Detection of sedimentary structural elements using formation micro imager technique, a case study from South Mansoura-1 well, Nile Delta, Egypt

AbstractMany researchers have carried out experimental and numerical investigations to examine building structures’ response to explosive loads. Studies of bridges subjected to blast loads are limited. Hence, in this study, we present a case study on a cable-stayed bridge, namely, Charles River Cable-Stayed Bridge-Boston, to assess its robustness and resistance against the progressive collapse resulting from localized failure due to blast loads. Three different blast scenarios are considered to interpret the bridge performance to blast loads. To monitor the progressive failure mechanisms of the structural elements due to blast, pre-defined plastic hinges are assigned to the bridge deck. The results conclude that the bridge is too weak to sustain the blast loads near the tower location, and the progressive collapse is inevitable. Hence, to preserve this cable-stayed bridge from local and global failure, structural components should be more reinforced near the tower location. This case study helps the designer better understand the need for blast resistance design of cable-stayed bridges.

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Stability charts based on the finite element method for underground cavities in soft carbonate rocks: validation through case-study applications

Natural Hazards and Earth System Science ◽

10.5194/nhess-19-2079-2019 ◽

2019 ◽

Vol 19 (10) ◽

pp. 2079-2095 ◽

Cited By ~ 2

Author(s):

Michele Perrotti ◽

Piernicola Lollino ◽

Nunzio Luciano Fazio ◽

Mario Parise

Keyword(s):

Finite Element ◽

Safety Margin ◽

Structural Elements ◽

The Finite Element Method ◽

Geometrical Features ◽

Overall Stability ◽

Underground Cavities ◽

The Stability ◽

Rock Mechanical Properties

Abstract. The stability of man-made underground cavities in soft rocks interacting with overlying structures and infrastructures represents a challenging problem to be faced. Based upon the results of a large number of parametric two-dimensional (2-D) finite-element analyses of ideal cases of underground cavities, accounting for the variability both cave geometrical features and rock mechanical properties, specific charts have been recently proposed in the literature to assess at a preliminary stage the stability of the cavities. The purpose of the present paper is to validate the efficacy of the stability charts through the application to several case studies of underground cavities, considering both quarries collapsed in the past and quarries still stable. The stability graphs proposed by Perrotti et al. (2018) can be useful to evaluate, in a preliminary way, a safety margin for cavities that have not reached failure and to detect indications of predisposition to local or general instability phenomena. Alternatively, for sinkholes that already occurred, the graphs may be useful in identifying the conditions that led to the collapse, highlighting the importance of some structural elements (as pillars and internal walls) on the overall stability of the quarry system.

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An integrated framework for urban resilience to climate change – Case study: Sea level rise impacts on the Nile Delta coastal urban areas

Urban Climate ◽

10.1016/j.uclim.2015.09.005 ◽

2015 ◽

Vol 14 ◽

pp. 554-565 ◽

Cited By ~ 14

Author(s):

M.A. Abdrabo ◽

Mahmoud A. Hassaan

Keyword(s):

Climate Change ◽

Sea Level Rise ◽

Sea Level ◽

Urban Areas ◽

Nile Delta ◽

Urban Resilience ◽

Integrated Framework ◽

Sea Level Rise Impacts

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An Integrated Approach to Improve Safety Margins While Drilling – A Case Study from Ha'py Field, Offshore Nile Delta

10.2118/175875-ms ◽

2015 ◽

Author(s):

Mohamed El Waseef ◽

Peter Bentham ◽

Lorraine Wild ◽

Mohamed Mansour ◽

Saher Ismail ◽

...

Keyword(s):

Nile Delta ◽

Integrated Approach ◽

Safety Margins

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Investigating the possible measure to protect groundwater from polluted streams in Arid and Semi-Arid Regions: the Eastern Nile Delta case study

10.5194/egusphere-egu21-14734 ◽

2021 ◽

Author(s):

Ismail Abd-Elaty ◽

Martina Zelenakova ◽

Salvatore Straface ◽

Zuzana Vranayová ◽

Mohamed Abu-hashim ◽

...

Keyword(s):

Drinking Water ◽

Arid Regions ◽

Nile Delta ◽

Total Dissolved Solids ◽

Polluted Water ◽

Deep Aquifer ◽

Lower Permeability ◽

The Impact ◽

Semi Arid

Groundwater is the main source of drinking water in the Nile Delta. Unfortunately, it might be polluted by seepage from polluted streams. This study was carried out to investigate the possible measures &#160;to &#160;protect groundwater&#160; in the Nile delta aquifer using a numerical model (MT3DMS - Mass Transport 3-Dimension Multi-Species). The sources of groundwater contamination were identified and the total dissolved solids (TDS) was taken as an indicator for the contamination. Different strategies were investigated for mitigating the impact of polluted water: i) allocating polluted drains and canals in lower permeability layers; ii) &#160;installing cut-off walls in the polluted drains, and finally, iii) using lining materials in polluted drains and canals. Results indicated these measures effective to mitigate the groundwater pollution. In particular, the cut-off wall was effective for contamination reduction in shallow aquifers, whereas it had no effect in the deep aquifer, while lining materials in polluted drains and canals were able to prevent contamination and to protect the freshwater in the aquifers. &#160;It is worth mentioning that this study was partially supported by a bilateral project between ASRT (Egypt) and CNR (Italy).&#160;&#160;

