Large Scale Direct Shear Box Tests on Gravels

The determination of shear strength characteristics of gravelly soils is difficult through the use of conventional small scale, triaxial or simple shear testing devices in the laboratory due to membrane compliance and boundary effects; or due to inconsistent penetration resistances measured as part of standard or cone penetration testing in the field. These limitations require the use of available empirical or semi-empirical relationships or the execution of large scale laboratory or field tests. In the literature there exists inconsistent, and large range of recommendations for shear strength parameters. Within the confines of this study, direct shear box test results performed on poorly- (GP) and well-graded (GW) gravel samples with initial void ratio ranging from 0.42 to 0.53 are presented, which are tested under effective normal stresses ranging from 77 to 205 kPa. The estimated peak secant-angles of shearing resistances vary in the range of 49 to 54 degrees. On the basis of volumetric change vs. shear strain responses, the peak angle of dilation and elastic Poisson’s ratio are estimated to vary in the range of 10-16 degrees and 0.28-0.39, respectively. These estimated values are compared with available literature.

Anahtar Kelimeler:

Murat River gravel, direct shear box test, angle of shearing resistance, dilation angle, void ratio

Large Scale Direct Shear Box Tests on Gravels

Keywords:

Murat River gravel, direct shear box test, angle of shearing resistance, dilation 28 angle, void ratio,

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Asadzadeh, M., Soroush, A., Direct Shear Testing on a Rockfill Material. Arabian Journal for Science and Engineering, Vol. 34, No. 2B, 379-396, 2009.
ASTM D3080 / D3080M – 11: Standard Test Method for Direct Shear Test of Soils Under Consolidated Drained Conditions
ASTM D854: Standard Test Methods for Specific Gravity of Soil Solids by Water Pycnometer
ASTM D6913 / D6913M-17, Standard Test Methods for Particle-Size Distribution (Gradation) of Soils Using Sieve Analysis, ASTM International, West Conshohocken, PA, 2017, www.astm.org
Bolton, M. D., The strength and dilatancy of sands. Geotechnique, Vol. 36, No. 1, 65-78, 1986.
Frossard, E., Hu, W., Dano, C., Hicher, P. Y., Rockfill shear strength evaluation: a rational method based on size effects. Géotechnique, Thomas Telford, 62 (5), pp.415-427, 2012.
Li, X. Z, Li, J. L., Deng, H. F., In-Situ Direct Shear Test Research of Rock and Soil of Typical Bank Slope in Three Gorges Reservoir Area. Electronic Journal of Geotechnical Engineering, Vol. 19, Bundle K, 2523-2534, 2014.
Liu, S. H., Application of in situ direct shear device to shear strength measurement of rockfill materials. Water Science and Engineering, 2 (3): 48-57, 2009.
Liu, S. H., Xiao, G. Y., Yang, J. Z., and Wu, G. Y, New in-situ direct shear tests on rockfill materials at Yixing Pumped Storage Power Station Project. Chinese Journal of Geotechnical Engineering, 26(6), 772-776, 2004, (in Chinese).
Matsuoka, H., Liu, S. H., Sun, D., and Nishikata, U., Development of a new in-situ direct shear test. Geotechnical Testing Journal, 24(1), 92-102, 2001. [doi:10.1520/GTJ11285J]
NAVFAC, Soil Mechanics Design Manual 7.01. Naval Facilities Engineering Command, 1986.
Powers, M.C., A new roundness scale for sedimentary particles. Journal of Sedimentary Petrology, 23:117-119, 1953.
Simoni, A., Houlsby, G.T., The Direct Shear Strength and Dilatancy of Sand-gravel Mixtures. Geological and Geotechnical Engineering, Vol. 24, pp. 523-549, 2006.
Vasistha, Y., Gupta, A. K., Kanwar, V., Prediction of Shear Strength Parameters of Two Rockfill Materials. Electronic Journal of Geotechnical Engineering, Vol. 17, Bundle W, 3221 – 3232, 2012.
Vermeer, P. A., de Borst, R., Non-associated plasticity for soils, concrete and rock. Heron, Delft University of Technology, Vol. 29, No.3 , 1984.
Wadell, H., Volume, shape and roundness of rock particles. Journal of Geology, 40:443-451, 1932.
Wang, J. J., Yang, Y., Chai, H.J., Strength of a Roller Compacted Rockfill Sandstone from In-Situ Direct Shear Test. Soil Mechanics and Foundation Engineering, Vol. 53, No.1, March 2016.
Xiao, Y., Liu, H., Chen, Y., Jiang, J., Strength and Deformation of Rockfill Material Based on Large-Scale Triaxial Compression Tests. I: Influences of Density and Pressure. ASCE Journal of Geotechnical and Geoenvironmental Engineering, Vol. 140, No:12, December 2014.
Xiao, Y., Liu, H., Zhang, W., Liu, H., Yin, F., Wang, Y., Testing and modeling of rockfill materials: A review. Journal of Rock Mechanics and Geotechnical Engineering, Vol. 8., 415-422, 2016.