scholarly journals Effect of Halabjah Earthquake on Al-Wand Earth Dam: Numerical Analysis

2021 ◽  
Vol 318 ◽  
pp. 01016
Author(s):  
Intisar H. Abbas ◽  
Maysam Th. Al-hadidi
Keyword(s):  
Numerical Modeling ◽  
Numerical Analysis ◽  
Natural Disaster ◽  
Seismic Activity ◽  
Earth Dam ◽  
The North ◽  
Porewater Pressure ◽  
The Stability ◽  
Earthquake Vibration ◽  
The Impact

The Halabja earthquake occurred on 12/11/2017 in Iraq, with a magnitude of 7.3 Mw, which happened in the Iraqi-Iranian borders. This earthquake killed and injured many people in the Kurdish region in the north of the country. There is no natural disaster more dangerous than earthquake, especially it occurs without warning, great attention must be paid to the impact of earthquakes on the soil and preparing for a wave of earthquakes. Numerical modeling using specific elements is considered a powerful tool to investigate the required behavior of structures in Geotechnical engineering, and the main objective of this is to assess the response of the Al-Wand dam to the Halabja earthquake, as this dam is located in an area that has been subjected to seismic activity recently. The modeling was done through the Geo-studio program, where the seepage was analyzed during the Al-wand dam using the Seep/w program. It was verified that the dam was safe against seepage failure and then moved to the QUAKE/W (a subprogram of GEOSTUDIO, which is used for liquefaction modeling of earthquakes and dynamic loading and determines the movement and increased pressures of pore water that arise due to earthquake vibration or sudden shock loads). The program was used to analyze the effect of the earthquake on the porewater pressure, effective stresses, and displacements. Also, it is not clear that the significant impact the earthquake has on these values. Finally, the Slope/w program was used to analyze the stability of the dam and to calculate the safety factor of the dam in two ways, and the results of the analysis show that the dam is considered safe under the influence of the tremor.

scholarly journals Do Long-Term Natural Disasters Influence Social Trust? Empirical Evidence from China

2021 ◽  
Vol 18 (14) ◽  
pp. 7280
Author(s):  
Yao Li ◽  
Haoyang Li ◽  
Jianqing Ruan
Keyword(s):  
Natural Disasters ◽  
Natural Disaster ◽  
Social Trust ◽  
Geographical Location ◽  
Household Survey ◽  
Flood Frequency ◽  
Psychological Characteristics ◽  
The North ◽  
The Impact

The natural environment is one of the most critical factors that profoundly influences human races. Natural disasters may have enormous effects on individual psychological characteristics. Using China’s long-term historical natural disaster dataset from 1470 to 2000 and data from a household survey in 2012, we explore whether long-term natural disasters affect social trust. We find that there is a statistically significant positive relationship between long-term natural disaster frequency and social trust. We further examine the impact of long-term natural disaster frequency on social trust in specific groups of people. Social trust in neighbors and doctors is stronger where long-term natural disasters are more frequent. Our results are robust after we considering the geographical difference. The effect of long-term natural disasters remains positively significant after we divide the samples based on geographical location. Interestingly, the impact of long-term flood frequency is only significant in the South and the impact of long-term drought frequency is only significant in the North.

scholarly journals IMPLIKASI YURIDIS PERUBAHAN NAMA LAUT NATUNA UTARA TERHADAP ZONA EKOMONI EKSKLUSIF INDONESIA (ZEEI) DITINJAU DARI HUKUM INTERNASIONAL

2019 ◽  
Vol 18 (1) ◽  
pp. 40
Author(s):  
Rizky Hidayatullah ◽  
Chomariyah Chomariyah ◽  
Dita Birahayu
Keyword(s):  
South China Sea ◽  
Chinese Government ◽  
National Defense ◽  
Literature Study ◽  
Legal Research ◽  
Conceptual Approach ◽  
The North ◽  
External Impact ◽  
The Stability ◽  
The Impact

Indonesia changes the name of the sea in its Exclusive Economic Zone, which initially changed the name of the South China Sea to North Natuna Sea. The change in the name of the North Natuna Sea in Indonesia was protested by the Chinese government, given the abundant natural resources that made other countries especially China want to seize this region. Not only that, the North Natuna Sea is also one of the legal conflicts. The Indonesian government must increase awareness in terms of security and national defense in protecting sovereignty, especially in the North Natuna Sea. This study uses a normative juridical method and uses a legislative approach, a case approach, and a conceptual approach in this case literature study of library materials so that it can be called library legal research. The impact of the change in the name of the North Natuna Sea internally, the change in the map of Indonesia in the North Natuna Sea because this change can be implemented without external parties. External impact, Indonesia received recognition from other countries that the name of the Indonesian sea has changed its name. And efforts made by Indonesia to secure the stability of the North Natuna Sea.

