Investigation of scour effect on tensile capacity of suction caissons considering stress history of sand |
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| Authors: | Jinzhong Liu Zhende Zhu Baotian Wang |
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| Institution: | 1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, China;2. Jiangsu Research Center for Geomechanical Engineering Technology, Hohai University, Nanjing, China |
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| Abstract: | AbstractSince the pull-out response of upwind caissons governs the design of multi-caisson foundations, it is worthwhile to study scour effect on the tensile capacity of suction caissons. The tensile capacity of suction caissons after scour is relevant to the scour depth and the pressure under the caisson lid: the tensile capacity decreases dramatically with increasing scour depth; the smaller the pressure, the stronger the weakening effect of scour. Moreover, the scour effect is investigated in two cases: ignoring stress history and considering stress history. The results show that tensile capacity after scour is larger when the stress history is considered, so ignoring the stress history leads to a conservative design. In order to quantitatively evaluate the effect of scour depth and pressure, an empirical formula for the tensile capacity of suction caissons after scour is proposed based on multiple regression analysis. |
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| Keywords: | Suction caissons scour depth pressure stress history tensile capacity |
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