ПРОЧНОСТНЫЕ ХАРАКТЕРИСТИКИ ИЛОВ ДЕЛЬТЫ Р. СЕВЕРНОЙ ДВИНЫ, СТАБИЛИЗИРОВАННЫХ ЦЕМЕНТНЫМ РАСТВОРОМ

Julia M. Glebova; Viktor V. Nosyrev

doi:10.25635/2313-1586.2023.02.057

Authors

Julia M. Glebova
Viktor V. Nosyrev

DOI:

https://doi.org/10.25635/2313-1586.2023.02.057

Keywords:

coastal soft clayey soils, undrained shear strength, stress strain, uniaxial compression, сement-stabilized clay, unconfined compression testing

Abstract

The article presents the study results of strength characteristics of the cement-stabilized soft clayey soils. Samples of soft clayey soils were taken from a depth of 10.6 – 10.8 meter at the site located on the island territory in the Northern Dvina delta. Thickness layers of fine and silty sands varies between 2 and 7 meter. These layers are located above the soft clayey soils of thickness up to 7 meter. The initial characteristics of the samples of soft clayey soils are: density 1.78 ; unit weight of particles 2.69 ; water content 0.50; liquid limit 0.46; plastic limit 0.36; void ratio 1.27; oedometer modulus 1.5 МPа. The specific feature of the soft clayey soils is the organic content of up to 11%. The aim of the research was to find the dependencies of the undrained shear strength с_u and cement content m. The undrained shear strength was determined by the method of uniaxial compression of cylindrical samples without a cage according to GOST 12248.2-2020.

Cement used for stabilization of the soft clayey soils: grade of cement is CEM 42.5 N, beginning of setting is 135 minutes, compression strength at an exposure of 2 days is 30.9 МPа, compression strength at an exposure of 28 days is 57.9 МPа. The samples сement-stabilized clay at an exposure of 28 days were loaded with a vertical stress in LoadTrac-II GeoComp loading frames until destruction. The cement fiber contents were 5, 10, 15, 20 % by weight of the dry soil.

The results indicate that the shear strength for the investigated cement-stabilized soft clayey can increase several times. For example, undrained shear strength of natural soils was 17 kPa, while undrained shear strength of natural soils mixed with 5% cement is 85 kPa, and exceeded the value of 75 kPa as a characteristic of weak soils. The linear correlation of the undrained shear strength с_u with a cement content m was obtained: с_u = 4,0m + 67.9 (R² = 0.94). Samples of сement-stabilized clay were characterized by brittle destruction when reaching the ultimate resistance.

The equation can be used for geological survey and design of buildings foundations, harbors, and bank protection walls, as well as using methods of numerical simulation.

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