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ground-borne vibrations induced by impact pile driving: experimental assessment and mitigation measures

Earthquake Engineering and Engineering Vibration 2023年第1期22卷 105-115页

作者： A.Colaço A.M.Abouelmaty P.Alves Costa CONSTRUCT-FEUP University of PortoRua Dr.Roberto FriasPorto 4200-465Portugal Arab Academy for Science Technology&Maritime TransportCollege of Engineering and TechnologyAlexandriaEgypt

Impact pile driving is an interesting technique for the construction of deep foundations from a practical and economical point of view.However,the generalization of this technique can be restricted due to the excessive vibration levels that can be generated,which can be especially problematic in residential areas.However,different mitigation measures can be applied to prevent excessive vibration levels inside buildings located near construction sites.To compare its efficiency through a numerical prediction tool,two experimental test sites are first presented and characterized.From the results obtained,it was found that the construction of an open trench near the impact source can be used as an efficient mitigation measure to reduce the maximum vibration levels evaluated in this study.

关键词： impact pile driving ground-borne vibrations experimental and numerical analysis mitigation measures

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vibrations induced by tunnel boring machine in urban areas: In situ measurements and methodology of analysis

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第1期15卷 130-145页

作者： Antoine Rallu Nicolas Berthoz Simon Charlemagne Denis Branque University of Lyon ENTPELTDS-UMR CNRS 5513CeLyAVaulx-en-VelinFrance French Centre for Tunnel Studies(CETU) BronFrance

Excavation with tunnel boring machine(TBM)can generate vibrations,causing damages to neighbouring buildings and disturbing the residents or the equipment.This problem is particularly challenging in urban areas,where TBMs are increasingly large in diameter and shallow in depth.In response to this problem,four experimental campaigns were carried out in different geotechnical contexts in France.The vibration measurements were acquired on the surface and inside the TBMs.These measurements are also complemented by few data in the literature.An original methodology of signal processing is pro-posed to characterize the amplitude of the particle velocities,as well as the frequency content of the signals to highlight the most energetic bands.The levels of vibrations are also compared with the thresholds existing in various European regulations concerning the impact on neighbouring structures and the disturbance to local residents.

关键词： ground-borne vibrations Tunnel boring machine(TBM) In situ measurement Dynamic characterization Vibration levels Site spectrum

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Prediction of ground-borne vibration induced by impact pile driving:numerical approach and experimental validation

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Earthquake Engineering and Engineering Vibration 2023年第4期22卷 921-935页

作者： A.Colaço P.Alves Costa C.Ferreira C.Parente J.Fernandez-Ruiz CONSTRUCT-FEUP University of PortoRua Dr.Roberto Frias4200-465 PortoPortugal University of La Coruña Department of Civil EngineeringCampus de Elviña 15071La CoruñaSpain

Deep foundations are currently used in engineering practice to solve problems caused by weak geotechnical characteristics of the ground.Impact pile driving is an interesting and viable solution from economic and technical points of view.However,it is necessary to ensure that the environmental drawbacks,namely ground-borne vibration,are adequately met.For this purpose,the authors propose an axisymmetric finite element method-perfectly matched layer(FEM-PML)approach,where the nonlinear behavior of the soil is addressed through an equivalent linear methodology.Given the complexity of the problem,an experimental test site was developed and fully characterized.The experimental work comprised in-situ and laboratory soil characterization,as well as the measurement of vibrations induced during pile driving.The comparison between experimental and numerical results demonstrated a very good agreement,from which it can be concluded that the proposed numerical approach is suitable for the prediction of vibrations induced by impact pile driving.The experimental database is available as supplemental data and may be used by other researchers in the validation of their prediction models.

关键词： pile driving ground-borne vibrations numerical modeling experimental validation

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Prediction of vibrations induced by trains on line 8 of Beijing metro

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第4期11卷 280-293页

作者： De-yun DING Shashank GUPTA Wei-ning LIU Geert LOMBAERT Geert DEGRANDE Sehool of Civil Engineering Beijing Jiaotong University Beijing 100044 China Department of Civil Engineering K. U Leuven B3001 Heverlee Belgium

This paper mainly discusses the problem of ground-borne vibrations due to the planned line 8 of Beijing metro which passes under the National Measurement Laboratory.A lot of vibration sensitive equipments are placed in the laboratory.It is therefore necessary to study the impact of vibrations induced by metro trains on sensitive equipments and important to propound a feasible vibration mitigation measure.Based on the coupled periodic finite element-boundary element (FE-BE) method,a 3D dynamic track-tunnel-soil interaction model for metro line 8 has been used to predict vibrations in the free field induced by trains running at variable speeds between 30 km/h and 80 km/h.Four types of track structures commonly used on the Beijing metro network have been considered:(1) high resilience direct fixation fasteners,(2) Vanguard fasteners,(3) a floating slab track and (4) a floating ladder track.For each of these track types,the vibration isolation efficiency has been compared.The results of the numerical study can be used to predict vibrations in nearby buildings and to decide upon effective vibration countermeasures.

关键词： ground-borne vibrations Coupled periodic finite element-boundary element (FE-BE) method Track structure Vibration isolation efficiency

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