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Hocine Oumeraci - One of the best experts on this subject based on the ideXlab platform.
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soil stability analysis for wave induced momentary liquefaction beneath porous bonded Revetments
Coastal Engineering, 2018Co-Authors: Juan Carlos Alcerrecahuerta, Hocine OumeraciAbstract:Abstract The highly porous Revetments made of Polyurethane Bonded Aggregates (PBA) are an ecologically friendly alternative to conventional Revetments for protection against coastal erosion. No information has yet been reported for these structures on failures from field applications. However, a well-documented collapse of a PBA-Revetment observed in large-scale tests (GWK tests) and a first stability analysis were reported by Oumeraci et al., 2010; 2012. Based on these results, a methodology is proposed for stability analysis of the embankment subsoil beneath PBA-Revetments against momentary liquefaction, considering the results of the comprehensive parametric study (Alcerreca-Huerta, 2014) using a recently developed CFD-CSD (Computational Fluids Dynamics- Computational Solid Dynamics) model wavePoreGeoFoam (Alcerreca-Huerta and Oumeraci, 2016a; 2016b). It will be shown that the proposed stability analysis is able to reproduce the failure observed in the GWK tests, so that it can be applied for PBA-Revetment under field conditions. In this paper, the failure observed in the GWK tests is first briefly reported, followed by a description of the numerical parametric study using the validated wavePoreGeoFoam model in order to extend the conditions tested in GWK. Then, the processes underlying soil liquefaction of PBA-Revetments are outlined, showing that the excess pore pressure development in the sand core beneath PBA-Revetments is crucial. The latter is therefore examined and a formula to predict excess pore pressures in terms of the wave conditions is developed. Moreover, a methodology for the stability analysis of the soil beneath the Revetment against soil liquefaction is proposed and implemented to reproduce the failure observed in the GWK tests. Finally, the main results are summarized and implications for further research are drawn.
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wave induced pressures in porous bonded Revetments part i pressures on the Revetment
Coastal Engineering, 2016Co-Authors: Juan Carlos Alcerrecahuerta, Hocine OumeraciAbstract:Abstract Revetments made of polyurethane bonded aggregates (PBA) are a recent alternative to mitigate coastal erosion. Their advantages over conventional impermeable Revetments are shown in previous studies, based on large-scale laboratory tests (Oumeraci et al., 2010) and CFD modelling (Foyer and Oumeraci, 2013). The latter were conducted to describe the hydrodynamic and hydro-geotechnical processes involved in the wave–structure interaction with PBA Revetments. However, the data generated did not allow a full description of the wave-induced loading of the Revetment and the response of the underlying soil; therefore, a comprehensive parameter study with a computational fluids dynamics–computational solid dynamics (CFD–CSD) model system was performed. This paper (Part I) focuses on the wave-induced pressures on the Revetment, while a companion paper (Part II) describes the pore pressure development just beneath the Revetment and in the embankment subsoil. In this first part, the following issues are addressed: (i) introduction to the numerical parameter study and the CFD–CSD model used for the modelling of the wave-induced pressures; (ii) brief review of the wave load classification and parameterization to define the elements and notations for the wave-induced pressure analysis; (iii) analysis of the peak pressure magnitude, its location on the Revetment, and the spatial pressure distribution; and (iv) the development of prediction formulae, based on the results of the analysis in issue iii. Finally, a summary of the key results and concluding remarks are provided, including the implications and recommendations for engineering applications as well as for further research.
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wave induced pressures in porous bonded Revetments part ii pore pressure just beneath the Revetment and in the embankment subsoil
Coastal Engineering, 2016Co-Authors: Juan Carlos Alcerrecahuerta, Hocine OumeraciAbstract:Abstract This paper considers pore pressure distribution in the embankment subsoil beneath PBA-Revetments, based on the results of the parameter study using the new validated CFD–CSD model system wavePoreGeoFoam described in the companion paper (Part I), which focusses on wave-induced pressures on PBA-Revetments (Alcerreca-Huerta and Oumeraci, 2016-in this issue). In this paper (Part II), a general overview is first provided on the numerical parameter study, especially on the model setup for the extraction of data related to the wave-induced pore pressures in the sand core beneath PBA-Revetments. Secondly, wave-induced pore pressure just beneath the Revetment is analysed considering: peak pressure magnitude, its location beneath the Revetment and their spatial distribution. Afterwards, a process analysis of the results of the parameter study is performed for the wave-induced pore pressure distribution in the sand core. Formulae are developed for the prediction of the pore pressure distribution just beneath the Revetment and of the damping of peak pore-pressures in the sand core. Subsequently, a comparative analysis of the proposed formulae and the approach of De Groot et al. (2006) for the assessment of pore pressure in a porous seabed is made, showing a very good agreement between both results. Finally, implications and recommendations for engineering applications and for further research are drawn from the results.
