Upper bound solutions of vertical bearing capacity of skirted mudmat in sand

Chen, Guangsi

doi:10.1016/j.apor.2018.01.017

Cited by 11 publications

(3 citation statements)

References 17 publications

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“…On the other hand, an alternative method to improve the footing capacity is investigated by using skirts along each side of a foundation to provide a lateral confinement. Several researchers have highlighted the beneficial effect of these skirts by numerical and physical modeling (Bansby and Randolph [6], Yun and Bransby [35], Andersen et al [3], Eid [11], Chen and Liu [7], Selmi et al [31], Zeydi and Boushehrian [36], Al-Aghbari and Mohamedzein [1], Jiang et al [19], Santhoshkumara and Ghosh [29], Barari et al [4]). Saleh et al [28] studied the behavior of skirted strip footing subjected to eccentricinclined load considering various factor such as load inclination angles, skirt lengths and load eccentricities.…”

Section: Introductionmentioning

confidence: 99%

Behavior of Vertically Confined Square Footing on Reinforced Sand under Centric Inclined Loading

Kirtimayee

Samadhiya

2022

Studia Geotechnica Et Mechanica

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This study presents the behavior of vertically confined square footing on geogrid-reinforced sand under centric inclined loading through a series of experimental tests. The load was applied at 5°, 10° and 20° angles of inclination with the vertical. The tests were conducted on surface footing, footing with confiner and footing with confiner and horizontal reinforcement configurations subjected to inclined loading. Parametric variations like depth of the confiner (d=1B, 1.5B, 2B), number of geogrid layers (N; varies with variation in depth of confiner), and spacing between horizontal reinforcements (Y=0.25B, 0.5B, 0.75B, 1B) have been investigated at the top surface dimension of confiner (D) as 1.0B, 1.5B and 2.0B (where B is the width of the model footing). Results show that combined effect of confiner and horizontal reinforcement increases the ultimate bearing capacity of footing significantly compared to only confiner for all angle of inclinations. It can also be observed that load bearing capacities decrease with increase in angles of inclination and record the minimum improvement at 20° angle of inclination. Improvement in bearing capacities and reduction in settlement of footing analyzed in terms of bearing capacity ratio (BCR) and settlement reduction factor (SRF) are compared for all footing configurations. To summarize, the test results showed that confiner along with reinforcement can be considered as an economic ground improvement technique for shallow foundations to counter against heavily inclined loading.

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Section: Introductionmentioning

confidence: 99%

Behavior of Vertically Confined Square Footing on Reinforced Sand under Centric Inclined Loading

Kirtimayee

Samadhiya

2022

Studia Geotechnica Et Mechanica

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“…In order to reveal the effects of the tsunami wave on the marine structures, the proposed real-world tsunamilike wave is employed to investigate the tsunami waves impacting on Submarine Pipeline End Manifold (PLEM). Under the tsunami waves, the hydrodynamic loads of PLEM might exceed the design limit instantaneously, leading to irreversible strength damage or loss of overall balance of structures [10] Therefore, to study on hydrodynamic characteristics of PLEMs under tsunami waves is gradually attracted to by researchers. Wang et al [11] proposed a mathematical model for the optimal layout of cluster manifolds with PLEMs under extreme marine conditions.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Hydrodynamics Around Submarine Pipeline End Manifold (PLEM) Under Tsunami-Like Wave

et al. 2019

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Submarine Pipeline End Manifold (PLEM) is the converge end or termination of submarine pipelines, which is used to provide additional support for equipment in the submarine production system on the seafloor. However, PLEM is vulnerable to extreme waves (i.e., tsunami waves). In this study, a two-phase flow model is developed with the finite volume method for simulating the tsunami-like wave impinging on the PLEM. Depending on the real-world tsunami wave recorded in 2011 tsunami event, a tsunami-like wave is generated numerically depending on N-waves theory. In order to ensure the accuracy of the calculation, this model is verified against some theoretical and experimental studies firstly. Then, the hydrodynamic characteristics and forces on the PLEMs under the different tsunami-like waves are investigated systematically. Due to the flow causes strong disturbance to different parts of the PLEMs, the Fast Fourier Transform (FFT) method is adopted to analyze the irregular hydrodynamic force signals for better to understand the characteristics of forces in the frequency domain. In the simulations, different environmental and PLEM structural variables are considered, such as wave height, pipe distance, and PLEM bottom seat length. The hydrodynamic characteristics under different tsunami-like waves passing the various submarine PLEMs are discussed, which indicates that the vortex field evolutions and hydrodynamic forces under different waves on the PLEM are significantly different.INDEX TERMS Tsunami-like wave, submarine pipeline end manifold (PLEM), hydrodynamic forces, flow field, vortex.

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“…Deepwater resources have been discovered, and offshore oil and gas engineering equipment has progressed from the shallow sea to the deep ocean. The deep ocean has gradually become the main area for the development of global marine resources [3][4]. As a common component in the development of deepwater oil and gas resources, subsea anti-sinking plate foundations are used as the supporting structures for wellheads, pipe sink nodes, umbilical cord cables and other components of underwater production systems.…”

Section: Introductionmentioning

confidence: 99%

Study of the Force and Deformation Characteristics of Subsea Mudmat-Pile Hybrid Foundations

Kong

Deng

Liu

et al. 2018

Polish Maritime Research

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To study the force and deformation characteristics of subsea mudmat-pile hybrid foundations under different combined loads, a project at a water depth of 200 m in the South China Sea was studied. A numerical model of a subsea mudmatpile hybrid foundation is developed using the numerical simulation software FLAC3D. The settlement of the seabed soil, the bending moments of the mudmat, and the displacements and bending moments along the pile shaft under different load combinations, including vertical load and horizontal load, vertical load and bending moment, and horizontal load and bending moment load, are analyzed. The results indicate that settlement of the seabed soil is reduced by the presence of piles. The settlement of the mudmat is reduced by the presence of piles. Different degrees of inclination occur along the pile shaft. The angle of inclination of pile No. 1 is greater than that of pile No. 2. The dip directions of piles No. 1 and No. 2 are identical under the vertical load and bending moment and are opposite to those under the other combined loads. The piles that are located at the junctions between the mudmat and the tops of the piles are easily destroyed.

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Upper bound solutions of vertical bearing capacity of skirted mudmat in sand

Cited by 11 publications

References 17 publications

Behavior of Vertically Confined Square Footing on Reinforced Sand under Centric Inclined Loading

Behavior of Vertically Confined Square Footing on Reinforced Sand under Centric Inclined Loading

Numerical Analysis of Hydrodynamics Around Submarine Pipeline End Manifold (PLEM) Under Tsunami-Like Wave

Study of the Force and Deformation Characteristics of Subsea Mudmat-Pile Hybrid Foundations

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