Swelling and Geotechnical Cartography of Saida

2009

The urban expansion and the increase in population led the urbanization to use the spaces "called at risks". The integration and the treatment of ground's movements constitute an important characteristic of the equilibrium established by nature.

Electronic Journal of …, 2010

The urban expansion and the increase in population led the urbanization to use the spaces "called at risks". The integration and the treatment of ground's movements constitute an important characteristic of the equilibrium established by nature. In the Saïda town (Algeria), many projects built on grounds with problems showed signs of degradations such as cracks in structures. These degradations led to the total destruction of the building. The principal causes of these disasters are: the nature of the expansive nature of soils and landslides, disaster phenomenon not considered in the first study of these constructions. The damage also touched road embankments, highways and foundations. In order to solve these problems, it was necessary to propose a geotechnical and risks map for the ZHUN EAST (ESSALAM city, Saïda), city which includes several yard of the soil with problems, using the geographical information systems (GIS/MapInfo). These tools enable us to express the perception of space and data processing, and consequently the cartography is carried out in an optimal way. These geotechnical and risks maps have a great part of importance in all levels of a study as information, working paper, alert, and especially is a tool for the decision-making aid, by expressing tendencies and orientations. They enabled us to give a field representing the active and potential movements with a hierarchy of risks to guide the developer and the engineer

Jordan Journal of Civil Engineering, 2009

The urban expansion and the increase in population led the urbanization to use the spaces called "at risk".The integration and the treatment of ground's movements constitute an important characteristic of the equilibrium established by nature.

E3S Web of Conferences, 2020

Bad choice of construction site or poor number or local geotechnical study test lead to construction ruin; hence the need to have a geotechnical map for each urban area, which will constitute a reference for urban planners. Urban geotechnics is the study of urban land environments to provide a scientific and technical database for rational urban development and land use planning. The aim of this work is to make an inventory of all potential geotechnical problems in the soil bounded by the urban perimeter of Beni Ensar city. So to characterize the soil many geotechnical tests carried out in the laboratory and in situ are analysed. The results of these geotechnical tests are represented geo-spatially using GIS software. The thematic maps obtained will constitute a reference to the planners and the various actors in this field to adapt development plans and types of buildings to the properties of the supporting soil. They will also allow the civil engineering laboratory to optimize the choice of the study method and the types of tests.

Sebinkarahisar Township which has been selected as study area is located between Black Sea and Central Anatolian Regions. Not only geological characters but also social life in the township had been affected by these two regions. History of the settlements goes back to early Hittite period. Even it was a province in the first years of Turkish Republic, today it is a township belongs to Giresun province. Landslide is one of the most effective natural disasters in the region. Due to wrong decisions of local authorities caused lots of damage, during the last two decades. Firmly some part of the city, which has the highest landslide risk, is prohibited for new settlement, and some studies (still at beginning level) had been carried out. In this study, morphology, geology, land cover, slope inclination, elevation of the region is investigated. 1:25000 standard topographic and 1:25000 standard geological maps are scanned and referenced geographically by using Topol software. Contours, settlements, roads, meadows, and forests are digitised from the geo-referenced topographic map and different geological formations are digitised from the geo-referenced geological map. These layers are saved as blocks. By extrapolating method, the third dimensions of these blocks are reedited from the contours using QuickSurf module of AutoCad software. These blocks are added to ArcView software and digital elevation model is produced. Also the reasons of the occurred landslides are investigated and they are added to ArcView software. Finally the region classified by the amount of their potential landslide risks and risk map is produced. The aim of this study is; producing a landslide risk map and giving some precautions before the planning of the settlement.

