Working Mechanism of Pile Group with Different Pile Spacing in Dense Sand

Chen, Yadong; Lu, Fan; Namdar, Abdoullah; Cai, Jiangdong

doi:10.1155/2019/5376594

Cited by 9 publications

(4 citation statements)

References 68 publications

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“…Some results on the compressive bearing performance of single and double CEPs have been obtained through research [10,11]. In practical engineering, CEP pile groups are widely used [8,12]. The spacing between the piles is an important factor that affects the failure mechanism and bearing capacity of CEP groups.…”

Section: Introductionmentioning

confidence: 99%

Influence of Pile Spacing on the Compressive Bearing Performance of CEP Groups

Qian,

Cao,

Yang

et al. 2024

Buildings

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Pile spacing is an important factor affecting the bearing capacity of concrete expansion pile (CEP) groups. In this study, a pile group was simulated and analyzed using ANSYS software R19.0. The influence of pile spacing on the bearing capacity of the pile group under a vertical load was determined using three sets of four-, six-, and nine-pile models with different pile spacings. The grid division of the pile soil model adopts a mapping method, using the contact types of rigid and flexible bodies and applying surface loads to the model piles step-by-step. After vertical pressure was applied to the model pile, in-depth analysis was conducted on the displacement cloud map, pile top displacement, and other data. The different stress conditions of corner, edge, and center piles in each model group were compared and analyzed, revealing the relationship between the stress mechanism and failure law of the soil around the pile and the pile spacing. It was found that the soil displacement range of edge piles is slightly larger than that of corner piles. This phenomenon gradually decreases with increasing pile spacing. When the pile spacing increases to four times the cantilever diameter, the difference in soil displacement at different pile positions is small, and the pile spacing has little effect on the compressive bearing capacity of the pile group. Thus, it is reasonable to control the pile spacing at three to four times the cantilever diameter. In the nine-pile model, when the load is loaded to the 20-step level, the displacement value of the central pile is −72.278 mm, while the displacement values of the edge pile and corner pile are −69.012 mm and −66.806 mm. It is shown that increasing the pile spacing can effectively reduce the pile group effect and improve the bearing capacity of the pile foundation. At present, CEP pile groups are gradually being applied in practical engineering, but research on the influence of pile spacing on the compressive bearing performance of CEP pile groups is still at a very early stage. This article reinforces the influence of pile spacing on the compressive bearing performance of CEP pile groups. It provides theoretical support for its application in practical engineering.

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Section: Introductionmentioning

confidence: 99%

Influence of Pile Spacing on the Compressive Bearing Performance of CEP Groups

Qian,

Cao,

Yang

et al. 2024

Buildings

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“…From the current situation of domestic and foreign research, the study on CEP monopiles performed by domestic and foreign scholars has been perfected [2][3][4]. Many infuencing factors of CEP monopiles on the load-bearing performance and the intrinsic mechanism have been studied in depth [5], whereas research on the CEP group piles is still in the primary stage; however, most of the piles in practical engineering appear in the form of group piles [6,7], and CEP piles are gradually used in high-rise buildings, bridges, deep-sea platforms, and other projects, and many factors, such as environment and geological conditions, infuence these construction facilities. Te requirements for their bearing performance are gradually improved [8,9].…”

Section: Introductionmentioning

confidence: 99%

Simulation Analysis of the Effect of Pile Spacing on the Compressive Load-Bearing Performance of CEP Double Piles

Qian

et al. 2023

Advances in Civil Engineering

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Under the action of vertical pressure, the variation of pile spacing affects the bearing performance of concrete expanded-plate (CEP) double pile and the damaged state of soil around the pile. In this study, finite element simulation analysis is performed by ANSYS software, and six sets of semisectional double pile models with different pile spacings and one set of semisectional monopile models with the same specifications are established after applying the vertical pressure to the model pile. The mapping method is used for the pile-soil model meshing, the model adopts the contact type of rigid and flexible bodies, and the simulation analysis adopts the way of applying surface load and loading step-by-step. The displacement distribution, load-displacement curve, stress cloud, and shear stress curve are collated to obtain the displacement and stress change law of pile-soil under different pile spacings and then determine the effect of the changes in pile spacing on the CEP double pile. Meanwhile, the CEP double pile model is compared with the monopile model to determine their similarities and differences. Finally, a reasonable range of pile spacing for CEP double piles is provided. It further improves the research theory of CEP group pile compressive load-bearing capacity and provides the theoretical basis for its design and application in practical engineering.

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“…Also, the settlement of the piled raft decreased with increasing the number of piles. Chen et al [40] studied the failure mechanism of pile groups installed in sand under different pile spacing by means of laboratory experimental model tests. They stated that the narrow pile spacing was a key factor to the development of the pile tip resistance which may be useful to improve the bearing performance of the pile group at the initial stage of settlement.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Axially Loaded Pile Group Near a Sloping Ground

Alinejad

Bayat²,

Nadi³

et al. 2023

Period. Polytech. Civil Eng.

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Understanding the axial loading response of pile group located near the crest of the slope is of practical value to structural design. In this paper, a large-scale test setup (1.8 m × 0.90 m × 0.90 m) has been developed to investigate the response of pile group (2 × 2) located near the crest of the slope under axial loading. This paper presents a series of physical modelling tests performed to investigate the effects of slope angles, distance of the pile group from the slope crest, embedment length of the pile group and pile diameter on the axial loading response of pile groups. The results show that the response of pile group located near the crest of the slope approaches to the level ground condition with increasing edge distance from slope crest. In addition, the horizontal displacement of pile group towards the slope face increases with decreasing distance of pile group from the slope crest or embedded length of piles or with increasing slope angle. Furthermore, increasing pile diameter results in a low increase in the horizontal displacement for edge distances less than 3 dp (dp = pile diameter). However, the horizontal displacement is almost independent of pile diameter at edge distances greater than 3 dp. Higher embedded length results in the response of pile group approaches to the response of pile group located on the level ground at a shorter edge distance from the slope crest.

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Working Mechanism of Pile Group with Different Pile Spacing in Dense Sand

Cited by 9 publications

References 68 publications

Influence of Pile Spacing on the Compressive Bearing Performance of CEP Groups

Influence of Pile Spacing on the Compressive Bearing Performance of CEP Groups

Simulation Analysis of the Effect of Pile Spacing on the Compressive Load-Bearing Performance of CEP Double Piles

Experimental Study of Axially Loaded Pile Group Near a Sloping Ground

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