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cfd csd numerical modelling of wave induced pressures in open pored pba Revetments
Coastal Engineering Proceedings, 2014Co-Authors: Juan Carlos Alcerreca Huerta, Hocine OumeraciAbstract:The highly porous Polyurethane Bonded Aggregates (PBA) Revetments represent a novel ecologically friendly solution for the protection of shorelines and vulnerable coastal areas against erosion. Advantages of the open-pored PBA-Revetments over conventional smooth impermeable Revetments are among others, the reduction of: wave run- up/run-down, wave reflection and wave-induced loads on the sand core beneath the Revetment. However, the hydro- geotechnical processes involved in the interaction of waves with such PBA-Revetments and their foundation are still not sufficiently understood. Therefore, a new 3-dimensional one-way coupled CFD-CSD model system "wavePoreGeoFoam" was developed at the Leichtweis-Institute (LWI) within the OpenFOAM® framework for the analysis of the response of open-pored PBA-Revetments due to wave-induced loads. In this way, this paper firstly describes the new CFD-CSD model system. Second, validation of the model "wavePoreGeoFoam" is shown considering large-scale laboratory tests performed in the Large Wave Flume (GWK) at the Coastal Research Center (FZK) in Hanover, Germany (Oumeraci et al. 2010). Third, the relevance of implementing the CFD-CSD coupling for modelling wave-induced pressures on and beneath PBA-Revetments is discussed. Fourth, a sensitivity analysis related to the effect of the empirically defined parameters for the numerical model is described. Finally, recommendations and implications of the use of CFD-CSD model for further research will be addressed.
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DYNAMIC RESPONSE OF PBA RevetmentS AND SUBSOIL TO WAVE LOADS
Coastal Structures 2011, 2013Co-Authors: Gisa Ludwigs, Hocine OumeraciAbstract:Permeable Bonded Aggregate Revetments (PBA) have the advantage of combining favourable hydraulic performance of porous, permeable structures with the increased stability of bonded structures resulting in a much smaller thickness to resist the same wave loads. In order to improve the understanding of all relevant processes involved in the wave-structure-subsoil interaction, largescale model tests were performed in 2009 in the Large Wave Flume (GWK) of the Coastal Research Centre (FZK) of both universities Braunschweig and Hannover, Germany. The main objectives of these tests were to develop empirical/semi-empirical design formulae for both wave loading and hydraulic performance of PBA Revetments, including the response of their foundation. The present paper addresses the results related to the Revetment displacements and the pore pressures induced by wave loads and particularly focuses on the possible interaction between displacements and pore pressures.
Besperi Besperi - One of the best experts on this subject based on the ideXlab platform.
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REDESAIN Revetment MENGGUNAKAN MATERIAL DOLOS (STUDI KASUS PANTAI MARAS SELUMA)
2020Co-Authors: Zikri M Khairi, Muhammad Fauzi, Besperi BesperiAbstract:Pantai Maras memiliki bangunan pengaman pantai (Revetment) yang berfungsi untuk menahan transport sedimentasi, akan tetapi bangunan tersebut sudah mengalami kerusakan dan deformasi bentuk. Tujuan penelitian ini adalah untuk membangun ulang dengan menggunakan material dolos di Pantai Maras Kabupaten Seluma. Metode penelitian yang digunakan dengan pengolahan data primer yaitu survei langsung dilapangan (Hs dan Ts) sedangkan data sekunder menggunakan metode analisis data angin, dan analisis data pasang surut. Data sekunder pada penelitian ini adalah data angin yang diambil selama 10 tahun (2009- 2018) yang