Strutted excavation in soft soil incorporating a Jet-Grout Base Slab: Analysis considering the consolidation effect

• Type: Article in International Scientific Journal
• Date: 2013

Authors

José Leitão Borges (Author) FEUP; Ricardo Gomes Pinto (Author) FEUP

Journal

Title: Geotechnical and Geological Engineering

Vol. 31 No. 2

Pages: 593-615

ISSN: 0960-3182

Indexing

Scopus

INSPEC

Scientific classification

FOS: Engineering and technology > Civil engineering

CORDIS: Technological sciences > Engineering > Civil engineering

Other information

Abstract (EN): The influence of the consolidation on a strutted excavation in soft soil is analysed using a computer code based on the finite element method. A base jet-grout slab is considered in order to improve stability against bottom heave failure and minimize wall displacements. The numerical model incorporates the Biot consolidation theory (coupled formulation of the flow and equilibrium equations) with soil constitutive relations simulated by the p¿q¿h critical state model. Special emphasis is given to the analysis, during and after the construction period, of the pore pressures, shear stresses, stress levels and displacements in the ground, as well as strut compression loads, wall displacements and bending moments, earth pressures on the wall faces and compression loads and bending moments on the jetgroutslab. The safety factor against bottom heave is also evaluated from the finite element analysis considering formulations of the critical state soil mechanics, and also compared to values obtained with traditional methods that use limit equilibrium approach and bearing capacity fundamentals.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 23