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Stability analysis of vertical caisson breakwater on soft intercalated ground under cyclic loading
A vertical caisson breakwater on soft intercalated ground (sand replacement in the upper layer) is highly susceptible to catastrophic failure when subjected to excessive cyclic loadings. In this paper, the cyclic stability of a caisson-rubble-ground system under different sand replacement conditions is investigated via finite element methods. Structure-soil interfaces and undrained strength degradation of the soft intercalated layer are two key considerations. The latter is implemented by modifying the Yasuhara model to quantify the strength degradation in terms of the number of cycles and stress level. Cyclic responses with different replacement ratios r (i.e., the ratio of backfilled sand layer thickness to initial total soft layer thickness) are presented in terms of pore pressure and strength degradation. Failure modes and safety factors are also investigated. Numerical results show that the pore pressure and strength degradation of the soft layer mainly occurred underneath the rubble mound, and were evident at small replacement ratios. The failure modes could be caisson sliding (r ≤ 0.35), soft ground bearing capacity failure (r > 0.50), or a combination thereof (0.35<r ≤ 0.50). The safety factor first increased and then approached a constant value with increasing replacement ratios. The findings herein provide a practical implication for safety evaluation and structural design.
Stability analysis of vertical caisson breakwater on soft intercalated ground under cyclic loading
A vertical caisson breakwater on soft intercalated ground (sand replacement in the upper layer) is highly susceptible to catastrophic failure when subjected to excessive cyclic loadings. In this paper, the cyclic stability of a caisson-rubble-ground system under different sand replacement conditions is investigated via finite element methods. Structure-soil interfaces and undrained strength degradation of the soft intercalated layer are two key considerations. The latter is implemented by modifying the Yasuhara model to quantify the strength degradation in terms of the number of cycles and stress level. Cyclic responses with different replacement ratios r (i.e., the ratio of backfilled sand layer thickness to initial total soft layer thickness) are presented in terms of pore pressure and strength degradation. Failure modes and safety factors are also investigated. Numerical results show that the pore pressure and strength degradation of the soft layer mainly occurred underneath the rubble mound, and were evident at small replacement ratios. The failure modes could be caisson sliding (r ≤ 0.35), soft ground bearing capacity failure (r > 0.50), or a combination thereof (0.35<r ≤ 0.50). The safety factor first increased and then approached a constant value with increasing replacement ratios. The findings herein provide a practical implication for safety evaluation and structural design.
Stability analysis of vertical caisson breakwater on soft intercalated ground under cyclic loading
Yan, Zhen (author) / Zhang, Baohua (author) / Liu, Ruiliang (author)
Marine Georesources & Geotechnology ; 39 ; 219-233
2021-02-01
15 pages
Article (Journal)
Electronic Resource
English
Settlements of vertical caisson breakwater
| British Library Conference Proceedings | 2004