Experimental and Application Study on Underpinning Engineering of Bridge Pile Foundation

Liu, Yan; Wang, Gang; Chen, Min; Yue, Kefeng; Li, Qingning

doi:10.1155/2018/5758325

Cited by 11 publications

(5 citation statements)

References 9 publications

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“…During loading, the interface between the column and the beam would also be prone to failure. Yan et al [25] studied the shear and slide characteristics of the joint and developed a revised method for determining shear capacity using three local node models of the underpinning structures with a similarity ratio of 1/1. Horpibulsuk et al [26], Wang et al [27], Kou.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation on Pile Foundation Underpinning Structure System in Urban Overpass

Yan,

Gou,

Guo

et al. 2023

Materials

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In view of the complexity of the pile foundation underpinning structure system and the stringent requirements of the construction process, this paper briefly describes the necessity of introducing epoxy resin reinforcing adhesive of planting rebar in the design of pile foundation underpinning beam structure to improve the mechanical properties of the reinforced beam new and old concrete joint surfaces and proposes a new type of pile foundation replacement beam system construction method by “chiseling + prestressed reinforcement + epoxy resin reinforcing adhesive”. This paper uses an actual pile foundation underpinning project of an urban overpass as a prototype, designs and creates a model structure with a similarity ratio of 1/6, and performs repeated progressive static loading tests to study the load carrying capacity, displacement change, and other properties of the strengthened replacement structure, as well as analyses and distorts the overall working performance and failure mode of them. On this basis, the prototype structure’s finite element analysis model was built, and the finite element analysis results were compared with the test results to obtain the mechanical properties and deformation characters of the actual pile foundation underpinning structure system corresponding to the actual underpinning beam load. This paper’s study can lay the theoretical and experimental foundation for the smooth development of similar projects.

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Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation on Pile Foundation Underpinning Structure System in Urban Overpass

Yan,

Gou,

Guo

et al. 2023

Materials

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“…The pile foundation is the most typical reinforced concrete structure in shield tunneling during the excavating process. The strongest grade of concrete is C40, the largest primary reinforcement diameter in the pile is 32 mm, the largest number of cutting piles is 137, the largest cutting pile diameter is 1500 mm, and the longest cutting pile diameter is 48 m. The pile group can essentially be removed during the operation through the transformation of the shield cutter and the reinforcement or underpinning of the pile foundation [12][13][14]. However, some problems still cannot be solved, such as excessive cutter wear or collapse, reinforced winding cutterhead, and building inclination [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Adaptability of a Reinforced Concrete Diaphragm Wall Cut by Disc Cutter

Chen

Peng

2022

Sustainability

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On the background of a subway project in Suzhou City of Jiangsu Province and targeting the engineering difficulty of disc cutters cutting reinforced concrete walls, this paper illustrates the adaptability of a reinforced concrete diaphragm wall cut by disc cutter through conducting related laboratory tests and numerical simulations. When cutting a reinforced concrete diaphragm wall, the cutter should use the low-penetration depth excavation pattern with the depth of the penetration kept within 10 mm/r. In order to keep the torque in a small floating range, the cutterhead driving speed and thrust should be strictly controlled during the cutting period. Three types of fracture surface after the cutting operation, namely, single-side rolling destroy, double-sided rolling destroy, and brittle destroy. The percentage of the length of the cut steel bar smaller than 60 cm can reach 44.2% when the driving parameters of the disc cutter are well regulated. The simulation results show that the deeper the penetration, the more unstable the cutting load. The relationship between the normal force of the disc cutter and the penetration depth was linear, and the trend of the simulated value was comparable with the experimental one, which ensures the rationality of this pattern. The cutter spacing had little impact on the cutting results when it was wider than 80 mm.

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“…Yao et al (2012) analyzed the pile foundation underpinning scheme for Beijing Metro Line 8 using the finite difference software of FLAC 3D , indicating the effectiveness of pile foundation underpinning in reducing the deformation of structures and isolating piles. Combining theoretical calculations and field model tests, Yan et al (2018) obtained the shear formula of a pile foundation underpinning structure to calculate the shear bearing capacity of the structure. Based on the practical shield cutting pile engineering case, in which bridge piles with a largediameter of 14 m were cut by a shield machine, analyzed the effect and mechanism of cutting piles, the characteristics of cutting parameters and the damage law of cutting tools through field tests.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Combined Influence of Shield Tunneling and Pile Cutting on Underpinning Piles

et al. 2022

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In this study, the combined influence of shield tunneling and the old pile cutting process on underpinning piles is investigated through finite element method (FEM) modeling based on a shield tunnel project in Nanchang Metro Line 2, China. Numerical models have been developed to analyze the influence of intersection angles and the vertical distance between the underpinning foundation and tunnels on the mechanical responses of underpinning piles during tunnel excavation. Simulation results show that the bending moment of the underpinning piles decreases with increasing vertical distance between the pile and tunnel, and is inversely proportional to the intersection angle between the underpinning beam and tunnel. In addition, the maximum pile bending moment occurs in the buried depth of the tunnel axis, indicating a high risk of damage in this part. According to the simulation results, more attention should be given to the underpinning piles in case a small vertical distance and intersection angle are encountered.

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Experimental and Application Study on Underpinning Engineering of Bridge Pile Foundation

Cited by 11 publications

References 9 publications

Experimental and Numerical Investigation on Pile Foundation Underpinning Structure System in Urban Overpass

Experimental and Numerical Investigation on Pile Foundation Underpinning Structure System in Urban Overpass

Adaptability of a Reinforced Concrete Diaphragm Wall Cut by Disc Cutter

Numerical Investigation of the Combined Influence of Shield Tunneling and Pile Cutting on Underpinning Piles

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