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Master Thesis

Soutènements et fondations d'une tour reposante sur un sol médiocre

Abstract : This thesis project consists firstly to make a soil investigation using different means of recognition of soil, to present and study the risk of soil liquefaction and treatment methods, designing shoring, dewatering and foundation in order to check the global stability of the soil-structure system during excavation and foundation construction, where a tower of 20 floors with 4 basements is to be built on a poor quality soil in presence of a water table. A soil investigation should be made in order to come up with the geological section of the lot, this soil investigation was done by the description of the various tests in two different methods: geotechnical and geophysical. The geotechnical method was based on the analysis of an existing soil report and the observation of a nearby excavation. As for the geophysical method, the test was done by a previous soil project as assigned by NDU University, the Horizontal to Vertical Spectrum Ratio “HVSR” technique was used to derive the resonance frequency of the soil which led to identify the depth to the bed rock present in the lot. In order to ensure the stability of the 13m deep excavation, it was found that the most economical and convenient shoring system consists of spaced piles with anchors and shotcrete. After studying all the possible dewatering methods available in Lebanon, it was found that the most practical dewatering system for this project consists of 3 ditch open pumping, noting that the water will seep from the base of the excavation since the shoring system will serve as a cut-off membrane. Finally, the foundation system required of a tower sitting on a soil in the presence of a water table was found to be a raft foundation.
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Master Thesis
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Aline Bechaalany. Soutènements et fondations d'une tour reposante sur un sol médiocre . Structures. 2015. ⟨dumas-01664693⟩

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