Permeation grouting of low-permeability silty sands with colloidal silica

Liu, Gang; Zhao, Mingzhi; Wang, Tengfei; Connolly, David; Cai, Yuquan; Jiang, Junsong; Wen, Binghai

doi:10.1016/j.cscm.2023.e02327

Cited by 3 publications

(2 citation statements)

References 34 publications

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“…Sand layers, common in marine underground engineering, pose significant geological challenges to subsea tunnel construction due to their low cementation strength and poor self-stabilization. − Grouting, a prevalent technique to mitigate geological disasters in sand layers, effectively creates a reinforcement ring. − However, the marine environment, characterized by a high concentration of corrosive ions in seawater, differs significantly from terrestrial environments. These ions’ long-term erosion critically undermines the physical and mechanical properties of grouting reinforcement, compromising its durability and reducing the subsea tunnels’ safe operational lifespan. − Consequently, investigating the evolution of sand grouting reinforcement’s physical properties in a seawater erosion environment holds substantial significance for geotechnical engineering design.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study of Mechanical Properties of Sand Layer Grouting Reinforcement under Seawater Erosion

Wang,

Guo,

et al. 2024

ACS Omega

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Grouting serves as an effective method for mitigating geotechnical disasters in subsea tunnels. However, current theories and designs, primarily based on terrestrial tunnel contexts, seldom address the long-term effects of seawater ion erosion on reinforcement. An improved sand permeation grouting simulation test system was employed to examine the mechanical property evolution of sand layer grouting reinforcement under seawater erosion utilizing various grout types. The mechanical properties of grouting reinforcement, under varying curing conditions, were analyzed using a uniaxial compression test, permeability test, and scanning electron microscope (SEM) test. Test results indicate that seawater curing conditions initially enhance the strength and impermeability of grouting reinforcement; however, prolonged curing diminishes these mechanical benefits. The onset of this process occurs significantly sooner in cement-sodium silicate grout (28–56 days) compared to cement grout (56d to 90d). For the cement grouting reinforcement, the deformation modulus increases over time, albeit at a decreasing rate. The deformation modulus of cement-sodium silicate grouting reinforcement follows an increase-decrease-increase pattern, correlating with the volume ratio over time. The decline in mechanical properties of grouting reinforcement during the test’s mid to late stages under seawater conditions results from the interplay between erosive ions, which inhibit mechanical growth and accelerate deterioration.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of Mechanical Properties of Sand Layer Grouting Reinforcement under Seawater Erosion

Wang,

Guo,

et al. 2024

ACS Omega

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Experimental Study on the Diffusion Law of Horizontal Grouting in Shallow Sand Gravel Layer

Liu,

Xie,

Zhang

et al. 2024

KSCE J Civ Eng

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Stabilisation of subsoil using colloidal silica beneath shallow foundation: a case study

Birid,

Varak

2024

Proceedings of the Institution of Civil Engineers - Ground Impr

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Shallow foundations are commonly used to support various equipment in industrial projects. If the subsoil is too weak to withstand the equipment loads, the settlement or tilting of the foundations takes place. To avoid further distress to such foundations, weak soil beneath the damaged foundation is required to be strengthened. This paper presents a similar case study wherein the strengthening of subsoil was performed beneath the shallow foundations which experienced settlement and tilting beyond the permissible limits due to the presence of weak subsoil. The stabilisation of soil was performed using injection grouting with colloidal silica-based chemical grout to prevent further settlement and tilting of foundations. The particulars of the chemical stabilisation program, injection methodology, chemical consumption, field trials, and laboratory test results are explicated in this paper with the details of post rectification performance of the test foundation. The properly executed injection grouting using chemical components was observed to be an effective measure to stabilise the subsoil by enhancing its engineering properties to a certain extent. The key factors that can affect the performance of colloidal silica-based chemical and precautions to be considered during soil stabilisation are also discussed in this paper.

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Permeation grouting of low-permeability silty sands with colloidal silica

Cited by 3 publications

References 34 publications

Study of Mechanical Properties of Sand Layer Grouting Reinforcement under Seawater Erosion

Study of Mechanical Properties of Sand Layer Grouting Reinforcement under Seawater Erosion

Experimental Study on the Diffusion Law of Horizontal Grouting in Shallow Sand Gravel Layer

Stabilisation of subsoil using colloidal silica beneath shallow foundation: a case study

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