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Shear characteristics of frozen soil mixture

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Document pages: 8 pages

Abstract: Through the direct shear test of remolded specimens, the mechanical behavior of frozen soil mixture is studied. When the rock soil mixture is completely frozen, the peak shear strength increases significantly. The shear process experienced four stages: compaction, elastic deformation, plastic yield and failure. At the beginning of the shear test, the sample is slightly compacted in the vertical direction; Then it becomes capacity expansion. Temperature and ice content have important effects on the shear properties of frozen soil mixture. The results show that when the temperature range is 0.5 ℃, the peak shear strength of geotechnical mixture increases from − 1 ° C to − 16 ° C with the decrease of temperature, but the curve is at − 5 ° C. When the temperature is higher than this temperature, the peak value is sear strength increases sharply with temperature decreasing. Otherwise, the rise of the peak shear strength with the decrease of temperature becomes gentle. The shear strength of rock-soil mixture goes up first and then down with ice content increasing at −5°C for samples with initial water contents varying from 9 to 14 . The shear strength reaches its peak value at initial water content ranging between 10 and 12 by weight.

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