Limit analysis of reinforced embankments on soft soil

Smith, Colin C.; Tatari, Alireza

doi:10.1016/j.geotexmem.2016.01.008

Cited by 25 publications

(8 citation statements)

References 23 publications

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“…The road embankment especially consists of a series of compacted layers placed on top of each other until the subgrade surface level is reached. It is also known as structural embankment and is divided into two types: the unreinforced [69] and reinforced, [70] which serves to distribute traffic load to soil foundation. Therefore, appropriate stability assessment and geometric data methods are essential to ensure the desired efficiency of construction.…”

Section: Embankment Designmentioning

confidence: 99%

A Review of Road Embankment Stability on Soft Ground: Problems and Future Perspective

Mamat

Kasa

Razali

2019

IIUMEJ

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This paper presents an exhaustive review of the challenges faced in the construction of road embankments on soft ground and proposes a direction for future development. Frequently used techniques for soft ground improvement are discussed. The factors that contribute to the stability of the road embankment are reviewed by approach, results of past studies, and historical cases. The findings show that settlement, slope stability, and soil bearing capacity are all challenges to constructing the road embankment. Additionally, it is found that geometric data is a key factor in embankment design. Pre-loading with prefabricated vertical drain (PVDs) methods and lightweight fill were found to be widely used techniques in soft ground improvement. The information from this study can be used to develop design guidance systems, numerical modelling, and to give an overview and knowledge to other researchers who are or will conduct research in this field. Finally, future perspectives for research are related to predictions of factors that affect the stability of road embankment with an artificial intelligence approach. ABSTRAK: Kertas ini membentangkan ulasan kajian menyeluruh mengenai cabaran yang dihadapi dalam pembinaan benteng jalanraya di atas tanah lembut dan mencadangkan ke arah pembangunan kajian masa depan. Teknik-teknik penambahbaikan tanah lembut yang sering digunakan turut dibincangkan. Faktor- faktor yang menyumbang kepada kestabilan benteng jalanraya diulas dengan pendekatan kepada kajian lepas dan sejarah kes. Hasil kajian ini didapati bahawa enapan, kestabilan cerun dan keupayaan galas tanah merupakan cabaran dalam pembinaan benteng jalanraya. Selain itu, ia didapati bahawa data geometri merupakan faktor penting kepada rekabentuk benteng. Kaedah pra pembebanan dengan prefabrikasi saliran menegak (PVDs) dan isian ringan didapati teknik yang popular digunakan dalam pembaikkan tanah lembut masa kini. Maklumat dari kajian ini boleh digunakan untuk membangunkan sistem panduan reka bentuk, pemodelan berangka serta memberi gambaran dan ilmu kepada penyelidik lain yang sedang atau akan menjalankan kajian dalam bidang ini. Akhir sekali, perspektif masa depan untuk penyelidikan berkaitan ramalan faktor-faktor yang mempengaruhi kestabilan embankment jalanraya dengan pendekatan kepintaran buatan.

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Section: Embankment Designmentioning

confidence: 99%

A Review of Road Embankment Stability on Soft Ground: Problems and Future Perspective

Mamat

Kasa

Razali

2019

IIUMEJ

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“…Discontinuity Layout Optimization (DLO) is a limit analysis method which has the potential for being successfully implemented in working platform design, as it has been previously applied to reinforced and unreinforced embankments [7], as well as unbound working platform problems reinforced with geogrids [8]. The method uses the perfect plasticity model with an upper bound yield to determine kinematically admissible mechanisms of plastic collapse.…”

Section: Introductionmentioning

confidence: 99%

Optimising Design of Temporary Working Platforms Made From Hydraulically Bound Materials

Misiarz¹,

Beetham²

2023

World Congress on Civil, Structural, and Environmental Engineering

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Working platforms are temporary geotechnical structures that provide stability to heavy plant on construction sites. Traditionally made from granular unbound material of sufficient thickness, platforms are implemented where the natural ground is not strong enough to support imposed loads. To reduce the depth of minimum required fill, hydraulically bound materials (HBM) can be used. However, there is no design guidance on HBM working platforms as any available methods were developed for purely granular material. This paper considers the case of HBM platforms of varied thicknesses made from lime treated Mercia Mudstone (MMG). The platforms were designed under the industry approved methods and the outputs were analysed using Discontinuity Layout Optimization software. The analysis included comparison between the bearing capacity of granular platforms and HBM of different strength parameters. Results showed that the industry design methods are heavily reliant on the frictional angle of platform material, and they could not properly account for strength of HBM which mobilise substantial strength through cohesion. Although the granular platform design obtained through these methods aligned well with the DLO analysis, they were found to underestimate bearing capacity of HBM platforms when compared to the software. Further DLO analysis showed that the granular platforms had much lower bearing capacity than that of HBM. In the scenarios considered, even adding 0.75% of lime had the potential to decrease the required platform depth to 0.1m (although such a large reduction is not recommended with the design guidance limit advised as 0.3m), compared to 0.7m which would be required if a granular platform was used. It is concluded that future work into the subject with the use of additional analytical software method, while considering the strength of the subgrade as another variable, would give stronger understanding of how HBM platforms could be designed to the greatest benefit.

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“…This method utilises optimization techniques to find the critical collapse mechanism for a wide range of geotechnical problems including slopes and reinforced embankments. While Clarke et al modelled soil nails, more recent work by Smith & Tatari (2016) modelled soil reinforcements in the context of embankment stability, and Xie & Leshchinsky (2015) performed a parametric study to manually determine the optimal geosynthetic reinforcement density for a reinforced wall under a footing load using DLO.…”

Section: Introductionmentioning

confidence: 99%

Optimised design of soil reinforcement layout

Gonzalez-Castejon

Smith

2022

Géotechnique

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The analysis of mechanically stabilised earthworks using geosynthetic reinforcements is typically addressed by means of a limit equilibrium or finite element analysis. However the design of the reinforcement layout and strength is generally specified based on design guidance or on experience. Limit analysis, and in particular Discontinuity Layout Optimization (DLO) presents an alternative for both the analysis and design of reinforced slopes. The current study presents a novel automated approach for determining the optimum layout of reinforcement for any given earthwork geometry. In this paper, a modified formulation of DLO termed Reinforcement Layout and Strength Optimization (RLSO) is presented that is able to find the minimum tensile strength of the reinforcing material and optimal layout required for the stability of the system for a given initial design domain. Examples are given for a slope stability problem and compared with conventional design guidance.

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Limit analysis of reinforced embankments on soft soil

Cited by 25 publications

References 23 publications

A Review of Road Embankment Stability on Soft Ground: Problems and Future Perspective

A Review of Road Embankment Stability on Soft Ground: Problems and Future Perspective

Optimising Design of Temporary Working Platforms Made From Hydraulically Bound Materials

Optimised design of soil reinforcement layout

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