Three-dimensional base stability of rectangular excavations in soft soils using FEM

Faheem, Hamdy; Cai, Fei; Ugai, Keizo

doi:10.1016/j.compgeo.2004.02.005

Cited by 50 publications

(26 citation statements)

References 15 publications

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“…A second category of methods for calculating basalheave stability is based on finite-element analyses (Faheem et al, 2003;Faheem et al, 2004;Cai et al, 2002) with formulations that are similar to those of the finite-element methods for slope stability analysis, widely accepted in the literature for many years.…”

Section: Preamblementioning

confidence: 99%

“…Another important issue that needs to be analysed for braced excavation projects in soft clays is the basal-heave stability, for the lateral earth support system is often controlled by stability requirements. Different methods have been used in practice to perform stability calculations for braced excavations, which basically are based on either limit equilibrium approach (Terzaghi, 1943;Bjerrum & Eide, 1956;Clough & Hansen, 1981;O'Rourke, 1992;Su et al, 1998;Ukritchon et al, 2003) or finite-element analysis (Faheem et al, 2003;Faheem et al, 2004;Cai et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

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

Borges¹,

Santos²

2020

S&R

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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.

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Section: Preamblementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Borges¹,

Santos²

2020

S&R

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“…The shear strength reduction method (SSRM) has been used to check basal heave stability. This method adopts an elastoplastic constitutive relationship for the soil, and basal heave failure curves of circular excavation have been obtained [22][23][24][25][26]. Meanwhile, a centrifuge model and full-scale field test have been introduced for the stability of circular excavations.…”

Section: Introductionmentioning

confidence: 99%

Axisymmetric Arc Sliding Method of Basal Heave Stability Analysis for Braced Circular Excavations

Zhang

et al. 2018

Symmetry

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On the basis of the circular arc sliding model of the limit equilibrium method, an axisymmetric arc sliding method (AASM) is proposed to analyze the basal heave stability of braced circular excavations. The proposed method considers the stiffness of the enclosure structure and spatial effects. The AASM was applied to check basal heave stability in a design example and provided results that were more reasonable than those obtained using other methods. The radii effects in theory and numerical simulation, and the enclosure structure stiffness effects on the basal heave stability safety factor were discussed. Additionally, the effects of the embedded depth on the basal heave stability of a braced circular excavation were analyzed. The safety factor of basal heave stability for a braced circular excavation will be larger when calculated with the AASM than when calculated with the circular arc sliding method, and the optimized embedded depth of the enclosure structure may therefore be reduced by 4∼5 m to lower the cost of the enclosure structure.

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“…The lifting of bottom of the excavation depends on its depth and sizes in plan, texture and mechanical characteristics of soils , the presence of enclosing structures of the excavation, the duration of work on the excavation and the construction of the building, etc. [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, numerical methods for determining the SSS of a soil massif with the help of specialized geotechnical software using the finite element method (FEM) [2,3,9] and various elastic and elastic-plastic models of the soil base have become increasingly popular [10,11,12,13,14,15]. Nevertheless, analytical methods of calculation and at the moment have not lost relevance, since they are most fully developed in regulatory documents [5,6] for almost all types of difficult engineering-geological conditions, are well confirmed by experimental data [16,17] and are one of the ways verification of the results of numerical calculation methods.…”

Section: Introductionmentioning

confidence: 99%

Determination of non-uniform settlements caused by decompression of soil in the excavation

Yarkin

Kukhar

2018

MATEC Web Conf.

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The article is offered refined and simplified methods for determination of non-uniform settlements caused by decompression of soil in the excavation. The results of the calculations executed taking into account the done suggestions and in the program Plaxis are presented. The results of the calculations are compared with the results of experimental observations given in the literature. The influence of the excavation parameters on the non-uniform settlements is investigated. Present a proposal for adjustment of the conditions, which require consideration of soil decompression in the excavation.

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Three-dimensional base stability of rectangular excavations in soft soils using FEM

Cited by 50 publications

References 15 publications

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

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

Axisymmetric Arc Sliding Method of Basal Heave Stability Analysis for Braced Circular Excavations

Determination of non-uniform settlements caused by decompression of soil in the excavation

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