Experimental study on monotonic and cyclic lateral behavior enhancing mechanism of semi-rigid pile under different foundation reinforced methods in clay

Dai, Guoliang; OuYang, Haoran; Gao, Luchao; Guo, Qingqing; Gong, Weiming

doi:10.1016/j.oceaneng.2023.113955

Cited by 14 publications

(9 citation statements)

References 22 publications

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“…In the case of laterally loaded monopiles for OWTs, reinforcing the shallow soils is more economical. A few scholars have studied cement-reinforced monopiles in the waters of China, which is required owing to the poor soil conditions in this sea area [3,[7][8][9][10]. He et al [11] investigated cement-reinforced slender piles under static lateral load by field tests and finite element method (FEM) based on the concrete damage plasticity (CDP) model, and proposed its progressive damage mechanism.…”

Section: Introductionmentioning

confidence: 99%

“…Using FEM, they found that cement reinforcement reduced the accumulation of pile deformation and stiffness degradation, and optimized the range of cement reinforcement. Dai et al [9] considered different cement-grouting methods and found that jet-grouting provided the greatest improvement. Ouyang et al [10] developed modified p-y curves for cement-reinforced monopiles in soft clay based on a laboratory model test.…”

Section: Introductionmentioning

confidence: 99%

“…Traditional cement grouting is generally significantly effective [3,[7][8][9][10][11][12][13]; however, it releases a large amount of carbon dioxide during production, which is not environmentally friendly. In recent years, a new alternative has emerged in the form of microbially induced carbonate precipitation (MICP) technology.…”

Section: Introductionmentioning

confidence: 99%

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Numerical simulation of offshore monopiles with reinforcement in shallow soil layer

Zhu,

He,

Guo

2024

IOP Conf. Ser.: Earth Environ. Sci.

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With the development of large-scale offshore wind turbines (OWTs), monopile foundations require larger diameter and greater embedded depth to satisfy the higher bearing requirements. Large-diameter monopiles for OWTs are mainly loaded horizontally, and the horizontal resistance provided by the shallow soil plays an important role in the loading of the monopile foundation. Therefore, shallow soil reinforcement (such as cement grouting and bio-grouting) is an effective method to improve the bearing capacity of the monopile. In this study, the lateral static loading mechanism of a shallow-layer reinforced monopile was investigated by finite element method (FEM). The effect of reinforcements with different stiffness values (elastic modulus), different strengths (cohesion and friction angle) and different reinforced ranges (width and depth) was analyzed on the lateral bearing capacity, deformations, soil resistances, and soil resistance per unit length to pile deflection (p-y) curves of monopiles. Based on the numerical results, an empirical formula was proposed for predicting the reinforcement coefficient of the bearing capacity. The effects of different reinforcement parameters on the distribution of soil resistance were analyzed, and the soil resistances obtained by FEM were compared with those from a theoretical formula. It was found that the resistance provided by the reinforced soil was clearly reduced at the interface with the unreinforced soil, and the resistance of the unreinforced soil was not significantly affected by the reinforced soil.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical simulation of offshore monopiles with reinforcement in shallow soil layer

Zhu,

He,

Guo

2024

IOP Conf. Ser.: Earth Environ. Sci.

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“…conditions and construction methods, optimized the load-bearing capacity detection means, and proposed the methods for improving the load-bearing capacity of pile foundation. Gong et al (Wen et al, 2020;Hou et al, 2021;Dai et al, 2023;Gong et al, 2023) carried out a study on the improvement of load-bearing capacity of tubular piles by post-grouting technique, and they analyzed the pile friction resistance and pile-soil relative displacement by changing the postgrouting position and grouting material. Gong et al (Gong et al, 2023) used end-side joint post-grouting technique to improve the load-bearing capacity of the pile foundation.…”

Section: Introductionmentioning

confidence: 99%

“…They pointed out that the post-grouting significantly increased the load-bearing capacity of the pile foundation and reduced the relative displacement required to mobilize the vertical resistance of the test pile. For the floating pile phenomenon caused by rapid pile sinking of precast tubular piles in deep saturated cohesive soil layer, Qiang (Dai et al, 2023) implemented a post-grouting reinforcement programme for prestressed concrete precast tubular piles in the field. The results showed that the post-grouting technique can effectively eliminate the unfavorable effects of floating piles, and the load-bearing capacity of a single pile was greatly improved.…”

Section: Introductionmentioning

confidence: 99%

Study on load-bearing behaviors of prestressed post-grouting tubular piles in the karst region of northern Fujian Province, China

Huang,

Gao,

Chi

et al. 2024

Front. Earth Sci.

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The karst that is dominated by medium-weathered limestone and caves with various spatial features is widely distributed in the northern Fujian Province. This paper discusses the load-bearing behaviors of post-grouting tubular piles in karst region of north Fujian Province with reference to the prestressed tubular piles adopted in the residential buildings of Haixi Comprehensive Trade City Phase II Project in Sanming City. The load-settlement curve, pile side friction resistance, and pile end resistance of tubular piles are analyzed by finite element numerical simulations and field static load tests. The load-bearing behaviors of prestressed tubular piles under karst geological conditions with two different spatial features are comparatively investigated, and the effectiveness of tubular pile reinforcement is verified by field settlement observation. The results reveal that the finite element numerical model can effectively simulate the tubular pile-soil interaction. The use of pile end post-grouting of prestressed tubular piles in the karst region can significantly increase their load-bearing capacities. The top settlements of grouted tubular piles under the maximum test load can be reduced by 16.8%–22.3% compared with these of ungrouted test piles, and the theoretical simulated ultimate load-bearing capacity can be increased by 27.3%. The adoption of pile end post-grouting technique can reduce the pile end displacement of tubular piles and improve the proportion of pile end resistance. Plastic-hard plastic breccia silty clay can be used as a bearing stratum for post-grouting to achieve excellent grouting performance. The bead-shaped karst caves are more unfavorable to the exertion of load-bearing capacity of the tubular piles than the karst caves filled with plastic-hard plastic breccia silty clay to which the piles have direct access. The field monitored average settlements of the 19# and 17# buildings under karst geological conditions with two different spatial features are −12.88 mm and −8.98 mm, respectively, both of which do not exceed the warning value, indicating that it is feasible for the project to adopt the pile end post-grouting technique of the tubular piles. The achievements of this study help to further reveal the load-bearing mechanism of this type of pile, which can provide a basis for its engineering design and construction optimization.

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Analytical approach for lateral dynamic behaviours of pipe piles enhanced by cement-improved soil in unsaturated ground

Liu,

Dai,

Zhou

et al. 2024

Acta Geotech.

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Experimental study on monotonic and cyclic lateral behavior enhancing mechanism of semi-rigid pile under different foundation reinforced methods in clay

Cited by 14 publications

References 22 publications

Numerical simulation of offshore monopiles with reinforcement in shallow soil layer

Numerical simulation of offshore monopiles with reinforcement in shallow soil layer

Study on load-bearing behaviors of prestressed post-grouting tubular piles in the karst region of northern Fujian Province, China

Analytical approach for lateral dynamic behaviours of pipe piles enhanced by cement-improved soil in unsaturated ground

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