diperoleh dari Badan Meteorologi Klimatologi dan Geofisika (BMKG) Bengkulu dan data pasang surut diambil selama 5 tahun terakhir (2014-2018) yang diperoleh dari LANAL PANGKALAN TNI AL BENGKULU. Hasil dari perhitungan penelitian Revetment dolos mempunyai panjang 177 m, elevasi muka air rencana 2,47 m, elevasi mercu 5,655 m, dan elevasi bangunan 9,655 m, lebar puncak 2,56 m pada bagian lengan. Berat unit lapis pelindung Revetment dolos bagian lengan W= 1,487 ton, W/10= 0,1487 ton, W/200= 0,0075 ton, dan jumlah lapis pelindung tiap 5 m2 sebanyak 5 buah untuk untuk bagian lengan atau badan. Kata kunci : Bangunan Pengaman Pantai, Revetment, Dolos
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ANALISISI BANGUNAN Revetment TERHADAP TINGGI GELOMBANG DI PANTAI PADANG KOTA PADANG
2020Co-Authors: Parlinda Desta, Besperi Besperi, Fauzi MuhammadAbstract:Pantai Padang terletak di Jalan Samudra, Kelurahan Purus, Kecamatan Padang, Kota Padang, Sumatra Barat. Pantai Padang memiliki bangunan pelindung pantai salah satunya yaitu Revetment yang memiliki fungsi untuk melindungi pantai dari serangan gelombang dan limpasan gelombang (overtopping) ke darat, akan tetapi beberapa bangunan tersebut sudah mengalami kerusakan. Tujuan penelitian ini adalah menganalisis bangunan Revetment yang sesuai dengan kondisi pantai dan tidak merubah material bangunan. Metode penelitian dalam penelitian ini meliputi pengumpulan data primer berupa survei langsung di lapangan ( tinggi gelombang, dan dimensi bangunan) dan data sekunder menggunakan metode analisis data angin, dan analisis data pasang surut. Data sekunder pada penelitian ini adalah data angin selama 10 tahun (2010-2019) dan data pasang surut diambil selama 5 tahun (2015-2019) yang diperoleh dari Badan Meteorologi Klimatologi dan Geofisika (BMKG) Maritim Teluk Bayur. Tinggi gelombang hasil pengamatan di lapangan terbesar yaitu 2,71 meter dengan periode 6,79 detik. Sedangkan, dari data BMKG didapatkan nilai tinggi gelombang signifikan sebesar 2,70 meter dan periodenya 6,80 detik. Dimensi Revetment existing di lapangan dengan tinggi bangunan 6,5 meter, elevasi puncak 4 meter, lebar puncak 3 meter, dan dimensi Revetment rencana yang didapatkan yaitu, tinggi bangunan 10,08 meter, elevasi puncak 6,08 meter dan lebar puncak 3,259 meter. Berat unit lapis lindung W = 2,234 ton, W/10 = 223,4 kg, W/200 = 11 kg dan jumlah lapis pelindung tiap 10 m2 16 buah. Kata kunci : Bangunan Pengaman Pantai, Pantai Padang, Revetment, Batu Peca
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DESAIN BANGUNAN Revetment DENGAN BAHAN QUADRIPOD TERHADAP TINGGI GELOMBANG DI PANTAI PADANG KOTA PADANG
2020Co-Authors: Putra, Choly Marendi, Besperi Besperi, Fauzi MuhammadAbstract:Pantai Kota Padang sudah mulai terancam erosi pantai yang dipengaruhi oleh gelombang. Tujuan penelitian ini adalah mendesain bangunan Revetment menggunakan material quadripod di Pantai Padang Kota Padang. Metode penelitian yang digunakan dalam penelitian ini meliputi pengumpulan data primer (data tinggi gelombang di lapangan) dan data sekunder (data angin dan data pasang surut). Data sekunder pada penelitian ini adalah data angin yang diambil selama 10 tahun (2009-2019) yang diperoleh dari Badan Meteorologi Klimatologi dan Geofisika (BMKG) Maritim Teluk Bayur dan data pasang surut diambil selama 5 tahun terakhir (2014-2019) yang diperoleh dari PT. Pelabuhan Indonesia II Teluk Bayur. hasil yang diperoleh dari perhitungan adalah Hs setinggi 2,5 m, Ts sebesar 6,4 detik, elevasi muka air rencana 2 m, elevasi mercu 4,4 m, elevasi bangunan 8,4 m, dan Lebar puncak pemecah Revetment tersebut adalah 1,790 meter. Berat unit lapis pelindung Revetment quadripod bagian lengan atau badan W = 2 ton, Berat lapis pelindung kedua sebesar W/10 = 200 kg, Berat lapis core layer W/200 = 10 kg, dan jumlah lapis pelindung tiap 10 m2 sebanyak 11 buah untuk bagian lengan atau badan. Kata kunci : Bangunan Pengaman Pantai, Revetment, Quadripod