Bulletin de la Société de Géographie d'Egypte

Abha Urban is located in Asir region, southwest of Saudi Arabia. Geomorphology is one of the most influential controls in urban planning, which gives an idea about the variations in landscape/landforms and indirectly facilitates in evaluating the resources of an area. for detailed study, multi-temporal satellite remote sensing imageries and ArcGIS were used to compile and create database that provided a visual and historical perspective of the urban expansion practiced in the study area since 1970 to 2018. the different thematic map such as land use change pattern analysis, topography, and geomorphology highlight the profound changes to the landscape/landform that have incrementally developed over time. Through studying geological structures, analyzing the height and slope of the surface -topography of the surface -and their impact on the urban expansion of the region, this research illustrates how geomorphological expert knowledge can be integrated in a GIS and RS for the evaluation of Geomorphological hazards. Geomophological hazard assessment is an important component of natural hazard risk assessment. This paper presents GIS-based geomorphological hazard mapping in Abha urban, this includes the integration of published geological, geomorphological, and other data into GIS, and generation of new map products, combining governmental concerns and legal restrictions. Detailed geomorphological hazard maps for flooding zones and earth movement potential, further the paper illustrates the application of vulnerability maps dealing with the effect of hazard on urban areas, these maps can help to initiate appropriate measures to mitigate the probable hazards in the area. And trying to propose appropriate solutions for urban expansion in the light of the Geomorphological hazard's studies. [Bul. Soc. Géog. d'Égypte, 2019, 92: 53-75].

Engineering Geology, 2010

Urban geology provides information on urban geologic environments as a scientific basis for planners and engineers for rational land use planning and urban development. Such mapping can be classified in terms of purpose, content and scale. In this study, procedure for preparation of engineering geological mapping in Tunis City (Tunisia) is given, as a case study. The main restricting factors for urban development: such as lithology; topography; slope; seismotectonic; water table depth; flooding susceptibility and seismic-induced effects were considered in the preparation of maps. All these information layers were manipulated using the Geographic Information System (GIS), and they were then combined to produce uniform engineering geological maps. Results are illustrated as a suitability map for construction in the study area. Consequently, the study area was categorized into four different zones as: (1) a high region with potential risk of superficial perturbation; (2) a low and flat zone with flooding risk; (3) a low zone with flooding and probability of sliding risk; (4) a region with mud levels and settlement risk.

This study aimed to analyze the land survey maps and existing data to determine the vulnerable areas of the Kaynaşlı districts at risk in terms of natural disaster, as Kaynaşlı is located in a first-degree seismic zone. This three-phase study analyzed geological-geotechnical survey reports via the geographic information system (GIS) and applied them to Kaynaşlı Municipality in Düzce Province (Turkey). First, a non-digital raster suitability map based on a 2005 Kaynaşlı Municipality report was digitized via ArcGIS and used to conduct natural disaster risk analyses of Kaynaşlı. The 2112 buildings covered by the suitability map were then scanned and inventory information generated for each. Finally, using ArcGIS software, the digitized inventory information was superimposed on the suitability map. In Kaynasli, a total 2112 buildings were examined via street screening and their risk status was identified in terms of the terrain. Disaster and risk ratios were calculated and vulnerable areas were pinpointed. All the information obtained from the results of the analyses was shared with the local authorities. According to the physical inventory information, a sustainable data bank was created with the purpose of facilitating the necessary measures for disaster preparedness to be taken by the local authorities in Kaynaşlı. The model of this Kaynaşlı natural disaster risk study could be applied in other communities to assist in identifying vulnerable settlement areas.

Modelling in Civil Environmental Engineering

The region of Ain-Témouchent is a seismic zone; its land is predominately agricultural and shows complex structures, with many problems linked to the development of urbanized areas; these problems are directly or indirectly related to the geotechnical conditions of soil. The purpose of the present research is to build a database from the different measurements carried out in the region, and to conduct tests in places where information is not available in order to consider the entire perimeter of the study area. Once the database is completed, an analysis of all the data will be carried out using a numerical tool in order to establish the geotechnical map of the city. This map will certainly allow all decision-makers and designers to have clear and precise information when proposing or designing new structures. The geotechnical mapping of Ain-Temouchent soils based on 178 observations divided these soils into ten groups. Eight of them according to the Unified Soil Classification Syst...

The present paper submits a set geotechnical maps for the area of An-Najaf city, by using contour lines to represent the different geotechnical properties of the soil. The present research work is very important step toward preparing a geotechnical database for this region, to complete the geotechnical database over all the country, (Iraq). Using such a database is very important in geotechincal investigation, reconnaissance phase, of construction projects. Within this phase of site investigation, numbers, depths and locations of the boreholes needed, will be determined. A well known commercial software (SURFER 11), was used to produce the all the contour maps of geotechnical properties presented herein. A forty nine (49) contour maps were produced to cover the variations, within the geotechnical properties of the soil, to produce realistic description to these soil properties. Both Google maps and Universal Transverse Mercator coordinate system (UTM) have been used in the contour maps for easy use.