Pressure grouting of microfine cements in soils: micromechanical processes

Katia Boschi; Matteo Oryem Ciantia; Claudio Giulio Di Prisco

Pressure grouting of microfine cements in soils: micromechanical processes

Katia Boschi (Lead / Corresponding author)
, Matteo Oryem Ciantia
, Claudio Giulio Di Prisco

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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Abstract

The injection of microfine cements in soils is a common stabilization technique for improving both mechanical and hydraulic ground properties, but the micromechanical processes locally occurring are not yet understood and hence rightly modelled. In this work, the microfine cement injection is micromechanically analysed, soil grains-grout local interaction is accounted for by employing a discrete element method code, where the microfine cement particles are simulated by means of tiny rigid frictionless spheres. To simulate injection, these spheres are initially put in place in a tube, then pressurised by means of a servo control procedure and, finally, allowed to dynamically flow into a granular cubic specimen. Numerical analyses, considering different sand-grout particle diameter ratios, sand initial states and injection pressures, are performed. Numerical results reveal the formation of three grout diffusion processes in the granular medium: two mechanisms associated with soil grain dislocations (cavity expansion and claquage) and seepage of microfine cement within soil pores without any change in the initial soil microstructure.

Original language	English
Title of host publication	Proceedings of the 20th International Conference on Soil Mechanics and Geotechnical Engineering, Sydney 2021
Place of Publication	Sydney
Publisher	Australian Geomechanics Society
Pages	621-626
Number of pages	6
ISBN (Electronic)	9780994626141
Publication status	Published - May 2022
Event	20th International Conference on Soil Mechanics and Geotechnical Engineering - Sydney, Australia Duration: 1 May 2022 → 5 May 2022 https://icsmge2022.org/

Conference

Conference	20th International Conference on Soil Mechanics and Geotechnical Engineering
Country/Territory	Australia
City	Sydney
Period	1/05/22 → 5/05/22
Internet address	https://icsmge2022.org/

Keywords

Soil mechanics
Numerical Analysis
Micromechanics
DEM
Grouting

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title = "Pressure grouting of microfine cements in soils: micromechanical processes",

abstract = "The injection of microfine cements in soils is a common stabilization technique for improving both mechanical and hydraulic ground properties, but the micromechanical processes locally occurring are not yet understood and hence rightly modelled. In this work, the microfine cement injection is micromechanically analysed, soil grains-grout local interaction is accounted for by employing a discrete element method code, where the microfine cement particles are simulated by means of tiny rigid frictionless spheres. To simulate injection, these spheres are initially put in place in a tube, then pressurised by means of a servo control procedure and, finally, allowed to dynamically flow into a granular cubic specimen. Numerical analyses, considering different sand-grout particle diameter ratios, sand initial states and injection pressures, are performed. Numerical results reveal the formation of three grout diffusion processes in the granular medium: two mechanisms associated with soil grain dislocations (cavity expansion and claquage) and seepage of microfine cement within soil pores without any change in the initial soil microstructure.",

keywords = "Soil mechanics, Numerical Analysis, Micromechanics, DEM, Grouting",

author = "Katia Boschi and Ciantia, \{Matteo Oryem\} and \{Di Prisco\}, \{Claudio Giulio\}",

note = "{\textcopyright}2022 Australian Geomechanics Society.; 20th International Conference on Soil Mechanics and Geotechnical Engineering ; Conference date: 01-05-2022 Through 05-05-2022",

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booktitle = "Proceedings of the 20th International Conference on Soil Mechanics and Geotechnical Engineering, Sydney 2021",

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}

Boschi, K, Ciantia, MO & Di Prisco, CG 2022, Pressure grouting of microfine cements in soils: micromechanical processes. in Proceedings of the 20th International Conference on Soil Mechanics and Geotechnical Engineering, Sydney 2021. Australian Geomechanics Society, Sydney, pp. 621-626, 20th International Conference on Soil Mechanics and Geotechnical Engineering, Sydney, Australia, 1/05/22.

Pressure grouting of microfine cements in soils: micromechanical processes. / Boschi, Katia (Lead / Corresponding author); Ciantia, Matteo Oryem; Di Prisco, Claudio Giulio.
Proceedings of the 20th International Conference on Soil Mechanics and Geotechnical Engineering, Sydney 2021. Sydney: Australian Geomechanics Society, 2022. p. 621-626.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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AU - Ciantia, Matteo Oryem

AU - Di Prisco, Claudio Giulio

PY - 2022/5

Y1 - 2022/5

N2 - The injection of microfine cements in soils is a common stabilization technique for improving both mechanical and hydraulic ground properties, but the micromechanical processes locally occurring are not yet understood and hence rightly modelled. In this work, the microfine cement injection is micromechanically analysed, soil grains-grout local interaction is accounted for by employing a discrete element method code, where the microfine cement particles are simulated by means of tiny rigid frictionless spheres. To simulate injection, these spheres are initially put in place in a tube, then pressurised by means of a servo control procedure and, finally, allowed to dynamically flow into a granular cubic specimen. Numerical analyses, considering different sand-grout particle diameter ratios, sand initial states and injection pressures, are performed. Numerical results reveal the formation of three grout diffusion processes in the granular medium: two mechanisms associated with soil grain dislocations (cavity expansion and claquage) and seepage of microfine cement within soil pores without any change in the initial soil microstructure.

AB - The injection of microfine cements in soils is a common stabilization technique for improving both mechanical and hydraulic ground properties, but the micromechanical processes locally occurring are not yet understood and hence rightly modelled. In this work, the microfine cement injection is micromechanically analysed, soil grains-grout local interaction is accounted for by employing a discrete element method code, where the microfine cement particles are simulated by means of tiny rigid frictionless spheres. To simulate injection, these spheres are initially put in place in a tube, then pressurised by means of a servo control procedure and, finally, allowed to dynamically flow into a granular cubic specimen. Numerical analyses, considering different sand-grout particle diameter ratios, sand initial states and injection pressures, are performed. Numerical results reveal the formation of three grout diffusion processes in the granular medium: two mechanisms associated with soil grain dislocations (cavity expansion and claquage) and seepage of microfine cement within soil pores without any change in the initial soil microstructure.

KW - Soil mechanics

KW - Numerical Analysis

KW - Micromechanics

KW - DEM

KW - Grouting

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BT - Proceedings of the 20th International Conference on Soil Mechanics and Geotechnical Engineering, Sydney 2021

PB - Australian Geomechanics Society

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Y2 - 1 May 2022 through 5 May 2022

ER -

Pressure grouting of microfine cements in soils: micromechanical processes

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