Centrifuge and numerical modelling of ground-borne vibration from surface sources

Yang, Wenbo; Hussein, M.F.M.; Marshall, Alec M.; Cox, C.M.

doi:10.1016/j.soildyn.2012.09.003

Cited by 24 publications

(7 citation statements)

References 32 publications

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“…This model test focuses on the dynamic response of a pile-soil composite foundation with an adjacent tunnel under the load of a high-speed railway. The deformation of the structural model is mainly elastic deformation, so only the elastic similarity criterion needs to be satisfied [20][21][22]. The base similarity ratio of this model test was determined after full consideration of the feasibility and periodicity of the test.…”

Section: Similarity Ratios and Materials Parametersmentioning

confidence: 99%

Dynamic Response of Pile-Soil Foundation with an Adjacent Tunnel under the High-Speed Train Loads: A Case Study

Zhu

et al. 2022

Applied Sciences

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In order to study the dynamic response characteristics of a pile-soil foundation when an adjacent tunnel exists, both model tests and numerical simulations were performed in this study. Taking the peak vibration acceleration, peak vibration velocity, and peak vibration displacement as the evaluation indexes of the dynamic response, the dynamic response of the pile-soil foundation with an adjacent tunnel under high-speed train loads is studied. A method of dividing the affected zones of the dynamic response based on the safety threshold is provided in this paper, which can evaluate the safety of the adjacent tunnel under the action of train load. Additionally, the effect of train speed on dynamic response is further analyzed. The results show that the dynamic response index inside the foundation decays significantly with increasing distance from the surface when the train load is applied, regardless of the presence or absence of the adjacent tunnel. Compared with an ordinary pile-soil foundation, the dynamic response indexes inside the foundation increase significantly when there is an adjacent tunnel. With the increase in the horizontal distance from the pile foundation, the distribution characteristics of the horizontal transverse direction of each dynamic response index inside the foundation change from a “wavy” distribution to a monotonically decreasing distribution. According to the safety threshold of vibration velocity, the foundation is divided into the hazardous affected zone, strongly affected zone, and weakly affected zone, and then the corresponding vibration reduction measures are adopted. With the increase in train speed, the effect of tunnel structure on the attenuation of dynamic response in a pile-soil foundation becomes more obvious.

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Section: Similarity Ratios and Materials Parametersmentioning

confidence: 99%

Dynamic Response of Pile-Soil Foundation with an Adjacent Tunnel under the High-Speed Train Loads: A Case Study

Zhu

et al. 2022

Applied Sciences

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“…Any undesirable reflections of the compressional wave and shear wave from the rigid boundaries of the steel box could reduce the accuracy of the test results. To eliminate boundary effects, an energy absorbing material, i.e., Duxseal (30 mm thick), was installed on the bottom and side walls of the box to absorb incident waves [43][44][45][46]. e test model was mainly composed of a subway tunnel and the surrounding soil layer ( Figure 1).…”

Section: Test Facilitiesmentioning

confidence: 99%

“…By varying the amount of components of the mixed material, different elastic parameters can be obtained, as shown in Table 2. e material properties of the soils and lining segments for the prototype and the testing model have been presented in Tables 3 and 4, respectively. e soils were poured into the steel box from a constant height at a constant velocity in order to ensure the uniformity of the soil and to control its density [46,49].…”

Section: Parametersmentioning

confidence: 99%

Vibration Induced by Subway Trains: Open‐Trench Mitigation Analysis in the Time and Frequency Domains

Yang

Yuan

Wang

2018

Shock and Vibration

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In this paper, we analyse the mitigation effects of open trenches on the vibrations induced by subway trains. The study is performed by using both physical model tests and numerical simulations. The effectiveness is evaluated by calculating the frequency response function (FRF) and the vibration acceleration peak (VAP) in both time and frequency domains. The experimental and numerical results demonstrate that the open trench has clear effects on the dynamic soil response. Both time and frequency domain results suggest that the dynamic response of the soils beyond the open trenches could be significantly affected, due to the existence of the open trench. According to the frequency domain analysis, the inclusion of open trenches could effectively reduce the soil response in a higher frequency range. Due to reflection effects at the boundaries of the trench, an amplification of the soil response in front of the open trench is observed. Parametric study by means of numerical simulations is also performed. The width of the open trench demonstrates negligible effects on the dynamic soil response, whilst the trench depth exhibits a large influence on the trench isolation performance. With an increase in the trench depth, the isolation performance is significantly improved. It is concluded that the open trenches perform well as an isolation barrier, in mitigating the vibration induced by subway trains.

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“…This reduces the magnitude of reflections and hence replicates the idealized prototype scenario more accurately (Zeng and Schofield, 1996). Conventional absorbing materials used by centrifuge modelers have included foam (Ha et al 2011), sponge rubber (Itoh et al 2005) and Duxseal (Madabhushi 1991;Pak and Guzina 1995;Cheney et al 1990;Yang et al 2013aYang et al , 2013b not been carefully investigated (Yang 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Ground-borne dynamic events can be generated in a variety of ways, including natural disasters, such as earthquakes and volcanic eruptions, and human actions, such as construction activities, the operation of heavy trucks, and underground railways. Numerous studies have been undertaken using geotechnical centrifuges to investigate these different dynamic scenarios (Zeng and Schofield 1996;Coelho et al 2003;Yang et al 2013aYang et al , 2013b. When creating small-scale geotechnical centrifuge models, it is important to replicate the stress profile of the full-scale scenario.…”

Section: Introductionmentioning

confidence: 99%

Effect of Duxseal on Horizontal Stress and Soil Stiffness in Small-Amplitude Dynamic Centrifuge Models

Cui

Heron

Marshall

2022

Geotechnical Testing Journal

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The constitutive behavior of soil is stress dependent. Therefore, geotechnical centrifuges are widely used to replicate full-scale stress fields, thereby ensuring the correct soil response within reduced-scale centrifuge models. A vibration absorbing material (such as Duxseal) is commonly employed to reduce the effect of reflected waves generated at the boundaries of rigid containers in dynamic centrifuge tests.However, such a material has the potential to deform laterally under the high horizontal stresses applied within centrifuge tests and consequently the initial at rest lateral earth pressure condition will not be maintained. A procedure to back-calculate the lateral earth pressure coefficient (𝐾) is presented in this paper.In addition, two experimental methods, which are implemented to evaluate 𝐾 by measuring the shear wave velocity from centrifuge-based air hammer testing and triaxial based bender element testing, are described.Results demonstrate that significant lateral earth pressure and soil stiffness reductions are observed within the upper soil region (top third of the model depth). In addition, the appropriate manipulation of the crosscorrelation method used to process shear wave signals is discussed and an empirical equation to predict the small strain shear modulus of the dry silica sand (HST95 Congleton sand) used in this study is provided.Outcomes of this study are directly applicable to small-amplitude dynamic centrifuge tests such as groundborne vibrations; some factors relating to large-amplitude seismic studies, such as soil inertial effects and

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Centrifuge and numerical modelling of ground-borne vibration from surface sources

Cited by 24 publications

References 32 publications

Dynamic Response of Pile-Soil Foundation with an Adjacent Tunnel under the High-Speed Train Loads: A Case Study

Dynamic Response of Pile-Soil Foundation with an Adjacent Tunnel under the High-Speed Train Loads: A Case Study

Vibration Induced by Subway Trains: Open‐Trench Mitigation Analysis in the Time and Frequency Domains

Effect of Duxseal on Horizontal Stress and Soil Stiffness in Small-Amplitude Dynamic Centrifuge Models

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