scholarly journals Analytical and Numerical Evaluation of Limit States of MSE Wall Structure

2016 ◽  
Vol 12 (2) ◽  
pp. 145-152 ◽  
Author(s):  
Marián Drusa ◽  
Jozef Vlček ◽  
Martina Holičková ◽  
Ladislav Kais
Keyword(s):  
Model Comparison ◽  
Retaining Wall ◽  
Wall Structure ◽  
Limit States ◽  
Safety Level ◽  
Analysis And Design ◽  
Railway Line ◽  
Wall Structures ◽  
Mse Wall ◽  
Mechanically Stabilized

Abstract Simplification of the design of Mechanically Stabilized Earth wall structures (MSE wall or MSEW) is now an important factor that helps us not only to save a time and costs, but also to achieve the desired results more reliably. It is quite common way in practice, that the designer of a section of motorway or railway line gives order for design to a supplier of geosynthetics materials. However, supplier company has experience and skills, but a general designer does not review the safety level of design and its efficiency, and is simply incorporating into the overall design of the construction project. Actually, large number of analytical computational methods for analysis and design of MSE walls or similar structures are known. The problem of these analytical methods is the verification of deformations and global stability of structure. The article aims to clarify two methods of calculating the internal stability of MSE wall and their comparison with FEM numerical model. Comparison of design approaches allows us to draft an effective retaining wall and tells us about the appropriateness of using a reinforcing element.

Crash Wall Design to Protect Mechanically Stabilized Earth Retaining Walls

2013 ◽  
Vol 2377 (1) ◽  
pp. 49-60
Author(s):  
Akram Y. Abu-Odeh ◽  
Kang-Mi Kim
Keyword(s):  
Structural Damage ◽  
Retaining Wall ◽  
Retaining Walls ◽  
Wall Structure ◽  
Mechanically Stabilized Earth ◽  
Element Analysis ◽  
Wall Panels ◽  
Mse Wall ◽  
Mechanically Stabilized ◽  
Earth Fill

Mechanically stabilized earth (MSE) retaining walls are used to provide roadway elevation for bridge approaches, underpass frontage roads, and other roadway elevation applications. Vehicular traffic may exist on the high (fill) side of the MSE retaining wall, the low side, or both sides. For traffic on the high side, a conventional traffic barrier might be placed on or near the top of the wall and mounted on a moment slab or a bridge deck. For traffic on the low side, a conventional traffic barrier might be installed adjacent to the wall or the wall itself may serve as the traffic barrier. Typical MSE wall panels are not designed to resist vehicle impacts. Therefore, structural damage to the wall panels and the earth fill would require complicated and expensive repairs. A simple reinforced-concrete crash wall constructed in front of the MSE wall panels could significantly reduce damage to the panels. It might prove practical to implement such a design to reduce costly repairs to the MSE wall structure. In this paper, LS-DYNA finite element analysis code was used to model and analyze a sacrificial crash wall design to determine its effectiveness in protecting an MSE retaining wall. Based on the LS-DYNA simulations, a crash wall that is 8 in. (0.2 m) thick is considered to be an adequate design to reduce damage to the MSE wall.

scholarly journals Mechanically Stabilized Earth with Steel Reinforcement

2021 ◽  
Vol 9 (3) ◽  
pp. 135-141
Author(s):  
Magdi M. E. Zumrawi ◽  
Abubaker B. B. Barakat ◽  
Idris M. I. Abdalla ◽  
Rabab A. A. Altayeb
Keyword(s):  
Retaining Wall ◽  
Soil Reinforcement ◽  
Current Status ◽  
Mechanically Stabilized Earth ◽  
Steel Strips ◽  
Wall Structures ◽  
Backfill Soil ◽  
Mse Walls ◽  
Mechanically Stabilized

This paper presents the Mechanically Stabilized Earth (MSE) technique as a practical option for earth retaining wall structures. The literature pertaining soil reinforcement methods and their application in MSE walls were intensively reviewed. The present work focused on evaluating the performance of MSE walls with backfill soil reinforced by steel strips. Almolid square overpass bridge in Khartoum, which was constructed in 2015 with MSE walls as lateral support of the overpass ramps, was considered as case study. Based on field observations, the current status of the overpass bridge has proven that the use of MSE walls is successful and beneficial for sustainability of the overpass.  

scholarly journals Investigation of Damage Diagnosis of Retaining Wall Structures Based on the Hilbert Damage Feature Vector Spectrum

2019 ◽  
Vol 2019 ◽  
pp. 1-22
Author(s):  
Qian Xu
Keyword(s):  
Energy Spectrum ◽  
Feature Vector ◽  
Retaining Wall ◽  
Damage Index ◽  
Wall Structure ◽  
Impulse Response Functions ◽  
Damage State ◽  
Damage Diagnosis ◽  
Wall Structures ◽  
Diagnosis Method

