Investigation of scour effect on tensile capacity of suction caissons considering stress history of sand. Issue 9 (21st October 2019)

• Record Type: Journal Article
• Authors: Liu, Jinzhong; Chen, Xuguang; Zhu, Zhende; Wang, Baotian
• Is Part Of: Marine georesources & geotechnology. Volume 37:Issue 9(2019)
• Page Start: 1044
• Page End: 1056
• Publication Date: 2019-10-21
• Subjects: Suction caissons -- scour depth -- pressure -- stress history -- tensile capacity; Marine mineral resources -- Periodicals; 551.46
• DOI: 10.1080/1064119X.2018.1525455
• Languages: English
• ISSNs: 1064-119X

Abstract

Abstract: Since 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.