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Physical and compaction characteristics of artificial graded granular materials after particle size distribution

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Document pages: 20 pages

Abstract: Granular materials in geotechnical engineering are generally considered to be a mixture of clay, sand and gravel commonly found in slopes, valleys or riverbed. They are especially used in the construction of earth rock dams. The complexity of granular material composition leads to the complexity of its properties. Particle size distribution (PSD) has a great influence on the strength, permeability and compaction behavior of granular materials, and there may be some implicit correlation between PSD and the compaction characteristics of granular materials. Through field test and statistical analysis, the physical and compaction characteristics of man-made graded granular materials with particle size distribution are studied. Statistical properties inPSD of dam granular materials and how the variation of PSD renders statistical constant are revealed. The statistical constants of three types of dam granular materials are 2.459, 2.475, and 2.499, respectively, on average. These statistical constants have a positive correlation with dry density and a negative correlation with moisture content. According to this characteristic and little deviation between two different calculation methods (from grading analysis and based on the Weibull distribution), the presentation of the statistical analysis ensures the validity of the Weibull function’s description of the granular materials with artificial grading. After fitting the Weibull function to the PSD curve, the relationship between the Weibull parameters and the compaction degree in different soil samples is consistent with that in different types, providing guiding significance for evaluating and selecting dam granular materials.

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