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ANALISIS BANGUNAN Revetment TERHADAP TINGGI GELOMBANG DI PANTAI BERKAS KOTA BENGKULU
2019Co-Authors: Anggista Dina, Muhammad Fauzi, Besperi BesperiAbstract:Pantai Berkas yang terletak di Jalan Pariwisata, Kelurahan Berkas, Kecamatan Teluk Segara, Kota Bengkulu. Pantai Berkas sudah mulai terancam erosi pantai yang di pengaruhi oleh gelombang. Tujuan penelitian ini adalah menganalisis bangunan Revetment yang sesuai dengan kondisi pantai dan tidak mengubah material bangunan dengan material yang baru untuk mencegah dan meminimalisir kemungkinan terjadinya overtopping yang lebih besar dan meyebabkan rusak/runtuhnya bangunan tersebut. Metode penelitian dalam penelitian ini meliputi pengumpulan data primer (data tinggi gelombang di lapangan) dan data sekunder (data angin dan data pasang surut). Data yang digunakan dalam penelitian ini adalah data sekunder yang berupa data angin selama 10 tahun terakhir (2009-2018) dan data pasang surut selama 5 tahun (2014-2018) yang diperoleh dari Badan Metereologi Klimatologi dan Geofisika. Data primer berupa pengamatan dan pengukuran langsung di lapangan, hasil yang diperoleh dari perhitungan adalah Hs setinggi 3,58 m, Ts sebesar 9,24 detik, elevasi mercu sebesar 7,311 meter, elevasi muka air rencana sebesar 2,16 meter, Lebar puncak pemecah Revetment tersebut adalah 4,154 meter. Berat lapis pelindung luar W adalah sebesar 14,135 ton dan tebal lapis lindungnya t adalah sebesar 4,154 meter. Berat lapis pelindung kedua sebesar 1414 kg. tebal lapis lindung kedua adalah sebesar 1,928 meter. Berat lapis core layer adalah sebesar 71 kg. Berat butir pelindung kaki Revetment sebesar 1414 kg. Jumlah lapis pelindung tiap 10 m2 sebanyak 5 buah. Hasil perhitungan Revetment menunjukkan dimensi yang lebih besar dibandingkan dimensi Revetment existing. Kata kunci : Pantai Berkas, Revetment
Fauzi Muhammad - One of the best experts on this subject based on the ideXlab platform.
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ANALISISI BANGUNAN Revetment TERHADAP TINGGI GELOMBANG DI PANTAI PADANG KOTA PADANG
2020Co-Authors: Parlinda Desta, Besperi Besperi, Fauzi MuhammadAbstract:Pantai Padang terletak di Jalan Samudra, Kelurahan Purus, Kecamatan Padang, Kota Padang, Sumatra Barat. Pantai Padang memiliki bangunan pelindung pantai salah satunya yaitu Revetment yang memiliki fungsi untuk melindungi pantai dari serangan gelombang dan limpasan gelombang (overtopping) ke darat, akan tetapi beberapa bangunan tersebut sudah mengalami kerusakan. Tujuan penelitian ini adalah menganalisis bangunan Revetment yang sesuai dengan kondisi pantai dan tidak merubah material bangunan. Metode penelitian dalam penelitian ini meliputi pengumpulan data primer berupa survei langsung di lapangan ( tinggi gelombang, dan dimensi bangunan) dan data sekunder menggunakan metode analisis data angin, dan analisis data pasang surut. Data sekunder pada penelitian ini adalah data angin selama 10 tahun (2010-2019) dan data pasang surut diambil selama 5 tahun (2015-2019) yang diperoleh dari Badan Meteorologi Klimatologi dan Geofisika (BMKG) Maritim Teluk Bayur. Tinggi gelombang hasil pengamatan di lapangan terbesar yaitu 2,71 meter dengan periode 6,79 detik. Sedangkan, dari data BMKG didapatkan nilai tinggi gelombang signifikan sebesar 2,70 meter dan periodenya 6,80 detik. Dimensi Revetment existing di lapangan dengan tinggi bangunan 6,5 meter, elevasi puncak 4 meter, lebar puncak 3 meter, dan dimensi Revetment rencana yang didapatkan yaitu, tinggi bangunan 10,08 meter, elevasi puncak 6,08 meter dan lebar puncak 3,259 meter. Berat unit lapis lindung W = 2,234 ton, W/10 = 223,4 kg, W/200 = 11 kg dan jumlah lapis pelindung tiap 10 m2 16 buah. Kata kunci : Bangunan Pengaman Pantai, Pantai Padang, Revetment, Batu Peca
