Numerical Analysis of Instabilities Affecting an Excavation on the High Speed Line in Northern Morocco

Ardouz, Ghizlane; Baba, Koji

doi:10.1007/978-3-030-34193-0_9

Cited by 4 publications

(11 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Piezometric measures could not be realized on superposed aquifers (no selective piezometers). However, it appears that sandstone is relatively porous (n = 12%) and therefore potentially aquifers with alternating more clayey levels of pelites probably constituting the wall of these aquifers [3]. This is confirmed by the existence of many sources at the base of the excavation, at the interface between numidian sandstones and the pelites of the Tangier nappe [3].…”

Section: Hydrogeological Contextmentioning

confidence: 98%

“…The excavation object of this study is located on the high-speed line between Kenitra and Tangier, specifically in the rural commune of Hjar Nhal, in the region of Tanger-Tetouan-Al Hoceima. It extends for 1170 m in length, its maximum height is 62 m at the axis [3].…”

Section: Geographical Contextmentioning

confidence: 99%

“…It is a formation that was transported during the Rifan tectonic movements, and which rests on the clay pelites of the Tangier Lower Unit. According to the geological map of Tangier (Figure 1 & 2), this aquifer is formed in the upper part by an alternation of sandstone and pelites, at the base of this formation more of clay or pelitic levels are present [3]. From a lithological point of view, we therefore distinguish: -Alternating layers of sandstone (G2) and altered pelites (E5a); -The pure pelites (E5) in the bottom of excavation; -The surface is covered with red clays (E / C).…”

Section: Geological Contextmentioning

confidence: 99%

“…The geotechnical investigations under the law of the structure have involved numerous in situ and laboratory tests [3]. The following categories of materials are defined: -E/C: Colluvial cover soils with a predominantly of clay; -E5a : alteration products of pelites, mainly between 0 and 10m; -E5: pure, rocky pelites; -E5g : alternation of pelite and sandstone (sandstone banks representing between 15 and 40%); -E5g/G : alternation of pelite and sandstone in approximately equal proportions -G2 : sandstone, with pelitic beds (less than 20% pelite) ; -Ga: sandstone alteration [3]. These materials, described as bright red clays, are the result of alterations, sometimes colluviated, of the underlying materials (pelites).…”

Section: Geotechnical Synthesismentioning

confidence: 99%

“…These materials, described as bright red clays, are the result of alterations, sometimes colluviated, of the underlying materials (pelites). They are located on the first 2 meters, and are located on the top of the hills [3].…”

Section: Geotechnical Synthesismentioning

confidence: 99%

See 4 more Smart Citations

Comparison of analytical and numerical methods in the analysis of the stability of an excavation of the high-speed line in northern Morocco

et al. 2020

Self Cite

View full text Add to dashboard Cite

The deformation and failure mechanisms on slopes and in particular the excavations, are very complex. Slope stability analysis is performed using two types of methods: analytical and numerical, which are compared in this article to evaluate their efficiency. The excavation object of this study is situated on the high-speed line between Kenitra and Tangier, specifically in the rural commune of Hjar Nhal, Tangier-Tetouan-Al Hoceima region. It extends for a 1170 m length, its maximum height is 62 m at the axis. The soil of the site is characterized by pelitic formations with the existence of numerous water sources at the base of the excavation. Modelling by analytical methods showed that the excavation did not present a stability problem, contrary to numerical modelling. Firstly, the analysis of the results shows that before the failure, the soil is continuous and that its behaviour cannot be analysed by analytical methods, because a fracture surface cannot be established. It is then necessary to consider numerical methods that take into account the entire volume to analyze the movements and their evolution over time. Secondly, hypotheses have been made about the possibility of a poor estimation of the mechanical characteristics of the soils that constitute the excavation. The review of geotechnical investigations has shown that these soils are coarse with discontinuities that favour water infiltration, and are difficult to characterize, which can lead to an overestimation of their mechanical characteristics.

show abstract

Section: Hydrogeological Contextmentioning

confidence: 98%

Section: Geographical Contextmentioning

confidence: 99%

Section: Geological Contextmentioning

confidence: 99%

Section: Geotechnical Synthesismentioning

confidence: 99%

Section: Geotechnical Synthesismentioning

confidence: 99%

See 3 more Smart Citations

Comparison of analytical and numerical methods in the analysis of the stability of an excavation of the high-speed line in northern Morocco

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

An Examination of the Effects of Overestimating Mechanical Properties on Instabilities: The Tangier-Kenitra High-Speed Line Case Study

Ardouz,

Baba

2023

Springer Proceedings in Earth and Environmental Sciences

View full text Add to dashboard Cite

Novel Methodology for Determining the Mechanical Characteristics of Coarse-Grained Soils

Ardouz

Baba

Bouanani

et al. 2022

Civil and Environmental Engineering

Self Cite

View full text Add to dashboard Cite

Coarse-grained soils are a type of soil frequently found in civil engineering projects, and their mechanical characterization still presents a real challenge. They are composed by elements of different dimensions (from a few microns to tens of centimeters), and can be of very varied nature (clay, sand, gravel, pebbles, etc.). The mechanical characterization of coarse-grained soils is very difficult because of the presence of large elements. In order to be able to characterize them in the laboratory by means of conventional size devices, it is very important to study the influence of significant parameters on the mechanical behavior of coarse-grained soils (the volume fraction, particle size distribution and spread, consolidation level and initial state of the matrix), using the large-sized triaxial testing device. In this paper, we will propose a methodology for evaluating the mechanical characteristics of coarse-grained soils based on soil granulometric reconstruction procedures. The method we have named GALA is based on the use of polynomial correlations between the strength increase due to inclusions and the volume fraction fv and the particle spread (d min /d max) of inclusions. We were able to apply this new method to a natural soil. The results showed the relevance of our method.

show abstract

Numerical Analysis of Instabilities Affecting an Excavation on the High Speed Line in Northern Morocco

Cited by 4 publications

References 1 publication

Comparison of analytical and numerical methods in the analysis of the stability of an excavation of the high-speed line in northern Morocco

Comparison of analytical and numerical methods in the analysis of the stability of an excavation of the high-speed line in northern Morocco

An Examination of the Effects of Overestimating Mechanical Properties on Instabilities: The Tangier-Kenitra High-Speed Line Case Study

Novel Methodology for Determining the Mechanical Characteristics of Coarse-Grained Soils

Contact Info

Product

Resources

About