Pavement Engineering, 22-23 February 2006 (14 p), Liverpool John Moores University, Liverpool 2006.
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Leyla Bouaricha, Ahmed Djafar Henni and Laurent Lancelot
.A., P apaliangas T.T., K onstantinidis D., P atronis C., Shear strength of sands reinforced with polypropylene fibers , Geotechnical and Geological Engineering, 2013, 31(2), 401–442.
 A rab A., S hahrour I., L ancelot L., A laboratory study of liquefaction of partially saturated sand , J. Iber. Geol., 2011, 37(1), 29–36.
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 B elkhatir M., A rab A., D ella N
Djamel Bouri, Abdallah Krim, Abdelkader Brahim and Ahmed Arab
tested materials: (a) Sand and silt, (b) Sand-silt mixtures.
Materials used in this study: (a) fines content, (b) clean sand, (c) samples prepared by dry deposition sand-silt mixtures.
Samples prepared by wet deposition: (a) clean sand, (b) sand-silt mixtures.
2.2 Experimental Procedures
In order to study the influence of the fines content and the sample preparation method on shear strength, a total of 120 directsheartests were carried out at three normal stresses 100, 200 and 400 kPa. Sixty (60) tests are performed in
Kheira Boutouba, Ismail Benessalah, Ahmed Arab and Ahmed Djafar Henni
the material for use in wet method is capital for its homogeneity and the continuity of the works, and thereby performing a parametric study on the cemented soil material. A series of directsheartests were carried out on a sandy soil reinforced by a hydraulic binder (cement). The use of the direct shear apparatus enabled us to study the characteristics of the shear strength and the variation of vertical deformation of cemented sand. The parameters used in this study are mainly: the relative density ( Dr = 80%), the normal stress ( σn = 100, 200 and 400 kPa), the
The dredger fill of Shanghai Hengsha Island Dongtan is solidified by curing agents with different fly ash content, and the shear strength index of solidified dredger fill is measured by the direct shear test. The microscopic images of solidified dredger fill are obtained by using SEM. The microscopic images are processed and analyzed by using IPP, and the fractal dimension including particle size fractal dimension Dps, aperture fractal dimension Dbs and particle surface fractal dimension Dpr is calculated by fractal theory. The quantitative analysis of the relationship between shear strength index and fractal dimension of solidified dredger fill is done. The research results show that the internal friction angle and the cohesion are closely related to the fly ash content λ and the curing period T, and the addition of fly ash can improve the effect of curing agent; There is no obvious linear relationship between the internal friction angle and the three fractal dimensions; The smaller particle surface fractal dimension Dpr and particle size fractal dimension Dps, the larger aperture fractal dimension Dbs, the greater the cohesion, and the cohesion has a good linear relationship with three fractal dimensions, and the correlation coefficient R2 is above 0.91.
ballast subjected to directsheartesting. International Journal of Geomechanics. 2014, Vol. 1, pp. 34-44.
 JIANG, M. J., H.-S. YU & D. HARRIS. A novel discrete model for granular material incorporating rolling resistance. Computers and Geotechnics. 2005, Vol. 32, pp. 340-357.
 JIANG, M. J., Z. SHEN & J. WANG. A novel three-dimensional contact model for granulates incorporating rolling and twisting resistances. Computers and Geotechnics. 2015, Vol. 65, pp. 147-163.
 LIM, W. L. & G. R. McDOWELL. Discrete element
and landslide hazard maps in Skawina - rural area, sheet M-34-76-B-a-4.
 PN-EN 1997-2:2009:Eurokod 7. Geotechnical design - Part 2: Ground investigation and testing (in Polish).
 PKN-CEN ISO/TS 17892-10:2009 Geotechnical investigation and testing - Laboratory testing of soil - Part 10: Directsheartests (in Polish).
Czesław Dymarski, Paweł Dymarski and Aleksander Kniat
Brothers, UK, 1986.
5. Iwicki P., Tejchman A., Chróścielewski J., DYNAMIC FE SIMULATIONS OF BUCKLING PROCESS IN THINWALLED CYLINDRICAL METAL SILOS, Thin-walled structures. Vol. 84 (2014), pp.344-359.
6. Kozicki J., Niedostatkiewicz M., Tejchman A., Muhlhaus H., DISCRETE MODELLING RESULTS OF A DIRECTSHEARTEST FOR GRANULAR MATERIALS VERSUS FE RESULTS. Granular Matter, Vol. 15, iss. 5 (2013), pp.607-627.
7. Veic D., Kraskowski M., Bugalski T., BOTTOM FIXED SUBSTRUCTURE ANALYSIS, MODEL TESTING AND DESIGN FOR HARSH ENVIRONMENT