Full scale experimental study on vibration scattering using open and in-filled (GeoFoam) wave barriers

Alzawi, Ashref Mohamed A.; Naggar, M. Hesham El

doi:10.1016/j.soildyn.2010.08.010

Cited by 206 publications

(79 citation statements)

References 12 publications

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“…The fill material should therefore be much softer than the surrounding soil while being capable of balancing the surrounding earth pressure [14]. Common fill materials considered include bentonite, soil-bentonite mixtures [15], expanded polystyrene (EPS) [16,17] and other geo-foam materials such as polyurethane [18].…”

Section: Introductionmentioning

confidence: 99%

“…Trenches in the far-field from the source were found to be less effective. More recently Alzawi and El Naggar [18] presented field measurements of open and soft-filled trenches. They confirmed the conclusions from Woods [12] for an open trench but found that for a trench filled with geofoam the reductions for a depth (normalised to the Rayleigh wavelength) of 0.6 were reduced to the equivalent of about 8-10 dB.…”

Section: Introductionmentioning

confidence: 99%

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Reducing railway-induced ground-borne vibration by using open trenches and soft-filled barriers

Thompson

Jiang

Toward

et al. 2016

Soil Dynamics and Earthquake Engineering

103

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A trench can act as a barrier to ground vibration and is a potential mitigation measure for low frequency vibration induced by surface railways. However, to be effective at very low frequencies the depth required becomes impractical. Nevertheless, for soil with a layered structure in the top few metres, if a trench can be arranged to cut through the upper, soft layer of soil, it can be effective in reducing the most important components of vibration from the trains. This study considers the possibility of using such a realistically feasible solution.Barriers containing a soft fill material are also considered. The study uses coupled finite element / boundary element models expressed in terms of the axial wavenumber. It is found to be important to include the track in the model as this determines how the load is distributed at the soil's surface which significantly affects the insertion loss of the barrier. Calculations are presented for a range of typical layered grounds in which the depth of the upper soil layer is varied. Variations in the width and depth of the trench or barrier are also considered. The results show that, in all ground conditions considered, the notional rectangular open trench performs best. The depth is the most important parameter whereas the width has only a small influence on its performance. More practical arrangements are also considered in which the 2 sides of the trench are angled. Barriers consisting of a soft fill material are shown to be much less effective than an open trench but still have some potential benefit. It is found that the stiffness of the barrier material and not its impedance is the most important material parameter.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reducing railway-induced ground-borne vibration by using open trenches and soft-filled barriers

Thompson

Jiang

Toward

et al. 2016

Soil Dynamics and Earthquake Engineering

103

View full text Add to dashboard Cite

show abstract

“…More recently, Alzawi et al [36] presented full scale tests of a 20 m deep and 3 m wide open trench where a harmonic shaker was used as a vibration source. Afterwards, the trench was filled with geofoam, showing an overall reduction in effectiveness of 50 %.…”

Section: Introductionmentioning

confidence: 99%

Efficacy of a sheet pile wall as a wave barrier for railway induced ground vibration

Dijckmans

Ekblad

Smekal

et al. 2016

Soil Dynamics and Earthquake Engineering

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This paper investigates the effectiveness of a sheet pile wall to reduce railway induced vibration transmission by means of field measurements and numerical simulations. At Furet, Sweden, a sheet pile wall has been installed in the soil near the track to reduce train induced vibrations in houses close to the track. The depth of the sheet piles is 12 m with every fourth pile extended to 18 m. The efficacy of the wall is determined from in situ measurements of free field vibrations during train passages before and after installation of the sheet pile wall. The field test shows that the sheet pile wall reduces vibrations from 4 Hz upwards. Up till 16 − 20 Hz, the performance generally increases with frequency and typically decreases with increasing distance behind the wall. The performance is further studied by means of two-and-a-half-dimensional coupled finite element -boundary element models. The sheet pile wall is modeled as an orthotropic plate using finite elements, while the soil is modeled as a layered halfspace using boundary elements. The sheet pile wall acts as a stiff wave barrier and the efficacy is determined by the depth and the stiffness contrast with soil. The reduction of vibration levels is entirely due to the relatively high axial stiffness and plate bending stiffness with respect to the horizontal axis of the sheet pile wall; the plate bending stiffness with respect to the vertical axis is too low to affect the transmission of vibrations. Therefore, it is important to take into account the orthotropic behaviour of the sheet pile wall. It is concluded that a sheet pile wall can effectively act as a wave barrier in soft soil conditions provided that the wall is sufficiently deep.

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“…Another investigation targeted on both open and in-filled trench with GeoFoam material performed by Alzawi and ElNaggar [42]. The results from the experimental study revealed that the GeoFoam barrier can be considered as an effective alternative for vibration reduction.…”

Section: Vibration Solutions On the Propagation Pathmentioning

confidence: 99%

A Review on the Current Methods of Railway Induced Vibration Attenuations

Moghaddam¹

2017

IJSEA

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Railway ground borne vibration is a major problem for high-speed and intercity trains. This problem causes many environmental as well as financial problems for railway companies. In the past decades, there have been numerous methods and strategies to avoid the excessive vibration from vehicles. Many of these methods have been tested and used in tracks and surrounding structures while others are still theories. This paper intends to discuss the current practice in railway vibration reduction and the effectiveness of each method for the different track, vehicle and structures. The methods are divided into three groups; in track, in the path and at the destination solutions. For each category, the results from state-of-the-art research and practice have been presented and conclusion on the appropriate methods and strategies for each case has been made.

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Full scale experimental study on vibration scattering using open and in-filled (GeoFoam) wave barriers

Cited by 206 publications

References 12 publications

Reducing railway-induced ground-borne vibration by using open trenches and soft-filled barriers

Reducing railway-induced ground-borne vibration by using open trenches and soft-filled barriers

Efficacy of a sheet pile wall as a wave barrier for railway induced ground vibration

A Review on the Current Methods of Railway Induced Vibration Attenuations

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