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DESAIN BANGUNAN Revetment DENGAN BAHAN QUADRIPOD TERHADAP TINGGI GELOMBANG DI PANTAI PADANG KOTA PADANG
2020Co-Authors: Putra, Choly Marendi, Besperi Besperi, Fauzi MuhammadAbstract:Pantai Kota Padang sudah mulai terancam erosi pantai yang dipengaruhi oleh gelombang. Tujuan penelitian ini adalah mendesain bangunan Revetment menggunakan material quadripod di Pantai Padang Kota Padang. Metode penelitian yang digunakan dalam penelitian ini meliputi pengumpulan data primer (data tinggi gelombang di lapangan) dan data sekunder (data angin dan data pasang surut). Data sekunder pada penelitian ini adalah data angin yang diambil selama 10 tahun (2009-2019) yang diperoleh dari Badan Meteorologi Klimatologi dan Geofisika (BMKG) Maritim Teluk Bayur dan data pasang surut diambil selama 5 tahun terakhir (2014-2019) yang diperoleh dari PT. Pelabuhan Indonesia II Teluk Bayur. hasil yang diperoleh dari perhitungan adalah Hs setinggi 2,5 m, Ts sebesar 6,4 detik, elevasi muka air rencana 2 m, elevasi mercu 4,4 m, elevasi bangunan 8,4 m, dan Lebar puncak pemecah Revetment tersebut adalah 1,790 meter. Berat unit lapis pelindung Revetment quadripod bagian lengan atau badan W = 2 ton, Berat lapis pelindung kedua sebesar W/10 = 200 kg, Berat lapis core layer W/200 = 10 kg, dan jumlah lapis pelindung tiap 10 m2 sebanyak 11 buah untuk bagian lengan atau badan. Kata kunci : Bangunan Pengaman Pantai, Revetment, Quadripod
Juan Carlos Alcerrecahuerta - One of the best experts on this subject based on the ideXlab platform.
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soil stability analysis for wave induced momentary liquefaction beneath porous bonded Revetments
Coastal Engineering, 2018Co-Authors: Juan Carlos Alcerrecahuerta, Hocine OumeraciAbstract:Abstract The highly porous Revetments made of Polyurethane Bonded Aggregates (PBA) are an ecologically friendly alternative to conventional Revetments for protection against coastal erosion. No information has yet been reported for these structures on failures from field applications. However, a well-documented collapse of a PBA-Revetment observed in large-scale tests (GWK tests) and a first stability analysis were reported by Oumeraci et al., 2010; 2012. Based on these results, a methodology is proposed for stability analysis of the embankment subsoil beneath PBA-Revetments against momentary liquefaction, considering the results of the comprehensive parametric study (Alcerreca-Huerta, 2014) using a recently developed CFD-CSD (Computational Fluids Dynamics- Computational Solid Dynamics) model wavePoreGeoFoam (Alcerreca-Huerta and Oumeraci, 2016a; 2016b). It will be shown that the proposed stability analysis is able to reproduce the failure observed in the GWK tests, so that it can be applied for PBA-Revetment under field conditions. In this paper, the failure observed in the GWK tests is first briefly reported, followed by a description of the numerical parametric study using the validated wavePoreGeoFoam model in order to extend the conditions tested in GWK. Then, the processes underlying soil liquefaction of PBA-Revetments are outlined, showing that the excess pore pressure development in the sand core beneath PBA-Revetments is crucial. The latter is therefore examined and a formula to predict excess pore pressures in terms of the wave conditions is developed. Moreover, a methodology for the stability analysis of the soil beneath the Revetment against soil liquefaction is proposed and implemented to reproduce the failure observed in the GWK tests. Finally, the main results are summarized and implications for further research are drawn.
