Estimation of the compression and tension loads for a novel mixed-in-place offshore pile for oil and gas platforms in silica and calcareous sands

Spagnoli, Giovanni; Doherty, Paul; Murphy, G.; Attari, Azadeh

doi:10.1016/j.petrol.2015.10.032

Cited by 14 publications

(3 citation statements)

References 12 publications

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“…Another parameter in this model is Eur ref , which is the reference unloading/reloading stiffness modulus [22,23].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study on the Behaviour of Silica Sand Slope Model Subjected to Surcharge Load

Ahmad Ishak,

Jelani,

Wong

et al. 2023

Jurnal Teknologi

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Natural disasters such as landslides are becoming more frequent due to global warming. Because of the more frequent occurrences of natural disasters, there is an urgent need for researchers in geotechnical engineering to conduct slope stability analysis. This paper presents the findings of a laboratory experiment and numerical analysis of the behaviour of silica sand under static loading conditions. The laboratory experiment modelled a small-scale slope in a 500mm wide, 1000mm high and 1500mm long acrylic box. The numerical modelling in the experiment employed, Finite Element Modelling (FEM), Plaxis 3D, and the Hardening Soil Model (HSM). The researchers conducted a consolidated-drained (CD) triaxial compression test to determine the parameters of the silica sand. The FEM results are similar to the test results for the maximum loading conditions of 9.6kN/m2. The experimental observation revealed that applying a surcharge load on the top of the slope surface resulted in deformation and bulging. These observations were consistent with and validated the experimental and numerical results. The results of this study will be used to investigate the application of a proposed prototype inclinometer sensor for slope monitoring technology.

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“…Another parameter in this model is Eur ref , which is the reference unloading/reloading stiffness modulus [22,23].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study on the Behaviour of Silica Sand Slope Model Subjected to Surcharge Load

Ahmad Ishak,

Jelani,

Wong

et al. 2023

Jurnal Teknologi

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“…In the earliest period, Angemeer et al (1973) used the field static load test to study the bearing characteristics of the driven pile in the coral reef stratum, and it was found that the side friction resistance of the steel pile was very low; through the test of driving pile with openings, the ultimate side friction measured by Dutt and Cheng, (1984) was only 9.2 kPa at the lowest level; Datta et al (1980) evaluated the bearing capacity of pile foundation in calcareous sand, and they found that the surface friction might be overestimated in the project because that the end bearing may not be fully utilized. During the piling process of the driven pile, the coral sand particles around the pile are damaged to a large extent, which will make the bearing capacity decrease, and even cause pile sliding (Poulos, 1988); Based on the deep mixing technology, Igoe et al, 2014;Spagnoli et al (2015) proposed a new type of cast-in-place pile with steel casing inside, and systematically studied its bearing capacity. Although the cast-in-place pile can significantly increase the side friction resistance of the pile (Lee and Poulos, 1991) and has little impact on the shape of coral sand around the pile, it has the disadvantages offs high cost and long period.…”

Section: Introductionmentioning

confidence: 99%

Mechanical behavior analysis and bearing capacity calculation of CFG pile composite foundation on coral sand site

Zhang

Zhao

et al. 2023

Front. Earth Sci.

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Coral sand foundation formed by hydraulic fill often faces the problem of poor bearing capacity. This paper proposed for the first time to apply CFG pile composite foundation to coral sand sites to verify the feasibility of this scheme and understand its mechanical characteristics. Firstly, taking on-site coral sand as the research object, a pile sand interface shear test was conducted to clarify the mechanism of pile side friction. At the same time, the ultimate bearing capacity of CFG pile and its composite foundation was measured through in-situ static load tests. Then, based on the strength parameters of the pile sand interface revealed by indoor tests, numerical simulations were conducted to analyze the bearing characteristics of CFG piles and their composite foundations. Finally, a method for calculating the vertical bearing capacity of rigid piles in composite foundation considering interface parameters was proposed. The results showed that the bearing capacity characteristic values of single pile and composite foundation meet the design requirements; The interface friction angle and cohesion together increased the ultimate side friction by 64.41%; The load is mainly borne by the pile tip resistance, and the increase of the interface friction angle will make the proportion of the side friction load first increase and then decrease more obviously; The pile soil stress ratio first increased and then tended to stabilize as the interface strength increased. Compared with the field static load test results, the rationality of the calculation method for composite foundation rigid piles was verified. This study may have reference significance for the design and construction of coral sand foundation treatment in offshore island and reef projects.

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“…Recently, the mechanical properties of calcareous sand, such as fall velocity, critical shear stress, drag coefficient, and transport rate, have been extensively studied [9][10][11]. e engineering behavior of calcareous sands was evaluated by the bearing capacity and settlement of slide-resistant piles [12][13][14][15]. Wang [16] conducted a drawing test of driven steel pile in the lightly cemented calcareous sand foundation in the Gulf of Suez and proposed that the formation process, degree of cementation, and particle breakage of calcareous sands were the main factors affecting the bearing characteristics of the foundation.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Engineering Properties of Cement‐Stabilized Calcareous Sand Foundation

Chai

Jiang

Wang

et al. 2021

Advances in Materials Science and Engineering

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Calcareous sand is widespread around Nansha Islands, South China Sea. In oceanic and coastal engineering, calcareous sand is usually used as a building foundation and backfill material for airport runway embankments. The engineering characteristics of calcareous sand is different from terrigenous sand because of its irregular grain shape, lower particle strength, and internal voids, which have caused many engineering problems in the last decades. Cement-stabilized soil, as a common foundation reinforcement method, can solve these engineering problems and improve the foundation strength effectively. Therefore, it is very important to estimate the engineering characteristics of cement-stabilized calcareous sand foundations. In this paper, the basic engineering characteristics, bearing capacity, and deformational behavior of calcareous sand were studied by carrying out a series of tests on cement-stabilized calcareous sand. It is found that: (1) the uniaxial compression strength of calcareous sand is higher than that of Guangzhou soft soil but lower than that of filter medium quartz sand; (2) the deformation of the calcareous sand under compression is mainly plastic, and the elastic deformation gradually increases with increasing cement content; (3) the apparent cohesion of calcareous sand increases, while internal friction angle decreases with increasing cement content; (4) cement-stabilized method can significantly improve the bearing capacity of calcareous sand foundation, especially for the saturated state. A cement content equal to or more than 15% and a thickness of 1/8 of the foundation can effectively improve the bearing capacity of the foundation; and (5) the ultimate bearing capacity of the foundation by numerical calculation is higher than that by experiments, while the settlement by calculating is lower.

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Estimation of the compression and tension loads for a novel mixed-in-place offshore pile for oil and gas platforms in silica and calcareous sands

Cited by 14 publications

References 12 publications

Experimental and Numerical Study on the Behaviour of Silica Sand Slope Model Subjected to Surcharge Load

Experimental and Numerical Study on the Behaviour of Silica Sand Slope Model Subjected to Surcharge Load

Mechanical behavior analysis and bearing capacity calculation of CFG pile composite foundation on coral sand site

Investigation of Engineering Properties of Cement‐Stabilized Calcareous Sand Foundation

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