Simplified Design for Vibration Screening by Open and In‐Filled Trenches

Ahmad, Shahab; Al-Hussaini, Tahmeed M.

doi:10.1061/(asce)0733-9410(1991)117:1(67)

Cited by 197 publications

(94 citation statements)

References 12 publications

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“…Their results confirmed that a non-dimensional depth of at least 0.6 is required to give an amplitude reduction of 0.25 (12 dB). Ahmad and Al-Hussaini [32] also used 2D BE models to study an open trench, extended to 3D in [15]. Klein et al [33] used a 3D BE method to study an open trench and Kattis et al [34] studied a row of piles.…”

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

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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%

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

View full text Add to dashboard Cite

show abstract

“…In addition, interventions on the propagation path between source and receiver have the advantage that no modifications of the track are required. These measures include open and in-filled trenches [6,7], wave impeding blocks [8,9] and heavy masses on the soil's surface [1,10,11].…”

Section: Introductionmentioning

confidence: 99%

“…The location and width of the trench are of secondary importance [17]. The isolation effectiveness typically decreases with distance, as wave diffraction can occur around the bottom of the trench [7,18]. The presence of shallow soft soil layers, often only about 2 m deep, leads to increased vibration propagation at frequencies where surface waves can propagate predominantly in these layers [18].…”

Section: Introductionmentioning

confidence: 99%

“…In general, in-filled trenches are less effective than open trenches [8,16,17,20]. While the efficacy of open trenches is mainly determined by their depth, the ratio between the bending stiffness of the barrier and the soil proves crucial for stiff wave barriers [6,7,22,23,24]. Therefore, stiff wave barriers are mostly effective at soft soil sites.…”

Section: Introductionmentioning

confidence: 99%

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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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“…Yatay dalga bariyeri uygulamasıyla da zeminin öz frekansları ve buna bağlı titreşim modları yapay kayanın konumlandırılacağı derinlikle değiştirilerek titreşim etkilerinin azaltılabileceği gösterilmiştir [4][5][6]. Durağan veya hareketli titreşim kaynaklarının ürettiği zemin dalgalarının davranışını ve yayılışını düşey yalıtım araçlarının performansıyla birlikte daha iyi anlayabilmek için son dönemlerde az sayıda da olsa sahada deneysel çalışmalar ve laboratuvar test düzeneklerinde bir dizi araştırmalar gerçekleştirilmiştir [7][8][9]. Ayrıca zemine gömülü yatay bariyer modeli ile ilgili ilk arazi deneylerini Forchap ve Verbic [10] pasif ve aktif yalıtım durumları için gerçekleştirmişlerdir.…”

Section: Studies)unclassified

Yapay Anakaya Kullanilarak Yüksek Hizli Trenleri̇n Alüvyon Zemi̇nlerdeki̇ Çevre Yapilarda Oluşturduğu Ti̇treşi̇m Etki̇leri̇ni̇n Azaltilmasi

Göktepe

Çelebi

Aktaş

2016

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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ÖZETHızlı demiryolu hattına yakın yapıları yumuşak zemin koşullarında taşınan kuvvetli titreşimlerden korumak için dalga bariyeri olarak yapay anakaya modeli inşaat mühendisliğinin pratik uygulamalarında kullanılmaktadır. Bu çalışmada, yüksek hızlı tren trafiğinin meydana getirdiği titreşimlerin demiryolu ağının çevresindeki binalarda oluşturduğu etkilerin azaltılması için dalga engelleyici bariyerlerin yerleştirilmesi araştırılmıştır. Yapay anakayanın aktif ve pasif yalıtım durumlarına göre performansını değerlendirebilmek için ayrıntılı parametrik çalışmalar gerçekleştirilmiştir.Anahtar Kelimeler: Yapay anakaya, yüksek hızlı tren, alüvyon zeminlerde dalga yayılımı, sonlu elemanlar metodu, doğrusal olmayan malzeme davranışı USING ARTIFICIAL BEDROCK IN MINIMIZING THE EFFECTS OF VIBRATION INDUCED BY HIGH SPEED TRAINS ON THE NEARBY STRUCTURES IN ALLUVIAL SOILS ABSTRACTAn artificial bedrock as wave impeding barrier can be used in practical civil engineering applications as isolation measures to protect structures from strong vibrations transmitted through soft ground nearby high-speed railway track. This study focuses on mitigation of the effects of high speed trains inducued vibrations on the strucutres which are located near the track lines by installing wave impeding barriers. Extensive parametric studies on the screening performance of wave impeding barrier have been done for both active and passive isolation cases.Keywords: Artificial bedrock, high speed train, wave propagation in alluvial soils, finite element method, nonlinear behaviour of soil

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Simplified Design for Vibration Screening by Open and In‐Filled Trenches

Cited by 197 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

Yapay Anakaya Kullanilarak Yüksek Hizli Trenleri̇n Alüvyon Zemi̇nlerdeki̇ Çevre Yapilarda Oluşturduğu Ti̇treşi̇m Etki̇leri̇ni̇n Azaltilmasi

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