A study on direct shear tests of frozen interface between channel bed soil and concrete lining
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Abstract:
In order to study the shear strength of the frozen interface between channel bed soil and concrete lining and its variation with the main influencing factors, a series of direct shear tests of the frozen interface between channel bed soil and concrete lining are performed. In these tests, the main influencing factors, such as soil moisture content, freezing temperature, normal stress level and freezing time, have been taken into consideration and then analyzed in detail. The experimental results show that interface existence phenomenon of local shear stress release at the initial stage of the shear tests, the release amount influenced by normal stress and soil moisture content, freezing time, but not affected by the imposed freezing temperature. Within the parameters of this test， the peak shear strength increases with the increase of soil moisture content, normal stress, freezing time, and with the decrease of freezing temperature; Essentially, the shear strength of the interface is cementation force, cohesive force and friction force between channel bed soil and concrete lining. The peak shear strength was mainly affected by cementation force due to frost. Cohesive force and friction force was mainly affected by normal stress and freezing time.
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