The Transverse Bearing Characteristics of the Pile Foundation in a Calcareous Sand Area

Hu, Hai Feng; Luo, Lina; Lei, Gang; Guo, Jin; He, Shao-Heng; Hu, Xunjian; Guo, Panpan; Xiao-nan, Gong

doi:10.3390/ma15176176

Cited by 3 publications

(3 citation statements)

References 30 publications

(24 reference statements)

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“…Table 1 and table 2 show the mix ratio and performance indexes of low-strength underwater non-dispersed concrete. The concrete has excellent workability, large slump, no water seepage, no stratification, good liquidity and self-compaction [16].…”

Section: Low-strength Underwater Non-dispersed Concrete Ratiomentioning

confidence: 99%

Research on the Technology of Full Cylinder Concrete Bite Pile of Deep Riprap Cofferdam

Huang,

Zhang,

2024

J. Phys.: Conf. Ser.

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In order to solve the construction problem of deep ripped-rock cofferdam occluding pile under complex geological conditions, this paper studies the occluding pile engineering of Shenzhen-Zhongshan Link Construction pipe prefabrication yard as carrier. The research contents of this paper include the formation of occlusal pile, the reasonable combination of construction equipment, the optimization of concrete mix ratio, the treatment of isolated rock and the demolition of occlusal pile, etc., forming the key technology of the construction of cofferdam concrete occlusal pile under complex geological conditions at sea. Through the construction practice, the application of this technology has obtained a good effect of water sealing, and can provide reference for subsequent similar projects.

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Section: Low-strength Underwater Non-dispersed Concrete Ratiomentioning

confidence: 99%

Research on the Technology of Full Cylinder Concrete Bite Pile of Deep Riprap Cofferdam

Huang,

Zhang,

2024

J. Phys.: Conf. Ser.

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“…As one of the most common foundation forms, it is of great significance to study the application of pile foundations to calcareous sand, especially to explore the effect of pile driving and engineering mechanical properties in calcareous sand foundations. Up to now, previous studies have mostly focused on the macroscopic mechanical properties of pile foundations in calcareous sand [20][21][22][23][24], and have mainly considered the effects of the calcareous sand particle size distribution [25], cementation degree, pile length [26,27] and load conditions [28][29][30][31][32] on the bearing characteristics of piles. McDowell et al [33], using small-size model tests on the bearing characteristics of a single pile, pointed out that the peek resistance of a single pile is a strong function of the initial particle size distribution, and the peak resistance in well-graded calcareous sand is greater than that in uniformly graded calcareous sand.…”

Section: Introductionmentioning

confidence: 99%

Pile Driving and the Setup Effect and Underlying Mechanism for Different Pile Types in Calcareous Sand Foundations

Gao,

Guo,

Yuan

2024

JMSE

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The mechanical response and deformation characteristics in calcareous sand foundations during pile driving and setup were studied using model tests combined with the technical methods of tactile pressure sensors and close-range photogrammetry. Different types of piles were considered, including a pipe pile, square pile and semi-closed steel pipe pile. The test results show that during pile driving, the pile tip resistance of different piles increases with an increase in the pile insertion depth, and an obvious fluctuation is also obtained due to the particle breakage of the calcareous sand and energy dissipation. Different degrees of particle breakage generated by different type piles make the internal stress variations different, as with the pile tip resistance. The pile tip resistance of model pile A, which simulates a pipe pile, is the highest, followed by model pile B, the simulated square pile. Model pile C, which simulates a semi-closed steel pipe pile, has the smallest pile tip resistance because its particle breakage is the most obvious and the pile tip energy cannot be continuously accumulated. The induced deformation such as sag or uplift on the surface and the associated influence range for the calcareous sand foundation are the smallest for model pile C, followed by model pile B and then model pile A. Model pile A has the most obvious pile driving effect. During the pile setup process after piling, the increase in the total internal stress of model pile B is the largest, and the improvement of the potential bearing capacity is the most obvious, followed by model pile A and model pile C. During the pile setup, the induced uplift deformation in pile driving is recovered and the potential bearing capacity increases due the redistribution and uniformity of the vertical and radial stress distributions in the calcareous sand foundation. Considering the potential bearing capacity of different model piles, the influence range of pile driving, foundation deformation and the pile setup effect, it is suggested to use a pointed square pile corresponding to model pile B in pile engineering in calcareous sand foundations.

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“…Most islands and reefs are far away from the mainland, and in the construction and engineering of islands and reefs, the cost of transporting materials from land is high, so calcareous sand is often used locally as a foundation material for infrastructure such as road embankments and airport runways [ 4 , 5 ]. Extensive research has shown that the physical and mechanical properties of marine biogenic calcareous sand are quite different from those of common terrestrial sand, and the results of existing research cannot be directly applied to calcareous sand [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Experiment Study on the Influence of Density and Confining Pressure on Triaxial Shear Properties of Calcareous Sand

Zhang

Ren²,

et al. 2023

Materials

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Calcareous sand is one of the main building materials in the construction of islands and reefs, and its shear property is very important for predicting their strength and deformation. However, the correlation research on the shear properties of calcareous sand is limited. In this paper, a series of the triaxial consolidation drainage shear tests of calcareous sand with relative densities (Dr) of 70% and 90% under confining pressures of 100, 200, 400 and 800 kPa were carried out by a triaxial testing apparatus, and the effects of relative density and confining pressure on the deformation and strength characteristics of calcareous sand were analyzed. The results show that the stress–strain curves of calcareous sand show a strain softening characteristic, and both peak deviatoric stress and failure strain increase with confining pressure, but the increase in failure strain is restrained when the confining pressure is larger than 400 kPa. The initial shear modulus of calcareous sand is positively correlated with confining pressure. Additionally, the molar circular envelope of calcareous sand is linear in the range of 100~400 kPa, but it deviates from linear when confining pressure exceeds 400 kPa. The critical state line (CSL) of calcareous sand is nonlinear, with almost the same exponent for calcareous sand with different relative densities. The research results have important reference value for the foundation construction of islands and reefs.

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The Transverse Bearing Characteristics of the Pile Foundation in a Calcareous Sand Area

Cited by 3 publications

References 30 publications

Research on the Technology of Full Cylinder Concrete Bite Pile of Deep Riprap Cofferdam

Research on the Technology of Full Cylinder Concrete Bite Pile of Deep Riprap Cofferdam

Pile Driving and the Setup Effect and Underlying Mechanism for Different Pile Types in Calcareous Sand Foundations

Experiment Study on the Influence of Density and Confining Pressure on Triaxial Shear Properties of Calcareous Sand

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