Soil-structure interaction due to tunnelling in soft ground, an equivalent solid approach

Losacco, Nunzio; Callisto, Luigi; Burghignoli, A.

doi:10.1201/9781315616995-66

Cited by 7 publications

(2 citation statements)

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“…Gaussian curves are frequently used to describe empirically tunneling induced transverse surface and subsurface vertical displacements in preliminary assessment (Mair and Taylor 1997). Thanks to their robustness, Gaussian curves are also used to evaluate the reliability of numerical outcomes (Losacco et al 2016;Yiu et al 2017). Alternatively, engineers may implement different empirical curves or analytical solutions (Pinto and Whittle 2014;Vorster et al 2005).…”

Section: Greenfield Settlementsmentioning

confidence: 99%

Role of Shear Deformability on the Response of Tunnels and Pipelines to Single and Twin Tunneling

Franza

Viggiani

2021

J. Geotech. Geoenviron. Eng.

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Tunneling can compromise the safety and the serviceability of existing buried infrastructure because of settlements, crack openings, dislocations, and material strains. A continuum-based soil-structure interaction model, implementing an equivalent Timoshenko beam, is used to evaluate the excavation-induced settlements and longitudinal deformations of existing tunnels and pipelines.Both single and twin tunneling scenarios are examined. The shear flexibility of shield and sprayed concrete lining tunnels may be significant. This increases tunneling-induced settlements while it decreases tilt, curvature and associated bending moment, with implications for optimal monitoring installations. In this work, a new dimensionless shear factor is introduced, governing the relative importance of bending and shear deformations and accounting for the settlement trough width. This can be used to evaluate if a pure-bending, shear-dominated, or mixed deformation mode should be expected. Design charts to assess existing infrastructure affected by either single or twin tunnels are proposed.

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Section: Greenfield Settlementsmentioning

confidence: 99%

Role of Shear Deformability on the Response of Tunnels and Pipelines to Single and Twin Tunneling

Franza

Viggiani

2021

J. Geotech. Geoenviron. Eng.

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“…To better represent the stiffness effects, Pickhaver et al (2010) and Finno et al (2005) suggested that buildings could be modelled with equivalent Timoshenko and laminated beams with both cross-sectional bending stiffness E I and shear stiffness G A s , whereas Losacco et al (2016) used anisotropic equivalent solids. To isolate the contributions of shear and bending stiffness, Franza et al (2020) modified the relative stiffness parameter η from Timoshenko beam theory as:…”

Section: Deflection Ratios Equivalent Stiffness and Relative Stiffnmentioning

confidence: 99%

Response of Framed Buildings on Raft Foundations to Tunneling

Franza

Marshall

2020

J. Geotech. Geoenviron. Eng.

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This paper investigates the response of framed buildings on raft foundations to tunnel construction using geotechnical centrifuge testing. Five framed building models were considered and the influence of building configuration, weight, eccentricity, and soil density were evaluated. Soil and foundation displacements, frame deformed shape, maximum structure deformation parameters (deflection ratios and angular distortions), and associated modification factors are illustrated. Results indicate that, unlike equivalent isotropic plates, framed buildings primarily exhibit shear behavior and a semi-flexible response. Building deformed shapes indicate that angular/shear distortions (considering bay slope and local tilt) are more appropriate for quantifying framed building distortions than deflection ratios. A relative stiffness parameter is suggested to relate maximum angular distortions to greenfield settlement slope. Moreover, the efficiency of available relative stiffness parameters for the deflection ratio modification factors is confirmed. Limitations of the equivalent plate approach and practical implications of the results for framed buildings are discussed.

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Tunnelling-Induced Displacements and Damage on Framed Structures: Comparison Between Numerical Models

Boldini

Losacco

Franza

et al. 2021

Lecture Notes in Civil Engineering

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Soil-structure interaction due to tunnelling in soft ground, an equivalent solid approach

Cited by 7 publications

References 0 publications

Role of Shear Deformability on the Response of Tunnels and Pipelines to Single and Twin Tunneling

Role of Shear Deformability on the Response of Tunnels and Pipelines to Single and Twin Tunneling

Response of Framed Buildings on Raft Foundations to Tunneling

Tunnelling-Induced Displacements and Damage on Framed Structures: Comparison Between Numerical Models

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