ORIGINAL RESEARCH
Study on The Influence of Grain Size Composition
on Engineering Properties of Granite Residual Soil
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1
School of Architectural Engineering, Guangzhou Institute of Science and Technology, Guangzhou 510540, China
2
School of Earth Sciences and Engineering, Sun Yat-sen University, Zhuhai 519082, China
3
Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China
4
Guangdong Provincial Key Laboratory of Mineral Resources and Geological Processes, Guangzhou 510275, China
Submission date: 2023-04-04
Final revision date: 2023-05-04
Acceptance date: 2023-05-29
Online publication date: 2023-07-24
Publication date: 2023-08-11
Pol. J. Environ. Stud. 2023;32(5):4291-4300
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ABSTRACT
The parent rock properties, weathering degree and soil formation conditions of soil in different
regions and different levels are different, which results in the obvious difference of grain size
composition of soil. At present, the research on granite residual soil often ignores the mechanism of its
grain size composition on engineering properties. In this study, a series of soil samples with different
grain size composition were configured based on the content of gravel grain in the granite residual soil.
This paper mainly studies the influence of the content of gravel grain group and fine grain group of the
compaction and strength of granite residual soil. The results show that the optimal moisture content and
cohesion of granite residual soil are mainly controlled by the content of fine grain, and the maximum
dry density and internal friction angle are mainly controlled by gravel grain. For each 1% increase in
the fine grain content of the soil, the optimal moisture content of the soil will approximately increase
by 0.11%, and correspondingly, the cohesion of the soil will approximately increase by 0.27 kPa.
In addition, the engineering properties of granite residual soil with different grain size composition
are also affected by soil structure. Finally, based on the microstructure characteristics of granite
residual soil, three different aggregates are proposed, and seven micro models with different structural
characteristics are established. Micro models established by different aggregates can control different
engineering properties of soil. The research results are helpful to understand the relationship between
the engineering properties and grain size composition of granite residual soil and provide reference for
the refinement of its engineering classification.