Rock and Soil Mechanics ›› 2020, Vol. 41 ›› Issue (3): 831-836.doi: 10.16285/j.rsm.2019.0565

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Single-parameter gradation equation for coarse-grained soil and its applicability

WU Er-lu1, 2, ZHU Jun-gao1, 2, WANG Long1, 2, CHEN Ge1, 2   

  1. 1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 2. Jiangsu Research Center for Geotechnical Engineering Technology, Hohai University, Nanjing, Jiangsu 210098, China
  • Received:2019-03-24 Revised:2019-07-31 Online:2020-03-11 Published:2020-05-25
  • Supported by:
    This work was supported by the National Key R&D Program of China (2018YFC1508505), the Fundamental Research Funds for the Central Universities (2018B668X14), the Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX18_0566), Yalong River Joint Fund of Natural Science Foundation of China - Yalong River Basin Hydropower Development Co., Ltd., (U1865104), the National Natural Science Foundation(51479052) and the 111 Project(B13024).

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Abstract: A gradation equation with one parameter is derived to describe continuous gradation of coarse-grained soil. The basic properties of the gradation equation are studied, and the ability of the gradation equation to reflect two typical gradation curves of continuous gradation is analyzed. The applicability of the gradation equation is verified by several gradation curves of coarse-grained soil used in earth-rock dam engineering, and the range of ? deduced for the gradation is well represented. The study shows that the gradation equation can reflect the two typical hyperbolic and sigmoidal, gradation curves. The range of gradation parameter is 0–1. the curve gradation equation expresses is hyperbolic for small value of the parameter, and is sigmoidal for large value of the parameter. The gradation equation widely applies for gradations of different coarse-grained soils used in earth-rock dam, and it is more practical than fractal gradation equation and continuous gradation equation. The equation parameter greater than 0.13 implies well representation of the gradation, which provides a basis for the gradation design of coarse-grained soil for earth-rock dam.

Key words: gradation curves, gradation equation, coarse-grained soil, applicability, one parameter

CLC Number: 

  • TU411
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