Simulation of Suction Caisson Penetration in Seabed Using an Adaptive Mesh Technique

Zeinoddini, M.; Mousavi, Seyed Amin; Abdi, Mahmood Reza

doi:10.1016/j.proeng.2011.07.216

Cited by 5 publications

(1 citation statement)

References 2 publications

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“…Vasquez and Tassoulas (2000) proposed a finite element model with remeshing technique to analyze the process of caisson penetrating into clay. Zeinoddini et al (2011) carried out a similar simulation by implanting Drucker-Prager model in to the calculation for characterizing the soil behavior. Some simulations also investigated the influence of uplift force on skirted foundations and suction caissons and the time-displacement response in the uplift process (Erbrich and Tjelta 1999;Houlsby and Byrne 2005;Gourvenec and Randolph 2009;Gourvenec and Randolph 2010).…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling and verification of grouting with mold bag treatment on seepage failure in foundation excavation

Zhou

Liu

et al. 2018

Geomatics, Natural Hazards and Risk

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This article presents a numerical modeling and verification on a new grouting technique, called mold bag prestress reinforcing method, which was successfully used for grouting control on seepage failure during a foundation pit excavation project. A numerical model is established based on finite element method to simulate the prestrss reinforcing and grouting process. The displacement and stress field during grouting process are calculated. Based on the calculation results, the rationale of the pretress method is clearly illustrated and the reinforcing mechanism is revealed. Results show that the horizontal displacements on the monitoring lines parallel to the mold bag are distributed in a parabola shape, and the prestress method effectively improves the mechanical properties of the soil. The influence of multimold bag interaction is also analyzed. The impermeability of the interior areas between two mold bags can be further improved due to a combining effect. The numerical results are compared with the actual excavation results of the foundation project. After grouting treatment, the water inflow amount reduced from 94 m 3 /h to 4 m 3 /h, which means more than 96% water inflow was successfully reduced. It is concluded that the numerical model can successfully simulate the process of prestress method and reveal the reinforcing mechanism.

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Section: Introductionmentioning

confidence: 99%

Numerical modeling and verification of grouting with mold bag treatment on seepage failure in foundation excavation

Zhou

Liu

et al. 2018

Geomatics, Natural Hazards and Risk

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show abstract

Installation of caisson in non-uniform clay interbedded with a sand layer

Zhou

Zhang

et al. 2021

Computers and Geotechnics

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Soil conditions and bounds to suction during the installation of caisson foundations in sand

2014

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Suction installation of caisson foundations is widely adopted in the oil offshore industry. ٢ When such foundations are installed in sand, seepage conditions are known to play a pivotal ٣ role in the installation process. Pressure gradients generated by the imposed suction inside the ٤ caisson cavity cause an overall reduction in the lateral soil pressure acting on the caisson wall ٥ as well as in the tip resistance. This transient loosening of soil around the caisson wall ٦ facilitates caisson penetration into the seabed. However, these effects must be controlled to ٧ avoid soil failure due to critical conditions such as piping or loss of soil shear strength, which ٨ may cause the installation procedure to fail due to instability of the soil plug trapped inside ٩ the caisson cavity. In this paper, we endeavour to study these effects based on the analysis of ١٠ the normalised seepage problem, assuming the installation process to take place in ١١ homogeneous sand. We first investigate the effects of seepage conditions on soil resistance to ١٢ caisson penetration with a particular focus on how frictional resistance and tip resistance are ١٣ differently affected. We then consider modes of failure due to soil piping inside the caisson ١٤ cavity and sliding of soil mass in a failure mechanism where the soil plug inside the caisson ١٥ cavity is pushed upward. Based on this study, some insight is gained into the critical ١٦ conditions for piping. These conditions evolve during the installation process as the ١٧ penetration depth increases under an increasing suction. Upper and lower bounds are also ١٨ estimated for the critical suction based on an assumed mode of failure using a simple ١٩ mechanism of rigid blocks. By comparing these modes of failure we conclude that piping is ٢٠ not always the most critical condition. The critical mode of failure for a given soil may ٢١ change during the installation process and this is highlighted by comparing the critical ٢٢ suction for piping to the suction upper and lower bounds related to shear failure.

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Simulation of Suction Caisson Penetration in Seabed Using an Adaptive Mesh Technique

Cited by 5 publications

References 2 publications

Numerical modeling and verification of grouting with mold bag treatment on seepage failure in foundation excavation

Numerical modeling and verification of grouting with mold bag treatment on seepage failure in foundation excavation

Installation of caisson in non-uniform clay interbedded with a sand layer

Soil conditions and bounds to suction during the installation of caisson foundations in sand

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