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wave induced pressures in porous bonded Revetments part i pressures on the Revetment
Coastal Engineering, 2016Co-Authors: Juan Carlos Alcerrecahuerta, Hocine OumeraciAbstract:Abstract Revetments made of polyurethane bonded aggregates (PBA) are a recent alternative to mitigate coastal erosion. Their advantages over conventional impermeable Revetments are shown in previous studies, based on large-scale laboratory tests (Oumeraci et al., 2010) and CFD modelling (Foyer and Oumeraci, 2013). The latter were conducted to describe the hydrodynamic and hydro-geotechnical processes involved in the wave–structure interaction with PBA Revetments. However, the data generated did not allow a full description of the wave-induced loading of the Revetment and the response of the underlying soil; therefore, a comprehensive parameter study with a computational fluids dynamics–computational solid dynamics (CFD–CSD) model system was performed. This paper (Part I) focuses on the wave-induced pressures on the Revetment, while a companion paper (Part II) describes the pore pressure development just beneath the Revetment and in the embankment subsoil. In this first part, the following issues are addressed: (i) introduction to the numerical parameter study and the CFD–CSD model used for the modelling of the wave-induced pressures; (ii) brief review of the wave load classification and parameterization to define the elements and notations for the wave-induced pressure analysis; (iii) analysis of the peak pressure magnitude, its location on the Revetment, and the spatial pressure distribution; and (iv) the development of prediction formulae, based on the results of the analysis in issue iii. Finally, a summary of the key results and concluding remarks are provided, including the implications and recommendations for engineering applications as well as for further research.
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wave induced pressures in porous bonded Revetments part ii pore pressure just beneath the Revetment and in the embankment subsoil
Coastal Engineering, 2016Co-Authors: Juan Carlos Alcerrecahuerta, Hocine OumeraciAbstract:Abstract This paper considers pore pressure distribution in the embankment subsoil beneath PBA-Revetments, based on the results of the parameter study using the new validated CFD–CSD model system wavePoreGeoFoam described in the companion paper (Part I), which focusses on wave-induced pressures on PBA-Revetments (Alcerreca-Huerta and Oumeraci, 2016-in this issue). In this paper (Part II), a general overview is first provided on the numerical parameter study, especially on the model setup for the extraction of data related to the wave-induced pore pressures in the sand core beneath PBA-Revetments. Secondly, wave-induced pore pressure just beneath the Revetment is analysed considering: peak pressure magnitude, its location beneath the Revetment and their spatial distribution. Afterwards, a process analysis of the results of the parameter study is performed for the wave-induced pore pressure distribution in the sand core. Formulae are developed for the prediction of the pore pressure distribution just beneath the Revetment and of the damping of peak pore-pressures in the sand core. Subsequently, a comparative analysis of the proposed formulae and the approach of De Groot et al. (2006) for the assessment of pore pressure in a porous seabed is made, showing a very good agreement between both results. Finally, implications and recommendations for engineering applications and for further research are drawn from the results.
Jon Blaza - One of the best experts on this subject based on the ideXlab platform.
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A wave flume experiment for studying erosion mechanism of Revetments using geotextiles
Geotextiles and Geomembranes, 2010Co-Authors: Yves-henri Faure, Chia Chun Ho, Rong-her Chen, Matthieu Le Lay, Jon BlazaAbstract:Unfavorable erosion to a Revetment can affect the stability of the bank and may jeopardize the safety of adjacent structures, thus improvement work is needed to increase the stability of the Revetment as well as reducing the possibility of failure. The use of geotextiles as a protection material for banks is not only environmentally friendly, but also stable in the long run. However, improper design of geotextiles may cause considerable loss of soil, which might result in failure. The actual flow behavior in Revetments using geotextiles is rather complicated and can be categorized into three zones, namely, the uni-directional flow zone, the cyclic flow zone, and the tangential flow zone. In this study, a wave flume experiment was performed on model Revetments using two kinds of geotextiles as the filter material to prevent erosion induced by cyclic flows. Soil migration behaviors were monitored. Furthermore, two kinds of cover blocks, riprap and concrete blocks, were carefully placed on the Revetments in order to avoid puncture and abrasion of geotextiles during construction of Revetments. The main purpose of this study is to elucidate the erosion control and filtration performance of soil-geotextile filtration systems under wave action. Two nonwoven needle punched geotextiles were tested. The geotextiles both have the same characteristic opening size, but have a different number of constrictions and different structures. One is a thin double-layer nonwoven material consisting of continuous filaments and the other is a thick one-layer nonwoven material consisting of short fibers. The test result reveals that two different erosion mechanisms occur during wave action. The cyclic wave loadings triggered higher excess pore-water pressure in the upper part of the model and resulted in soil collapse. The geotextile with a higher number of constrictions produced more serious collapse than that with a lower one. At the middle part of the Revetments, soil was eroded by the up-and-down drag force of the flow along the bank. In this zone, the thick geotextile displayed better performance in retarding the drag force on the soil surface. In addition, the opening size and thickness of the geotextile as well as the coverage condition provided by the geotextile were the key factors controlling soil erosion.
