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ANALYSIS OF SHEAR STRENGTH PROPERTIES OF COARSE - GRAINED SOILS IMPROVED BY THE CEMENT
Abstract
The article deals with determination of shear strength properties of improved coarse - grained soils using a large-dimensional direct shear test apparatus. A road embankment in front of a new bridge over the Danube River in the Komarno city will be made of the gravel improved by the cement. Aim of the analysis is determination of the shear strength properties of this improved material for optimal and reliable design of the road embankment. The shear strength of gravel was determined in the SHEARMATIC 27-WF2304 shear test apparatus. The box for sample has a dimension of 300 x 300 mm and a height of 200 mm. The first series of tests were executed on the original sample of soil. The gravel was classified as the gravel well graded. The second ones were executed on the samples of gravels which were improvement by the cement. The added cement formed 2% of the sample volume. The results confirmed improvement of the shear strength of gravel. The peak angle of shear strength was increased for about 15 %. The results also showed that there is no impact of improvement for residual shear strength and the value of angle of shear strength is the same for all samples.
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References5
Saroglou I. H. Compressive Strength of Soil Improved with Cement. International Foundation Congress and Equipment Expo 2009. Orlando, Florida, USA, March 15 -19, 2009, pp. 289 – 296;
Horpibulsuk, S. & Rachan, R. & Katkan, W. & Nagaraj, T. S. Strength Development in Cemented Stabilized Coarse Grained Soils. Ground Modification and Seismic Mitigation, Shanghai, China, June 6 – 8, 2006, pp. 51 – 56;
Hulla, J. & Turček, P. Foundation engineering. Jaga, Bratislava, Slovakia, 1998, 310 p. (in Slovak);
Matsumaru, T. & Watanabe, K. & Isono, J. & Tateyama, M. & Uchimura, T. Application of Cement – Mixed Gravel Reinforced by Geogrid for Soft Ground Improvement. Proceedings of the 4th Asian Regional Conference on Geosynthetics, Shanghai, China, June 17 – 20, 2008, pp. 380 – 385;
Sulovska, M., Stacho, J.: Large dimensional direct shear tests of coarse – grained soils. Current geotechnical solutions and their verification, Proceedings of the 13th Slovak Geotechnical Conference. Bratislava, Slovakia, 2017, pp. 310 – 317 (In Slovak).
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