A laboratory and in-situ investigation of silica colloid injection on reducing liquefaction potential in young coastal sediments in the south of the Caspian Sea

Document Type : Research Paper


Department of Civil Engineering, Qazvin Branch, Islamic Azad University, Qazvin, Iran


In this study, soil samples with different weight percentages of silica colloids were subjected to uniaxial compression strength (UCS) tests in a parking lot in Anzali port (northern Iran) to estimate the suitable amount of these colloids to prevent soil liquefaction (10 wt.%). Next, by performing triaxial cyclic tests, the behavior of native sand and the one stabilized with optimal silica colloidal content (10 wt.%) was studied to ensure the occurrence of liquefaction with this content. Afterward, the soil of the study site was improved through a straightforward method, which includes driving screened pipes and injecting silica nanocolloids into the soil by these pipes with appropriate injection pressure. Key parameters in this method include accurate determination of injection pressure, gelation time, grain-size distribution of soil, and proper distribution of silica colloids at the site. In the next step, the effectiveness of the proposed improvement method was assessed by performing standard penetration tests and measuring the hydraulic conductivity. Overall, the results revealed that the proposed improvement method significantly enhanced the standard penetration number, and the formation of colloidal silica gel lowered the hydraulic conductivity of the study site. For instance, the average permeability in the first layer of unstabilized soil was 2.1 × 10-2 cm/s, which reaches 1.6 × 10-8 cm/s by performing the grouting operation. Finally, the relationship quF = 0.68 × quL was obtained between laboratory and field UCS values of the study site by sampling the soil stabilized in situ and performing UCS tests on them.


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Article Title [Persian]


ASTM D2166/D2166M-16, 2016. Standard test method for Unconfined Compressive Strength of Cohesive soil, ASTM International, West Conshohocken, PA.##
ASTM D-4253, 2016a. Standard Test Methods for Maximum Index Density and Unit Weight of Soils Using a Vibratory Table, In Annual Book of ASTM Standards, Philadelphia, PA.##
ASTM D-4254, 2016b. Standard Test Methods for Minimum Index Density and Unit Weight of Soils and Calculation of Relative Density. In Annual Book of ASTM Standards, Philadelphia, PA.##
ASTM D5311-92, 2004. Standard test method for load controlled cyclic triaxial strength of soil, West Conshohocken, PA.##
ASTM, 2015. Standard test method for field measurement of hydraulic conductivity using borehole infiltration, Annual Book of ASTM Standards, Designation D 6391-11, Vol. 4.08, ASTM, West Conshohocken, PA.##
Clark, G.C., Davies, R.G., Hamzepour, B., Jones, C.R., 1975. Explanatory text of the Bandar-e-Anzali quadrangle map 1:250000, Geological survey of Iran, Tehran. Geopersia 2022, 12(2): 223-239 239##
Conlee, C.T., 2010. Dynamic Properties of Colloidal Silica Soils Using Centrifuge Model Tests and a Full-Scale Field Test, Ph.D. Thesis, Drexel University, Philadelphia, PA, USA.##
Cubrinovski, M., Ishihara, K., 1999. Epirical correlation between SPT N-value and relative density for sandy soil, Journal of Soils and Foundations, 39 (5): 61-71.##
Díaz-Rodríguez, J.A., Antonio-Izarraras, V.M., Bandini, P., López-Molina, J.A., 2008. Cyclic strength of a natural liquefiable sand stabilized with colloidal silica grout. Canadian Geotechnical Journal, 45: 1345-1355.##
Gallagher, P.M., C.T. Conlee, K.M. Rollins, 2007. Full-scale field testing of colloidal silica grouting for mitigation of liquefaction risk, Journal of Geotechnical and Geoenvironmental Engineering, 133 (2): 186-196.##
Gallagher, P.M., Lin, Y., 2005. Column testing to determine colloidal silica transport mechanisms, Innovations in grouting and soil improvement, ASCE, Reston, Va., 15-26.##
Gallagher, P.M., Mitchell, J.K., 2002. Influence of colloidal silica grout on liquefaction potential and cyclic undrained behavior of loose sand, Soil Dynamic and Earthquake Engineering, 22: 1017-1026.##
Guest, B., Guest, A., Axen, G., 2007. Late Tertiary tectonic evolution of northern Iran: a case for simple crustal folding, Global Planet Chang, 58: 435-453.##
Ikeno, K., Mitou, M., Nakazawa, H., and Sugano, T., 2011. Countermeasure for liquefaction to runway ground by application of chemical grouting method, Proceedings of International Symposium on Deformation Characteristics of Geomaterials, IOS Press, Amsterdam, the Netherlands.##
Iler, R.K., 1979. The Chemistry of Silica: Solubility, Polymerization Colloid and Surface Properties, and Biochemist Try, Wiley, New York.##
Kawamura, K., Yamazaki, H., Sugano, T., Hayashi, K., 2004. Proof experiment using artificial earthquake concerning effect of permeable grouting method as measures against liquefaction, Proceedings 13th World Conference on Earthquake Engineering, Canadian Association for Earthquake Engineering, and International Association for Earthquake Engineering.##
Kroonenberg, S.B., Badyukova, E.N., Storms, J.E.A., Ignatov, E.I., Kasimove, N.S., 2000. A full sealevel cycle in 65 years: barrier dynamics along Caspian shore, Sediment Geology, 134: 257-274.##
Lahijani, H.A.K., Rahimpour-Bonab, H., Tavakoli, V., Hosseindoost, M., 2009. Evidence for late Holocene highstands in Central Guilan–East Mazanderan, South Caspian coast, Iran, Quaternary International, 197: 55-71.##
Nogol-e-Sadat, M.A.A., 1991. Comprehensive geological studies of Guilan Province, Governmental Office of Guilan Province, Rasht.##
Noll, M.R., C.L. Bartlett, T.M. Dochat, 1992. In situ permeability reduction and chemical fixation using colloidal silica, In Proceedings 6th National Outdoor Action Conference, 443–457. Westerville, OH: Water Well Journal Publishing Company.##
Persoff, P., Apps, J., Moridis, G., Whang, J.M., 1999. Effect of dilution and contaminants on sand grouted with colloidal silica, Journal of Geotechnical and Geoenvironmental Engineering, 125:6,461-469.##
Rasouli, R., Hayashi, K., Zen, K., 2016. Controlled permeation grouting method for mitigation of liquefaction, Journal of Geotechnical and Geoenvironmental Engineering, 142: 04016052.##
Seed, H.B., 1982. Ground Motions and Soil Liquefaction during Earthquakes, Earthquake Engineering Research Insititue, Oakland, CA, USA.##
Suazo, G., Fourie, A., Doherty, J., 2016. Cyclic Shear Response of Cemented Paste Backfill, Journal of geotechnical and geoenvironmental engineering, 143(1): 04016082.##