Scholarly record
CHANGE OF FOUNDATION TYPE DUE TO EXCAVATION DEWATERING: A CASE STUDY
Abstract
Engineering-geological and hydrogeological investigations play an important role in the selection and design of dewatering methods for construction excavations and the choice of the foundation type of the designed buildings. This paper presents a case study from a construction site in Sofia city, situated in the southernmost part of the Sofia graben and near by a river terrace. The project involves the construction of a five-story residential building with one underground level. The groundwater table was established at a depth of 4.80 m below the ground surface within a gravel layer of alluvial origin. Due to the proximity of the Vladayska River, groundwater level seasonal changes of approximately 0.50 m were expected. The planned foundation level at 4.55 m lies very close to the groundwater table and its possible fluctuations, which requires excavation dewatering and reliable foundation structure. The paper presents the implemented dewatering solution and the resulting modification of the foundation design, changing the initially planned mixed system of strip foundations and foundation slab to a single continuous raft foundation.
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