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Abstract

Clay sand is widely distributed in Binyang area of Guangxi, which is commonly used as subgrade filling material. Adding a certain amount of clay to soil can change the particle grading characteristics and obtain better filling effect, but it will affect the permeability characteristics of soil and thus affect the quality of subgrade filling. The inhomogeneity coefficient and curvature coefficient of sand with different clay contents were obtained by particle gradation test of sand mixed with clay. The variable head permeability test was carried out on the clay sand with different gradation indexes, and the relationship among the inhomogeneity coefficient, the curvature coefficient, and the permeability coefficient was obtained, respectively. The test results show that the permeability coefficient decreases with the increase in the inhomogeneity coefficient of clay sand. As the curvature coefficient increases gradually, the permeability coefficient increases. With the increase in the inhomogeneity coefficient, the limited particle size of the soil particles increases, and the particle size can be filled more under the same void ratio. Moreover, the pores are filled more fully, which further reduces the permeability coefficient and reduces the permeability.

Publication Date

1-18-2024

DOI

10.14048/j.issn.1671-2579.2022.06.033

First Page

179

Last Page

182

Submission Date

May 2025

Reference

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