To diagnose damages within the retaining wall structure, the Hilbert marginal energy spectrum was acquired via the Hilbert–Huang transformation of virtual impulse response functions of responses to the retaining wall under ambient excitations. Based on the Hilbert marginal energy spectrum, the Hilbert damage feature vector spectrum was created. On the basis of the damage feature vector spectrum, a damage identification index was proposed. Based on the damage feature vector spectrum and damage index, the damage state of the retaining wall was detected by the damage feature vector spectrum, damage locations of the wall were diagnosed by the damage index trend surface, and the damage intensity of the wall was identified by the quantitative relationship between the damage index and damage intensity. Based on this, a damage diagnosis method for retaining wall structures was proposed. To verify the feasibility and validity of the damage diagnosis method, both model tests and field tests on a pile plate retaining wall are performed under ambient excitations. Test results show that the damage state of the wall can be detected sensitively, damage locations can be diagnosed validly, and damage intensity can be identified quantitatively via this damage diagnosis method.

scholarly journals ANALISIS STABILITAS BACK-TO-BACK MECHANICALLY STABILIZED EARTH WALLS (STUDI KASUS JALAN LAYANG DI SULAWESI SELATAN)

2021 ◽  
Vol 4 (3) ◽  
pp. 657
Author(s):  
Yordan Salim ◽  
Andryan Suhendra
Keyword(s):  
Safety Factor ◽  
Urban Areas ◽  
Retaining Wall ◽  
Tensile Force ◽  
Wall Structure ◽  
Mechanically Stabilized Earth ◽  
Mechanically Stabilized Earth Walls ◽  
Mechanically Stabilized ◽  
The Stability ◽  
Earth Walls

In urban areas, the requirement for roads is always increasing. This has resulted in various problems such as limited land so that it needs to construct a proper retaining wall. The type of retaining wall that will be discussed is back-to-back mechanically stabilized earth walls. The author analyzes the minimum reinforcement length required for the stability of the retaining wall structure. The author also analyzes the use of backfill material from back-to-back mechanically stabilized earth walls. In this study, two types of backfill materials were used, sand and laterite. The author analyzes the stability of the structure using manual calculations and with software based on finite element methods with several differences in the reinforcement length of the geogrid. In manual analysis obtained the tensile force that occurs in the geogrid and the safety factor for the external stability. In the analysis using the software obtained the safety factor and deformation that occurs in the structure. The results of this study are the minimum ratio of reinforcement length to height, that is L = 0.66H for sand and L = 0.6H for laterite. The requirement of geogrid tensile capacity for laterite is smaller than for sand.Keywords: reinforcement length, mechanically stabilized earth walls, geogrid, safety factorPada daerah perkotaan, kebutuhan akan jalan selalu meningkat. Hal ini mengakibatkan berbagai masalah seperti keterbatasan lahan sehingga perlu konstruksi dinding penahan tanah yang tepat. Jenis dinding penahan tanah yang akan dibahas adalah back-to-back mechanically stabilized earth walls. Penulis menganalisis panjang penjangkaran minimum yang diperlukan untuk statbilitas struktur dinding penahan tanah. Penulis juga menganalisis penggunaan material timbunan dari back-to-back mechanically stabilized earth walls. Pada penelitian ini digunakan dua jenis material timbunan yaitu pasir dan tanah merah. Penulis menganalis kestabilan dari struktur menggunakan perhitungan manual dan dengan software berbasis metode elemen hingga dengan beberapa variasi panjang penjangkaran dari geogrid. Pada analisis manual, diperoleh gaya tarik yang terjadi pada geogrid dan faktor keamanan dari stabilitas eksternal struktur. Pada analisis menggunakan program diperoleh faktor keamanan dan deformasi yang terjadi pada struktur. Adapun hasil dari penelitian ini yaitu rasio panjang penjangkaran terhadap tinggi minimum yaitu L = 0,66H pada pasir dan L = 0,6H untuk tanah merah. Kebutuhan kapasitas tarik geogrid untuk tanah merah lebih kecil daripada pasir.Kata kunci: panjang penjangkaran, mechanically stabilized earh walls, geogrid, faktor keamanan

Frame - Shear Wall Structures Subjected to Vertical Deformation and the Shrinkage and Creep of Concrete Relations

2012 ◽  
Vol 166-169 ◽  
pp. 3403-3407
Author(s):  
Lin Pan ◽  
Li Wei Zhang
Keyword(s):  
Shear Wall ◽  
Wall Structure ◽  
Vertical Deformation ◽  
Concrete Creep ◽  
Analysis And Design ◽  
High Rise ◽  
Wall Structures ◽  
Internal Forces ◽  
The Difference ◽  
The Impact

Frame - shear wall structural system are widely used in high-rise buildings . During the construction period , a different pressure than due to the loads and their respective axis , resulting in the existence of vertical deformation of the difference between the components , this difference will frame - shear wall structure beams internal forces have an important impact . The existence of concrete creep and shrinkage , so that the impact of further increase . A frame - shear wall structure high-rise buildings for the analysis object , using the finite element method , and analyze the impact of contraction of the construction process of concrete creep frame - shear wall structure of the vertical deformation and internal forces , a number of recommendations for the rationalization for structural analysis and design practical , in order to service engineering

scholarly journals Using Recycled Material from the Paper Industry as a Backfill Material for Retaining Walls near Railway Lines

