Pilot-scale modeling of colloidal silica delivery to liquefiable sands

Hamderi, Murat; Gallagher, Patricia M.

doi:10.1016/j.sandf.2014.12.011

Cited by 34 publications

(16 citation statements)

References 12 publications

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“…They believe that the maximum transport distance for CS ranges from 2.5 m to 4 m due to the higher density of CS solutions compared with pore water [67,68]. To further investigate the sinking behavior and horizontal movement of CS grouting, they developed a 10 m 3 pilot-scale box model [69], as shown in Figure 13. The loose sand layer was placed in the box model by freely pouring sand onto water.…”

Section: Injection Ratementioning

confidence: 99%

“…A low viscosity status should be sustained to facilitate CS horizontal transport. However, once CS arrives at the targeted location, sinking and deposition will occur on the condition of low viscosity [66][67][68][69][70]. Therefore, gel time is difficult to control in the conventional CS grouting method.…”

Section: Advancement For Cs Transportmentioning

confidence: 99%

“…Setup of the pilot-scale model test to investigate the influence of injection rate (modified after Hamderi and Gallagher, 2015)[69].…”

mentioning

confidence: 99%

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State-of-the-Art of Colloidal Silica-Based Soil Liquefaction Mitigation: An Emerging Technique for Ground Improvement

et al. 2019

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In the booming field of nanotechnology, colloidal silica (CS) has been introduced for ground improvement and liquefaction mitigation. It possesses a great ability to restrain pore pressure generation during seismic events by using an innovative stabilization technique, with the advantages of being a cost-effective, low disturbance, and environmentally friendly method. This paper firstly introduces molecular structures and some physical properties of CS, which are of great importance in the practical application of CS. Then, evidence that can justify the feasibility of CS transport in loose sand layers is demonstrated, summarizing the crucial factors that determine the rate of CS delivery. Thereafter, four chemical and physical methods that can examine the grouting quality are summed and appraised. Silica content and chloride ion concentration are two effective indicators recommended in this paper to judge CS converge. Finally, the evidence from the elemental tests, model tests, and field tests is reviewed in order to demonstrate CS’s ability to inhibit pore water pressure and lower liquefaction risk. Based on the conclusions drawn in previous literature, this paper refines the concept of CS concentration and curing time being the two dominant factors that determine the strengthening effect. The objective of this work is to review CS treatment methodologies and emphasize the critical factors that influence both CS delivery and the ground improving effect. Besides, it also aims to provide references for optimizing the approaches of CS transport and promoting its responsible use in mitigating liquefaction.

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Section: Injection Ratementioning

confidence: 99%

Section: Advancement For Cs Transportmentioning

confidence: 99%

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State-of-the-Art of Colloidal Silica-Based Soil Liquefaction Mitigation: An Emerging Technique for Ground Improvement

et al. 2019

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“…It was also found that the colloidal silica grout reduces considerably the rates of pore pressure generation and shear strain of the silty sand specimens subjected to cyclic loading. Recent studies have been conducted by Hamderi and Gallagher (2015) where bypassive site stabilization was develop for in situ mitigation of the risk of liquefaction without surface disruption. It involves the injection of stabilizing materials into liqueable saturated sand, injecting a dilute colloidal silica stabilizer into liquefiable sand specimens.…”

Section: Innovative Solutions To Mitigate Earthquake Induced Soil Liquefaction Damages (Eild)mentioning

confidence: 99%

2nd Seminar on Transportation Geotechnics, Soil Improvement Challenges on Alluvial Zones

2019

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The aim of this abstract is to present the main design and execution criteria related with ground improvement solutions, using jet grouting columns as foundation and cofferdam solutions, at the MYRIAD SANA HOTEL , located next to the Vasco da Gama Tower, at the Tagus river right bank, in Lisbon, Portugal. The hotel , with two underwater floors and twenty two upper floors, is located at the river, over alluvial soils with a thickness of about 17m, resting over Miocene soils. This complex scenario demanded the use of some unusual ground improvement solutions, related and interconnected with foundation and cofferdam solutions. The main results of the adopted finite element models are presented, as well as of the monitoring and survey plan.

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“…The mechanism for colloidal silica transport in sand was studied [7][8]. Besides, different tests, such as full-scale explosion test [9], centrifuge tests [10][11][12] and tri-axial tests [13][14][15][16][17] were carried out to evaluate liquefaction mitigation of loose sand treated by colloidal silica.…”

Section: Introductionmentioning

confidence: 99%

Effect of Wood Fiber on the Strength of Calcareous Sand Rapidly Seeped by Colloidal Silica

et al. 2019

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Silica nano-particles are suspended in the colloidal silica and can be induced to gradually gel after the PH value changes. Thus colloidal silica can be utilized to rapidly seep through loose calcareous sand, and the silicon gel is gradually formed to bond sand particles. However, based on observation by scanning electron microscope(SEM), there are a lot of microcracks in the silica gel, which reduces the strength of the sand-gel composite. Therefore, in order to suppress crack growth, wood fibers are dispersed in the colloidal silica which still can seep through calcareous sand. 18 silicon-gel stabilized sand samples were prepared for tri-axial tests, where the concentration of colloidal silica is 20%, and wood fiber concentrations are 0%, 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, respectively. The results show that:(1) there exists an optimum ratio of wood fiber to colloidal silica, that is, as the concentration of wood fiber increases, the strength represented by the peak value of deviator stress rises first and then falls; (2) there are opposite trends between the two strength parameters, internal friction angle and cohesion, that is, when the wood fiber concentration is 0.04%, the cohesion reaches the maximum value and the internal friction angle reaches the minimum value; (3) The photos by SEM show that, there are wood fibers on the inner wall of the crack in the silica gel, which may reduce the extent of crack propagation and contribute to the strength of stabilized sand samples.

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Pilot-scale modeling of colloidal silica delivery to liquefiable sands

Cited by 34 publications

References 12 publications

State-of-the-Art of Colloidal Silica-Based Soil Liquefaction Mitigation: An Emerging Technique for Ground Improvement

State-of-the-Art of Colloidal Silica-Based Soil Liquefaction Mitigation: An Emerging Technique for Ground Improvement

2nd Seminar on Transportation Geotechnics, Soil Improvement Challenges on Alluvial Zones

Effect of Wood Fiber on the Strength of Calcareous Sand Rapidly Seeped by Colloidal Silica

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