Abstract
The improved granular mixtures are widely used as the fillings of railway subgrade, and in order to investigate the effect of coarse grain content on granular mixtures, a series of field tests were conducted. The experimental results indicate that the permeability coefficient increases significantly with the increment of granite gravel content, especially in the range of 60%–70%. There exists a coarse grain content limit defined as 53%–58.5% to reform the permeable granular skeleton. Beyond this limit, the permeable granular skeleton is efficiently formed, and the macro pores between the separate gravels are partially filled, which is the explanation for the permeability increase. The investigations indicate the subgrade resistance modulus (k 30, E v2, and E vd) depends on the granite gravel content, and the resistance modulus increases significantly beyond granite gravel content of 50%. The skeletons of granite gravel-clayey sand mixture change in the long-term deformation objected to the train-induced dynamic load, which involves three main repeated and circular deformation stages. Generally, the long-time deformation is explained as the gravel crushing and filling the internal porous space with crushed gravel fragments. Through these investigations, the C40–G60 or C30–G70 is recommended as an optimum soil mixture for the good permeability and high resistance modulus.
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LI D, SELIG E T. Cumulative plastic deformation for fine-grained subgrade soils [J]. J Geotech Eng, 1996, 122(12): 1006–1013.
CHAI J C, MIURA N. Traffic-load-induced permanent deformation of road on soft subsoil [J]. J Geotech Geoenviron Eng, 2002, 128(11): 907–916.
WERKMEISTER S. Permanent deformation behavior of unbound granular materials in pavement constructions [D]. Germany: Technical University Dresden, 2003.
FRETTI C, LO PRESTI D C F, PEDRONI S. A pluvial deposition method to reconstitute well-graded sand specimens [J]. Geotech Testing J, 1995, 18(2): 292–298.
FEDA J. Mechanics of particulate materials [M]. Amsterdam: The Principle Elsevier, 1982: 70–78.
HYSLIP J P. Fractal analysis of the roughness and size distribution of granular materials [J]. J Engineering Geology, 1997, 48(6): 231–244.
FEDA J. Catacalsic compression of soils [J]. J Acta Technnol, 1999, 44(2): 255–237.
VALLEJO L E, MAWBY R. Porosity influence on the shear strength of granular material-clay mixtures [J]. Engineering Geology, 2000, 58(1): 125–136.
CHEN Xiao-bin, ZHANG Jia-sheng. Grain crushing analysis and effects on the weathered granular soil’s rheological behavior [J]. Journal of Central South University, 2012, 19(7): 2022–2028.
SHAKOOR A, COOK B D. The effect of stone content, size, and shape on the engineering properties of a compacted silty clay [J]. Eng Geologists, 1990, 117(2): 245–253.
PROCTOR R R. Fundamental principles of soil compaction [R]. Engineering News-Record, ASCE. 1993.
DUNN A, MEHUYS G. Relationship between gravel content of soils and saturated hydraulic conductivity in laboratory tests [J]. Soil Science Society of American Journal, 1984, 48(3): 736–740.
SHELLEY T L, DANIEL D E. Effect of gravel on hydraulic conductivity of compacted soil liners [J]. Journal of Geotechnical Engineering, ASCE, 1993, 119(1): 54–68.
INDRAWAN I G B, RAHARDJO H, LEONG E C. Effects of coarse-grained materials on properties of residual soil [J]. Journal of Engineering Geology, 2006, 82(3): 154–164.
SHAFIEE A. Permeability of compacted granule-clay mixtures [J]. Engineering Geology, 2008, 97(7): 199–208.
ASTM D 2434. Standard Test Method for Permeability of Granular Soils (Constant Head) [S]. USA: ASTM International Press, 1997.
ASTM D2434-68. Standard Test Method for Permeability of Granular Soils (Revised, Constant Head) [S]. USA: ASTM International Press, 2006.
JAFARI M K, SHAFIEE A. Mechanical behavior of compacted composite clays [J]. Canadian Geotechnical Journal, 2004, 41(6): 1152–1167.
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Foundation item: Project(51378514) supported by the National Natural Science Foundation of China
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Chen, Xb., Li, Zy. & Zhang, Js. Effect of granite gravel content on improved granular mixtures as railway subgrade fillings. J. Cent. South Univ. 21, 3361–3369 (2014). https://doi.org/10.1007/s11771-014-2310-z
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DOI: https://doi.org/10.1007/s11771-014-2310-z