2021 ◽  
Vol 13 (2) ◽  
pp. 979
Author(s):  
Karmen Fifer Bizjak ◽  
Barbara Likar ◽  
Stanislav Lenart
Keyword(s):  
Retaining Wall ◽  
Paper Industry ◽  
Time Lag ◽  
Wall Structure ◽  
Railway Line ◽  
Backfill Material ◽  
Geotechnical Structures ◽  
Sludge Ash ◽  
The Impact ◽  
Recycled Material

The construction industry uses a large amount of natural virgin material for different geotechnical structures. In Europe alone, 11 million tonnes of solid waste is generated per year as a result of the production of almost 100 million tonnes of paper. The objective of this research is to develop a new geotechnical composite from residues of the deinking paper industry and to present its practical application, e.g., as a backfill material behind a retaining structure. After different mixtures were tested in a laboratory, the technology was validated by building a pilot retaining wall structure in a landslide region near a railway line. It was confirmed that a composite with 30% deinking sludge and 70% deinking sludge ash had a high enough strength but experienced some deformations before failure. Special attention was paid to the impact of transport, which, due to the time lag between the mixing and installation of the composite, significantly reduced its strength. The pilot retaining wall structure promotes the use of recycled materials with a sustainable design, while adhering to government-mandated measures.

Study of Seismic Design Method for Slope Supporting Structure of Soil Nailing

2013 ◽  
Vol 353-356 ◽  
pp. 2073-2078
Author(s):  
Tian Zhong Ma ◽  
Yan Peng Zhu ◽  
Chun Jing Lai ◽  
De Ju Meng
Keyword(s):  
Seismic Design ◽  
Calculation Method ◽  
Retaining Wall ◽  
Earth Pressure ◽  
Calculation Model ◽  
Soil Nailing ◽  
Case Record ◽  
Analysis And Design ◽  
Supporting Structure ◽  
Earthquake Action

Slope anchorage structure of soil nail is a kind of economic and effective flexible slope supporting structure. This structure at present is widely used in China. The supporting structure belong to permanent slope anchorage structure, so the design must consider earthquake action. Its methods of dynamical analysis and seismic design can not be found for the time being. The seismic design theory and method of traditional rigidity retaining wall have not competent for this new type of flexible supporting structure analysis and design. Because the acceleration along the slope height has amplification effect under horizontal earthquake action, errors should be induced in calculating earthquake earth pressure using the constant acceleration along the slope height. Considering the linear change of the acceleration along the slope height and unstable soil with the fortification intensity the influence of the peak acceleration, the earthquake earth pressure calculation formula is deduced. The soil nailing slope anchorage structure seismic dynamic calculation model is established and the analytical solutions are obtained. The seismic design and calculation method are given. Finally this method is applied to a case record for illustration of its capability. The results show that soil nailing slope anchorage structure has good aseismic performance, the calculation method of soil nailing slope anchorage structure seismic design is simple, practical, effective. The calculation model provides theory basis for the soil nailing slope anchorage structure of seismic design. Key words: soil nailing; slope; earthquake action; seismic design;

scholarly journals Structural Behavior of Prefabricated Ecological Grid Retaining Walls and Application in a Highway in China

Symmetry ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 746
Author(s):  
Xinquan Wang ◽  
Cong Zhu ◽  
Hongguo Diao ◽  
Yingjie Ning
Keyword(s):  
Retaining Wall ◽  
Contact Point ◽  
Retaining Walls ◽  
Wall Structure ◽  
Soil Arching ◽  
Finite Element Software ◽  
Study Results ◽  
Stress And Deformation ◽  
Asymmetrical Condition ◽  
Construction Efficiency

The retaining wall is a common slope protection structure. To tackle the current lack of sustainable and highly prefabricated retaining walls, an environmentally friendly prefabricated ecological grid retaining wall with high construction efficiency has been developed. Due to the asymmetrical condition of the project considered in this paper, the designed prefabricated ecological grid retaining wall was divided into the excavation section and the filling section. By utilizing the ABAQUS finite element software, the stress and deformation characteristics of the retaining wall columns, soil, anchor rods, and inclined shelves in an excavation section, and the force and deformation relationships of the columns, rivets, and inclined shelves in three working conditions in a filling section were studied. The study results imply that the anchor rods may affect the columns in the excavation section and the stress at the column back changes in an M-shape with height. Moreover, the peak appears at the contact point between the column and the anchor rod. The displacement of the column increases slowly along with the height, and the column rotates at its bottom. In the excavation section, the stress of the anchor rod undergoes a change at the junction of the structure. The inclined shelf is an open structure and is very different from the retaining plate structure of traditional pile-slab retaining walls. Its stress distribution follows a repeated U-shaped curve, which is inconsistent with the trend of the traditional soil arching effect between piles, which increases first and then decreases. For the retaining wall structure in the filling section, the numerical simulated vehicle load gives essentially consistent results with the effects of the equivalent filling on the concrete column.

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