Abstract
Shear characteristics of the interface between sand and the suction caisson wall play an important role in determining the friction resistance along the suction caisson wall. In this study, a variable normal load (VNL) reflecting the effects of the penetration depth and installation rate of a suction caisson is applied using the torsional interface shear apparatus to examine the interface shear behavior. Results show that the interface friction coefficient decreases with the increase of the normal stress and shearing rate until reaching a critical value. When the friction coefficient reaches the critical value, the friction coefficient changes little with the increase of normal stress. The variation of the friction coefficient caused by the seepage flow and penetration rate should be considered for calculating the frictional force along the caisson wall. Given the same shearing rate, the normalized efficiency parameter of the interface under the VNL is higher than that obtained under the CNL. The suction calculated based on the test results of this study is in good agreement with that from the Tenby project, indicating that our findings are reliable and beneficial to analyze the installation process of the suction caisson.
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