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Risk preventive plan in seismic-affected zones: the case study of Chlef City (Algeria)

Euro-Mediterranean Journal for Environmental Integration, ISSN: 2365-7448, Vol: 9, Issue: 4, Page: 1959-1969
2024
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Article Description

Ground movements, such as settlement, landslides, and liquefaction, are often recorded during seismic events. A reliable approach to risk management involves the development of a preventive plan. This includes a cartographic map providing urban planners and engineers with the available techniques for reinforcing vulnerable soils that support important structures or are reserved for future urbanization. This indispensable document is currently attracting attention from researchers in Algeria, where the northern part is highly prone to seismic activity. Therefore, the aim of this study is to develop a map using Geographic Information System tools for managing risks associated with earthquake-induced ground movements in Chlef City (Algeria), a region renowned for its seismic activity and history of major earthquakes experienced during the last century. The methodology employed in creating the map draws on the findings of laboratory experiments and examines existing seismic micro-zoning study. Four soil reinforcement processes that are regularly used in seismic zones are implemented, namely densification, geotextiles, cement columns injection, and stone columns. Based on the experimental outcomes and the seismic hazard level, multiple reinforcement techniques are allocated to each area within the city perimeter, enabling local risk managers to select the most appropriate processes according to the local availability. In addition, the developed plan provides recommendations for additive measures that should be considered for more effectiveness. Thus, the developed map and the accompanying recommendations together constitute a useful preventive plan against induced ground movements in Chlef City. It also provides a technical guide for urban development planning and seismic risk management measures.

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