;Lu et al, 2013;Zhang and Chen, 2013). Evidently, the slopes of the two fitting lines are affected by the velocity of the P waves in the pile and the velocity of the P waves in the soil below the pile tip.…”

Section: Introductionmentioning

confidence: 94%

PS wave based parallel seismic test for pile length assessment

Song

Chen

et al. 2016

Soils and Foundations

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This paper presents an improved method for conducting parallel seismic tests to detect the unknown length and integrity of piles. The method involves the use of PS waves rather than the PP waves normally applied in conventional parallel seismic tests. Analytical solutions are derived for the t-d relationships of the first arrivals of the PS waves in homogeneous and layered soil conditions. Finite element models are also developed to simulate the waves generated by a vertical impact on the top of a pile under these two ground conditions for the purpose of validating the analytical solutions. The study indicates that the proposed method is viable and has several advantages over conventional parallel seismic tests.

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Section: Introductionmentioning

confidence: 94%

PS wave based parallel seismic test for pile length assessment

Song

Chen

et al. 2016

Soils and Foundations

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“…e velocity components are located on the physical surface of the computational model, the shear stress terms are also on the surface so that they can be set to zero, and guided elastic waves in structures are analyzed at MHz frequencies [24]; thus, these free surface treatments limit the SFD modeling and generalization ability. e SFD method has been used for the analysis of platform-pile systems without considering the free surface of 3D structures [26,30,31]. e computational domain is a regular cuboid domain.…”

Section: Discretization Schemesmentioning

confidence: 99%

A Study on Integrity Testing for Platform-Pile Systems considering Wave Propagation

Lin

2022

Mathematical Problems in Engineering

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Platform-pile systems are typically used in bridge foundations and seaport structures. These systems are difficult to analyze using a conventional low-strain integrity test (LST) due to periodic oscillations. A staggered-grid finite-difference (SFD) method is proposed for a platform-pile system in soil and verified with ABAQUS and measured data. Different impact locations on the top surface of the platform and the lateral surface of the pile are analyzed, and parallel velocities are obtained at different locations. Choosing an appropriate impact location reduces the influence of the periodic oscillation signal; the impact locations at the center of symmetry are the best choices. At the same impact energy, the impact location should not be outside the cross section of the pile when the impact occurs on the top surface of the platform to achieve a meaningful damage signal. When the impact locations are on the lateral surface of the pile, the interferences are relatively small, and the damage vibration signal can be detected. The material and size of the hammer determine the impact duration and should be chosen to reduce the high-frequency influences and obtain reasonable data for analysis.

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“…The CSL method is employed for assessing the strength and defects (size and location) of piles [3,4], while the PS method is applied for evaluating the length of piles and internal features such as voids, necking, and bulge parts within the piles [5]. In contrast to the CSL or PS methods that utilize elastic waves, the Thermal Integrity Profiling (TIP) method, which employs heat, has been applied to cast-in-place piles [6,7].…”

Section: Introductionmentioning

confidence: 99%

Non-Destructive Evaluation of Material Stiffness beneath Pile Foundations Tip Using Harmonic Wavelet Transform

Oh,

Park,

Park

2024

Buildings

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Pile foundations are used to support superstructures and play an important role in the safety of these structures. The performance of pile foundations generally depends on the conditions of the pile itself and the material under the pile, especially for end-bearing piles installed in soft soil volumes. Therefore, to assess the performance of existing pile foundations, it is crucial not only to evaluate the structural integrity of the pile itself, but also to assess the ground conditions, such as subsoil stiffness beneath the pile foundation. Accessing the subsoil beneath the pile foundation is highly challenging in the field. Hence, there is a need for the development of non-destructive pile evaluation methods that allow the assessment of subsoil stiffness beneath the pile without direct access to the subsoil. Various non-destructive methods have been developed for pile performance assessment. However, these conventional non-destructive methods are primarily designed for assessing the structural integrity of the pile itself, and there are no existing non-destructive pile integrity testing methods applicable to evaluate the subsoil stiffness beneath the pile tip. In this study, a non-destructive method is developed to evaluate the subsurface soil stiffness beneath pile without direct access. The proposed method involves applying impact loading to the easily accessible pile head and measuring the elastic waves propagated within the pile foundation due to the impact loading. These wave signals are then recorded at the pile head. The measured time–history signals are decomposed using harmonic wavelet transform. This allows the obtainment of well-defined magnitude and phase information over time for various individual frequency components composing the wave. In this study, a method is proposed to assess the stiffness of the subsoil beneath the pile by simultaneously utilizing the magnitude and phase information of the measured signals obtained through harmonic wavelet transform. To facilitate this, a step-by-step data analysis procedure for evaluating the subsoil stiffness beneath the pile is introduced. To validate the proposed method, numerical simulations were conducted using ABAQUS. The experimental data obtained from the numerical simulations were processed using the proposed method to assess the subsoil stiffness beneath the pile. The determined subsoil stiffness was then compared with the exact soil stiffness used in the numerical simulation to evaluate the validity of the proposed method. Through this analysis, the proposed method demonstrated its effectiveness in assessing the subsoil stiffness beneath piles installed in weak soil volume.

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A study on the application of the parallel seismic method in pile testing

Cited by 21 publications

References 16 publications

PS wave based parallel seismic test for pile length assessment

PS wave based parallel seismic test for pile length assessment

A Study on Integrity Testing for Platform-Pile Systems considering Wave Propagation

Non-Destructive Evaluation of Material Stiffness beneath Pile Foundations Tip Using Harmonic Wavelet Transform

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