Advanced numerical modelling of caisson foundations in sand to investigate the failure envelope in the H-M-V space

Jin, Zhuang; Yin, Zhen‐Yu; Kotronis, Panagiotis; Li, Zheng

doi:10.1016/j.oceaneng.2019.106394

Cited by 32 publications

(13 citation statements)

References 60 publications

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“…Further developments extended SPH to solid mechanics. Brief introductions to SPH method can be found in the literature (Jin Z et al, 2019a(Jin Z et al, , 2019b.…”

Section: Sph Methodsmentioning

confidence: 99%

Numerical analysis of column collapse by smoothed particle hydrodynamics with an advanced critical state-based model

Jin

Yang

2021

J. Zhejiang Univ. Sci. A

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The complex behavior of granular material considering large deformation and post-failure is of great interest in the geotechnical field. Numerical prediction of these phenomena could provide useful insights for engineering design and practice. In this paper, we propose a novel numerical approach to study soil collapse involving large deformation. The approach combines a recently developed critical state-based sand model SIMSAND for describing complex sand mechanical behaviors, and the smoothed particle hydrodynamics (SPH) method for dealing with large deformation. To show the high efficiency and accuracy of the proposed approach, a series of column collapses using discrete element method (DEM) and considering the influence of particle shapes (i.e. spherical shape (SS), tetrahedral shape (TS), and elongated shape (ES)) were adopted as benchmarks and simulated by the proposed method. The parameters of SIMSAND were calibrated from the results of DEM triaxial tests on the same samples. Compared with the results of DEM simulations and reference solutions derived by published collapse experiments, the runout distance and final height of specimens with different particle shapes simulated by SPH-SIMSAND were well characterized and incurred a lower computational cost. Comparisons showed that the novel SPH-SIMSAND approach is highly efficient and accurate for simulating collapse, and can be a useful numerical analytical tool for real scale engineering problems.

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“…Further developments extended SPH to solid mechanics. Brief introductions to SPH method can be found in the literature (Jin Z et al, 2019a(Jin Z et al, , 2019b.…”

Section: Sph Methodsmentioning

confidence: 99%

Numerical analysis of column collapse by smoothed particle hydrodynamics with an advanced critical state-based model

Jin

Yang

2021

J. Zhejiang Univ. Sci. A

Self Cite

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“…In such an elastic-perfectly plastic model, no hardening/softening law is assumed. The sand at shallow depth is under a low stress level, which normally shows dilation during shearing, with a high dilation angle possibly close to internal friction angle [39]. For simplicity, the associate flow rule implying the friction angle is equal to the dilation angle was assumed (Q p = F y ).…”

Section: Elastoplastic Behavior Of the Soilmentioning

confidence: 99%

Coupled Flow-Seepage-Elastoplastic Modeling for Competition Mechanism between Lateral Instability and Tunnel Erosion of a Submarine Pipeline

Shi

Gao

Wang

et al. 2021

JMSE

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The instability of a partially embedded pipeline under ocean currents involves complex fluid–pipe–soil interactions, which may induce two typical instability modes; i.e., the lateral instability of the pipe and the tunnel erosion of the underlying soil. In previous studies, such two instability modes were widely investigated, but separately. To reveal the competition mechanism between the lateral instability and the tunnel erosion, a coupled flow-seepage–elastoplastic modeling approach was proposed that could realize the synchronous simulation of the pipe hydrodynamics, the seepage flow, and elastoplastic behavior of the seabed soil beneath the pipe. The coupling algorithm was provided for flow-seepage–elastoplastic simulations. The proposed model was verified through experimental and numerical results. Based on the instability criteria for the lateral instability and tunnel erosion, the two instability modes and their corresponding critical flow velocities could be determined. The instability envelope for the flow–pipe–soil interaction was established eventually, and could be described by three parameters; i.e., the critical flow velocity (Ucr), the embedment-to-diameter ratio (e/D), and the non-dimensional submerged weight of the pipe (G). There existed a transition line on the envelope when switching from one instability mode to the other. If the flow velocity of ocean currents gets beyond the instability envelope, either tunnel erosion or lateral instability could be triggered. With increasing e/D or concurrently decreasing G, the lateral instability was more prone to being triggered than the tunnel erosion. The present analyses may provide a physical insight into the dual-mode competition mechanism for the current-induced instability of submarine pipelines.

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“…The classical finite element (FE) methods are mostly based on a Lagrangian formulation and are not suitable for solving geotechnical problems with large deformation due to excessive distortion of the FE-mesh. Hence, many numerical approaches have been implemented to overcome these problems, such as smoothed particle hydrodynamics (SPH), arbitrary Lagrangian-Eulerian (ALE), and CEL (Arrazola and Özel, 2010;Jin YF et al, 2018a;Yin et al, 2018;Jin Z et al, 2019). In this study, the CEL method was implemented due to a stable calculating result and a higher computational efficiency in massive grid computation (Qi et al, 2018).…”

Section: Implementation Of Cel Modellingmentioning

confidence: 99%

Numerical study on failure propagation between two closely spaced tunnels

Zheng

Zhu

Sun

et al. 2021

J. Zhejiang Univ. Sci. A

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An increasing number of engineering accidents have shown that the failure of a tunnel can propagate to a neighbouring tunnel. However, due to the complex interaction between the failed tunnel structure and the soil medium, the mechanism by which the failure is propagated between two closely spaced tunnels remains unclear. In this study, the coupled Eulerian-Lagrangian (CEL) modelling technique was adopted to investigate the influence of a failed tunnel (FT) on an adjacent tunnel, which was termed an "influenced tunnel" (IT). The safety of the IT was analysed in detail under different circumstances, such as different failure positions of the FT, different failure degrees of the FT, and different spatial relationships between the two tunnels. The simulation results indicated that the most adverse case may occur when the two tunnels are arranged as offsets and the IT is the upper tunnel. Under this circumstance, significant shear deformation may occur in IT because IT is located at the shear band of the FT.

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Advanced numerical modelling of caisson foundations in sand to investigate the failure envelope in the H-M-V space

Cited by 32 publications

References 60 publications

Numerical analysis of column collapse by smoothed particle hydrodynamics with an advanced critical state-based model

Numerical analysis of column collapse by smoothed particle hydrodynamics with an advanced critical state-based model

Coupled Flow-Seepage-Elastoplastic Modeling for Competition Mechanism between Lateral Instability and Tunnel Erosion of a Submarine Pipeline

Numerical study on failure propagation between two closely spaced tunnels

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