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Application of Modal-Displacement Based Design Method to Multi-Story Timber Blockhaus Structures

Applied Sciences ◽

10.3390/app10113889 ◽

2020 ◽

Vol 10 (11) ◽

pp. 3889

Author(s):

Martina Sciomenta ◽

Vincenzo Rinaldi ◽

Chiara Bedon ◽

Massimo Fragiacomo

Keyword(s):

Design Method ◽

Fe Model ◽

Structural Elements ◽

Base Shear ◽

Shear Loads ◽

Story Drift ◽

Displacement Based ◽

Technical Interest ◽

Wooden Structures

Structures under seismic excitation undergo different inter-story drift levels that can be associated to damage of both structural and non-structural elements, and thus to the expected losses. The Modal-Displacement Based Design (DBD) procedure, in this regard, has been developed to fix major issues of Force Based Design (FBD) approaches, thus to design multi-story buildings in which the inter-story drift can allow one to control damage mechanisms. In this paper, the conventional Modal-DBD methodology is applied to multi-story timber buildings constructed using the Blockhaus technology. Given their intrinsic geometrical and mechanical features (i.e., stacking of logs, door/window openings, gaps and friction mechanisms, etc.), dedicated methods of analysis are required for them, compared to other wooden structures. A three-story case-study Blockhaus system of technical interest is thus presented for the assessment of Modal-DBD calculation steps. As shown, special care must be spent for the selection of convenient inter-story drift limits that in general should reflect the characteristics of the examined structural typology. The backbone parameters are thus collected for each shear-wall composing the 3D Blockhaus building, based on refined Finite Element (FE) analyses of separate log-walls. The overall results of the Modal-DBD process are thus finally assessed by means of a Push-Over (PO) analysis, carried out on a simplified 3D FE model of the examined multi-story structure. The comparison of FE predictions, as shown, demonstrates that reliable estimates can be obtained when the Modal-DBD procedure is applied to timber Blockhaus systems. In particular, base shear loads can be estimated with good accuracy, while the corresponding top displacements are slightly overestimated (with up to +10%–14% the expected values, for the collapse prevention performance level).

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Use of Ground Penetration Radar (GPR) in the Evaluation of Geological-Structural Elements of Ornamental Carbonated Rocks - Case Study in Valinho De Fatima, Portugal

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/362/1/012101 ◽

2019 ◽

Vol 362 ◽

pp. 012101

Author(s):

Joao Duarte ◽

Jose Carvalho ◽

Fernando Figueiredo

Keyword(s):

Structural Elements ◽

Ground Penetration Radar

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Assessing the Potential Impacts of the Grand Ethiopian Renaissance Dam on Water Resources and Soil Salinity in the Nile Delta, Egypt

Sustainability ◽

10.3390/su11247050 ◽

2019 ◽

Vol 11 (24) ◽

pp. 7050 ◽

Cited By ~ 4

Author(s):

Sherien Abdel Aziz ◽

Martina Zeleňáková ◽

Peter Mésároš ◽

Pavol Purcz ◽

Hany Abd-Elhamid

Keyword(s):

Surface Water ◽

Water Resources ◽

Soil Salinity ◽

Crop Yields ◽

Nile Delta ◽

National Income ◽

Water Levels ◽

Groundwater Levels ◽

Deep Aquifers

Several studies have reported that the construction of the Grand Ethiopian Renaissance Dam (GERD) could have severe effects on the water resources in downstream countries, especially Egypt. These effects include changes in surface water level, groundwater levels in shallow and deep aquifers, saltwater intrusion, and increases in soil salinity, which could affect crop yields. This paper assesses the potential impacts of the GERD on the Nile Delta, Egypt. It includes the effects of reducing surface water levels (SWL) and changing the crop patterns at the groundwater levels (GWL), in addition to the effect of cultivating crops that consume less water on soil salinity. A pilot area is selected in the east of the Nile Delta for the assessment. The results of the study revealed that GWL is directly proportional to SWL. Comparing the case study of 2012, when SWL was reduced by 50%, the GWL decreased from 5.0 m to 2.0 m. After adjustment, the crop patterns from rice to other crops decreased the GWL to 1.30 m. Additionally, the results showed that there is a significant relationship between soil salinity and crop patterns. Soil salinity increased during the cultivation of the Delta with non-rice crops, such as grapes. Salinity increased from 0.45 S/m after 10 years of simulation to 0.48 S/m. This estimation highlights the undesirable effects of the GERD on Egypt’s water resources, soil salinity, crop yields, and national income.

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