The internal friction angle is a measure of the resistance of soil to shear stress, reflecting the soil's ability to withstand deformation and maintain stability under load. This angle is crucial in understanding the strength and behavior of soils, particularly granular materials like sand and gravel, as it influences how they respond to applied forces. The internal friction angle is determined through laboratory tests, such as triaxial or direct shear tests, and is an essential parameter in geotechnical engineering design and analysis.
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