Abstract
The Kenitra city belongs to the Rharb-Mamora domain, which is affected by a continuous subsidence from the Middle Vindobonien to the present day. The sedimentary cycle of the tertiary era ends at the Pliocene, characterized by regressive character deposits identified in outcrop at the margins of the basin: They are conglomerates in the North, yellow sands in the East, sands and sandstone in the South-East. These sandy deposits vary from more or less clayey sand to greying sand, with the appearance of a very loose sand layer, at varying depths. It is with this directive that the objective of this article is to define the risks, which may affect the works built on this soil, and also determine the actions to be taken to control these risks. As a first step, an experimental approach was carried out, including in situ and laboratory tests in order to identify these formations and define their mechanical behavior. Then, the results of geotechnical survey were analyzed and exploited in calculations of bearing capacity, settlement, liquefaction,… eventually resulting in the necessity of treatment and reinforcement of this soil. These approaches have shown that there are several soil reinforcement techniques, the choice of which depends on the granulometry of soil and the cost of project.
Highlights
Liquefaction is one of the most important and complex phenomenon in the dynamics of loose soil
The major repercussions occasioned in Japan in 1964 by the Nigata seism, have stimulated several research to apprehend the risk of liquefaction and evaluate its consequences according to a given seismic intensity (Seed, 1971; Robertson & Wride, 1998; Boulanger & Idriss, 2008; Moss et al, 2006)
The Kenitra city is clearly invaded by sandy deposits varying from more or less clayey sand to grazed sand, with the appearance of a very loose layer of sand at varying depths
Summary
Liquefaction is one of the most important and complex phenomenon in the dynamics of loose soil. This phenomenon is responsible for excessive damage to building foundations. The major repercussions occasioned in Japan in 1964 by the Nigata seism, have stimulated several research to apprehend the risk of liquefaction and evaluate its consequences according to a given seismic intensity (Seed, 1971; Robertson & Wride, 1998; Boulanger & Idriss, 2008; Moss et al, 2006). Several empirical approaches based, in particular, on the results of in situ tests, have been developed in order to analyze the liquefaction potential of soil. The Kenitra city is clearly invaded by sandy deposits varying from more or less clayey sand to grazed sand, with the appearance of a very loose layer of sand at varying depths. From which it is necessary to improve the characteristics of these sands by choosing the optimal solution and the most suitable for this type of soil
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