Increasing the passive resistance of deep excavations in very soft soils to mitigate ground movements through centrifuge modelling

Panchal, J.P.; McNamara, A. M.

doi:10.1201/9780429321559-48

Geotechnical Aspects of Underground Construction in Soft Ground 2021

DOI: 10.1201/9780429321559-48

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Increasing the passive resistance of deep excavations in very soft soils to mitigate ground movements through centrifuge modelling

J.P. Panchal¹,

A. M. McNamara²

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2023

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“…The model was placed on the centrifuge swing (City, University of London has access to an Acutronic 661 and a description of the main features can be found in Panchal, 2018) and accelerated to 100g. The model was kept at this acceleration until the clay had reached hydrostatic equilibrium indicated by the stable readings from the aforementioned pore-water pressure transducers.…”

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Surface settlements arising from elliptical shaft excavation in clay

Goodey

Divall

2023

International Journal of Physical Modelling in Geotechnics

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Shafts are frequently constructed to allow access to subsurface infrastructure and the resulting excavation generally deep and narrow. Shafts may be constructed using a variety of methods and plan forms dependent on ground conditions and intended use. An axisymmetric (cylindrical) geometry is often preferred due to the relatively simple structural analysis, construction method and for a number of approaches that are available to estimate the ground movements around such an excavation. In certain cases, particularly when there is restricted space both above and below surface, non-circular shafts could be a preferred solution. The assessment of surface movements around non-circular shafts is difficult as little information exists and there are few empirical prediction methods available. In this study, a series of centrifuge tests have been conducted to investigate the effects of modifying the cross-sectional profile of a shaft (i.e. circular in plan compared with elliptical). Analysis of measurements obtained from centrifuge tests undertaken at City, University of London's geotechnical centrifuge facility are presented and compared with existing predictive methods. An addendum to the empirical equations and procedures for predicting surface settlements arising from circular shafts is presented to allow for the assessment of movements around elliptical shafts in clay.

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mentioning

confidence: 99%

Surface settlements arising from elliptical shaft excavation in clay

Goodey

Divall

2023

International Journal of Physical Modelling in Geotechnics

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Increasing the passive resistance of deep excavations in very soft soils to mitigate ground movements through centrifuge modelling

Cited by 1 publication

References 0 publications

Surface settlements arising from elliptical shaft excavation in clay

Surface settlements arising from elliptical shaft excavation in clay

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