Abstract This paper presents findings from an experimental study examining the effects of colloidal nanosilica grouting on the behavior of collapsible soil under monotonic and cyclic loading conditions. Drained and undrained monotonic as well as cyclic triaxial tests were conducted on cemented and non-cemented soil specimens. Results indicated that the injection of colloidal nanosilica enhanced shear strength, reduced excess pore water pressure, and increased the brittleness index of cemented samples. In cyclic triaxial tests, non-cemented soil samples experienced liquefaction within initial cycles, while cemented samples remained stable until the 300th cycle. An elastoplastic constitutive model was employed to describe the mechanical behaviors of cemented and non-cemented soil specimens, showing good agreement between calculated and experimental results. However, slight discrepancies were observed in the trends of pore pressure and volume change for cemented soil. Factors such as incomplete saturation during sample preparation, hydraulic gradients along the length of the sample, colloidal nanosilica compressibility, and instrument sensitivity during data collection can lead to discrepancies between experimental and calculated values.
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Meftahi et al. (2024) studied this question.
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