scholarly journals Analysis of rock mass behavior with Empirical and Numerical method for the construction of diversion tunnel, Laos

2022 ◽  
Vol 1212 (1) ◽  
pp. 012028
Author(s):  
D J W Mboussa ◽  
S Sun
Keyword(s):  
Numerical Modeling ◽  
Rock Mass ◽  
Field Investigation ◽  
Geological Strength Index ◽  
Rock Masses ◽  
Mountain Area ◽  
Diversion Tunnel ◽  
The Stability ◽  
The Cost ◽  
The Impact

Abstract Tunneling construction in the mountain area is a challenge for engineers and geotechnicians because of instability due to the presence of discontinuities. The objective of this paper is the modeling of surrounding rock masses for the stability of the diversion tunnel to predict the behavior of rock masses during the excavation process for the Nam Phoun hydropower station project in Laos. Field investigation and laboratories test was realized; Empirical methods as Rock mass designation and Geological Strength Index were performed, rock masses were classified in three categories (RM-1, RM-2, and RM-3); in situ stresses were obtained from existing equations, numerical modeling was performed by the 2D plane strain finite element code Phase2 developed by Rocscience, using Generalized Hoek-Brown criterion for each type of rock masses. The results of numerical modeling show the strength zones of stresses and deformations around the tunnel and predict the instabilities around the tunnel during excavations processes. Thus, for all rock’s masses, it will be necessary to consider an analysis for the supports design before the excavation’s process. The findings of this study allow a clearer understanding of the importance to assess a predictive analysis of slope stability during the feasibility phase of a project by engineers to have an idea of instabilities and its significant in preventing the impact on the cost of the project.

Ice Loading of Jack-Up Platforms

2005 ◽  
Author(s):  
Alexandra Weihrauch ◽  
Joachim Berger ◽  
Marc Bartels
Keyword(s):  
Shallow Water ◽  
Structural Integrity ◽  
High Mobility ◽  
The North ◽  
Detail Design ◽  
Broken Ice ◽  
The Stability ◽  
Jack Up ◽  
The Impact ◽  
Analytical Approaches

The use of drilling platforms for exploration drillings in ice-covered shallow water is expected to increase in the future. Jack-up platforms (JU) are regarded to be most suitable for exploration drillings due to their high mobility, their facile transportation and installation. Although having proved their capability for harsh environments, e.g. in the North Sea, jack-ups have neither been especially designed for nor have been operated frequently in icy waters. The problems associated with the operation of jack-ups in ice waters are related to structural integrity as well as to operational limitations. One objective of the research project MATRA-OSE was to check the design of JU for exploration and oil production in ice-covered, shallow-water areas. The global stability of JU as well as local and global loads acting on a three-legged jack-up drilling unit were investigated. The design loads were determined by analytical approaches. Different ice load cases were defined as the basis for the detail design. These load cases include local loads on single members of the platform legs like chords or braces as well as global loads, which may act on one individual leg or on several legs of the platform. Vertical forces, which result from a change of the water level (up-surge and down-surge) in case ice sheets are frozen to the platform legs were considered. Also the impact of ice being jammed between the platform legs was investigated. It has been found out that the most critical load case results from the ice being jammed between the platform legs. It should therefore be tried in practice to avoid the ice jamming by proper ice management, as the large ice loads calculated for this scenario may result in problems for the stability of a JU. Ice breakers could be used to pre break the ice and should try to clear the site from broken ice pieces before it starts to accumulate.

Investigation of Helmet Based on Origami Structures

2017 ◽  
Author(s):  
Yang Yang ◽  
Chie Nara ◽  
Xiaoshi Chen ◽  
Ichiro Hagiwara
Keyword(s):  
Numerical Analysis ◽  
Natural Disaster ◽  
Energy Absorption ◽  
Mechanical Characteristics ◽  
Safety Performance ◽  
Experimental Results ◽  
Corrugated Cardboard ◽  
The Impact ◽  
Origami Engineering

The earthquake is a natural disaster which is irresistible and hard to forecast. In the earthquakes, the helmets play an important role in protecting the head of people. The traditional helmets have some disadvantages of storability. Even very few foldable helmets have been designed, the price of them are expensive. In order to overcome these disadvantages, and from the prospect of application to origami-engineering, we challenged to invent a foldable helmet based on origami structures. We designed the helmet using the origami structures of accordion cover origami structure/honeycomb origami structure and the low-priced energy absorption material of corrugated cardboard. Because the designed origami helmet is necessary to satisfy the safety performance, the impact FEM analyses are done to investigate the mechanical characteristics of the designed origami helmets. And the experiments are also done to confirm the safety performance of the designed helmets. Finally, the numerical analysis results are compared with the experimental results.

scholarly journals Assessing the stability of hydraulic structures to the impact of hazardous factors of hazardous natural phenomena

