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Abstract

The shear strength of coarse-grained soil is difficult to be obtained by experiment in highway slag dumps. To address this issue, this paper used the parallel gradation method to configure the remade soil sample with small particle size and carried out direct shear tests of different sizes. The test results were compared with the shear strength parameters of the original coarse-grained soil, and the influence of the size effect was analyzed. The feasibility of using the parallel gradation method to predict the shear strength of coarse-grained soil was discussed. The results show that the direct shear test can predict the shear strength of the original coarse-grained soil better when the fine grain content of the soil sample using the parallel gradation method is small (0%–10%), and the sample preparation + test time is reduced to about 10% of the original time. When the fine grain content of the soil sample using the parallel gradation method is high (>10%), although the prediction effect of the internal friction angle is good, the cohesion deviates greatly from the original soil. When the above problem occurs, 4–5 groups of soil samples using the parallel gradation method are configured to conduct direct shear tests, and the Sigmoid function relationship curve between cohesion and fine grain content is established. By using the relationship curve to calculate the cohesion of the original soil, a better cohesion prediction effect can be achieved. This method can provide a reference for obtaining shear strength parameters of coarse-grained soil in the process of highway construction.

Publication Date

1-18-2024

DOI

10.14048/j.issn.1671-2579.2022.06.044

First Page

231

Last Page

235

Submission Date

May 2025

Reference

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