Bottom Reinforcement in Braced Excavations: Coupled Analysis and New Method for Basal-Heave Stability Study
- 30 June 2020
- journal article
- research article
- Published by ABMS - Brazilian Association for Soil Mechanics and Geotechnical Engineering in Soils and Rocks
- Vol. 43 (2), 199-217
- https://doi.org/10.28927/sr.432199
Abstract
Soil-cement bottom reinforcement is commonly used in braced excavations in soft soils, so that ground displacements can be reduced and excavation safety against bottom failure increase. However, there is a lack of studies in the literature regarding such reinforced excavations in which the stability against bottom heave is analysed through mechanical-hydraulic coupled modelling. In the paper, in order to contribute to overcome such deficiency, a braced excavation in soft soil, incorporating a jet-grout base slab, is analysed. A finite element code, which incorporates the above-mentioned features, is used and a new method for basal stability analysis - which utilizes the numerical results obtained by the finite element code - is proposed and applied. Two cases of the same problem, with and without soil-cement bottom slab, are compared.Keywords
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