2020 ◽  
Vol 6 (4) ◽  
pp. 539-546
Author(s):  
A.V. Rybakov ◽  
◽  
E.V. Ivanov ◽  
D.S. Sibgatulina ◽  
G.S. Alyoshkin ◽  
...  
Keyword(s):  
Stability Index ◽  
The State ◽  
Earth Dam ◽  
Hydraulic Structures ◽  
Natural Phenomena ◽  
Earth Dams ◽  
The Creation ◽  
The Stability ◽  
Definition Of ◽  
The Impact

The article shows the procedure for determining the values of the stability index of hydraulic structures (earth dams). An approach to the creation of an engineering methodology for carrying out operational calculations for predicting the state of an earth dam under the influence of known characteristics of damaging factors of rapidly developing dangerous natural phenomena and man-made processes is presented. One of the directions of application of the proposed approach is shown — the definition of rational parameters for the protection of hydraulic structures and the development of a plan of measures to achieve them.

scholarly journals The recent tectonic stress field of the Amur region

2018 ◽  
Vol 9 (3) ◽  
pp. 1025-1037
Author(s):  
D. A. Safonov
Keyword(s):  
Stress Field ◽  
Seismic Activity ◽  
Tectonic Stress ◽  
Amur Region ◽  
Fault System ◽  
Tectonic Stress Field ◽  
Eastern Flank ◽  
The North ◽  
Tanlu Fault Zone ◽  
The Impact

The Amur region (Priamurie) is located in the NE part of the Amur lithospheric plate and its surrounding territories. Seismic activity is moderate in Priamurie, and the regional earthquakes, including the strongest ones, occur mainly in three seismic belts: Stanovoi (the zone of influence of the eastern flank of the Stanovoi fault), Yankan-Tukuringra-Soktakhan (the eastern flank of the Mongolia-Okhotsk lineament), and Turan-Selemzhinsky (from the Lesser Khingan to the north). The Sakhalin Branch of FRC GS RAS Catalogue of focal mechanisms of 57 regional earthquakes provide the data for a more precise estimation of the parameters of the crustal stress state in the study area. The Cataclastic Analysis Method (CAM) developed by Yu.L. Rebetsky (stage 1) was used to estimate the orientations of the main axes of the stress tensor and the Lode – Nadai coefficient. The analysis shows that the Upper Priamurie is dominated by shearing and compression with shearing. The Amur plate moves relative to the Aldan-Stanovoi block along the South Tukuringra and North Tukuringa faults to the east. Vertical shearing is predominant along the Dzheltulak fault and the western segment of the North Tukuringra fault. The NNE-trending compression takes place in the area located east of the quiescence zone of the Dzhagda ridge. Along the Mongolia-Okhotsk fault system, near the Sea of Okhotsk, the direction of compression changes to the northward one. The tectonic stress field along the Tanlu fault zone is inhomogeneous and comprises the alternating zones of horizontal compression and stretching with varying directions of the main stress axes. To the east of the band characterized by the maximum seismic activity, compression changes its direction to the southeast- and eastward. Probably, the impact of the oceanic subduction on the northern part of the Japan-Korean block begins to manifest itself in this part of the Amur region. The tectonic stress field reconstructed from the seismological data is consistent with the measurements of the modern crustal movements. The results of our study can prove useful for clarifying the tectonics of the region. 

Dietary Vitamin and Stability of Oral Anticoagulation: Proposal of a Diet with Constant Vitamin K1 Content

1997 ◽  
Vol 77 (03) ◽  
pp. 504-509 ◽  
Author(s):  
Sarah L Booth ◽  
Jacqueline M Charnley ◽  
James A Sadowski ◽  
Edward Saltzman ◽  
Edwin G Bovill ◽  
...  
Keyword(s):  
Dietary Intake ◽  
Vitamin K ◽  
High Performance ◽  
Case Reports ◽  
Food Composition ◽  
Dietary Guidelines ◽  
Dietary Vitamin ◽  
Vitamin K1 ◽  
The Stability ◽  
The Impact

SummaryCase reports cited in Medline or Biological Abstracts (1966-1996) were reviewed to evaluate the impact of vitamin K1 dietary intake on the stability of anticoagulant control in patients using coumarin derivatives. Reported nutrient-drug interactions cannot always be explained by the vitamin K1 content of the food items. However, metabolic data indicate that a consistent dietary intake of vitamin K is important to attain a daily equilibrium in vitamin K status. We report a diet that provides a stable intake of vitamin K1, equivalent to the current U.S. Recommended Dietary Allowance, using food composition data derived from high-performance liquid chromatography. Inconsistencies in the published literature indicate that prospective clinical studies should be undertaken to clarify the putative dietary vitamin K1-coumarin interaction. The dietary guidelines reported here may be used in such studies.

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