Volume 43, N. 2

April-June 2020

Bottom Reinforcement in Braced Excavations: Coupled Analysis and New Method for Basal-Heave Stability Study


Volume 43, N. 2, April-June 2020 | PDF (22 downloads)


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: basal-heave stability, consolidation, coupled analysis, jet-grout slab, soft soil, strutted excavation,

Submitted on August 07, 2019.
Final Acceptance on May 26, 2020.
Discussion open until September 30, 2020.
DOI: 10.28927/SR.432199