Full‐Scale Laboratory Test of Cutting Large‐Diameter Piles Directly by Shield Cutterhead

Wang, Yuqing; Wang, Xinyu; Xiong, Yangyang; Zhuangzhi, Yang; Zhang, Jie

doi:10.1155/2022/8780927

Cited by 3 publications

(3 citation statements)

References 16 publications

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“…where, p l is the critical pressure of compaction; µ l is the corresponding volume strain. 3 Compression stage (p > p l ) At this stage, the concrete is completely compacted into a dense medium, and the relationship is as follows.…”

Section: Damage Modelmentioning

confidence: 99%

“…Due to the lack of reasonable urban underground space planning in the past, obstacles such as existing buildings and station piles are frequently encountered during the construction of subway tunnels. Traditional methods for crossing obstacles, such as piling on the ground, pulling out piles, or carrying out a pile-supported replacement, are commonly used to remove existing obstacles [1][2][3]. Although the above methods are very mature, they will extend the construction period and increase the cost.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mechanical Properties and Influencing Factors of Shield Cutting Existing Station Supporting Piles

Guan,

Liu,

et al. 2023

Sustainability

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Based on the shield-cutting existing station supporting piles project of Zhengzhou metro line 6, the process and mechanism of concrete in the process of pile cutting were analyzed by establishing a three-dimensional model of concrete with a cutter. The magnitude and variation rules of cutting force, penetration force, and tangential force were explored. The variation rules of cutting force with four factors of cutting speed, cutting depth, cutter width, and tool rake angle were explored. The correctness of the numerical model and results were verified by the theoretical analysis method. Finally, the significance of the influencing factors of pile cutting was studied by means of range analysis and variance analysis using the orthogonal test method, and the cutter parameters were optimized. The cutting mechanism is that the front concrete is compressed and crushed to produce a dense core. The cutting force increases rapidly to its maximum value in a short time during the cutting process. The cutting force is always larger than the penetration force and tangential force. The cutter contact force basically remains unchanged with the change in cutting speed; however, it increases with the increase in cutting depth and cutter width. The significant order of the three influencing factors is cutting depth, cutter width, and rake angle. It is suggested that the cutting depth be adjusted preferentially, followed by the cutter width. And the principle of rake angle should be considered last.

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Section: Damage Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Influencing Factors of Shield Cutting Existing Station Supporting Piles

Guan,

Liu,

et al. 2023

Sustainability

View full text Add to dashboard Cite

show abstract

“…The conventional artificial cleaning barrier method is somewhat costly, labor-intensive, and highly dangerous [4]. However, the direct cutting shield crossings can speed up operations, lower construction costs, and improve engineering safety [5]. It is not only a modernization strategy, but also a sustainable development model.…”

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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Numerical Analysis Study on the Influence of Shield Cutting Pile on the Settlement of Pile–Soil Composite Foundation

Cao,

Ma,

Zhang

2024

Advances in Civil Engineering

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Based on the shield cutting pile–soil composite foundation project of Zhengzhou Metro Line 5, numerical analysis was employed to replicate the in situ experimental conditions on site. The study focused on investigating the impact of shield cutting piles on the settlement of pile–soil composite foundation and analyzing the sensitivity of shield construction parameters, face pressure (P), and grouting pressure (Q). Comparing the numerical analysis results of land surface subsidence with field in situ test monitoring results reveals a consistent pattern, validating the rationality of the numerical modeling method presented in this paper. The results demonstrate that the vertical displacement of the formation caused by shield cutting pile construction can be divided into settlement and uplift areas. The region with significant formation displacement settlement spans within 0.9D (5.4 m above the tunnel vault), whereas the area with pronounced formation displacement uplift ranges within 0.58D (3.5 m below the tunnel arch bottom). The influence of face pressure (P) on the bearing characteristics of the composite foundation primarily occurs during the prepile cutting stage, whereas the influence of grouting pressure (Q) on the bearing characteristics of the composite foundation mainly manifests after the shield tail separates from the residual pile of the composite foundation.

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Full‐Scale Laboratory Test of Cutting Large‐Diameter Piles Directly by Shield Cutterhead

Cited by 3 publications

References 16 publications

Mechanical Properties and Influencing Factors of Shield Cutting Existing Station Supporting Piles

Mechanical Properties and Influencing Factors of Shield Cutting Existing Station Supporting Piles

Adaptability of a Reinforced Concrete Diaphragm Wall Cut by Disc Cutter

Numerical Analysis Study on the Influence of Shield Cutting Pile on the Settlement of Pile–Soil Composite Foundation

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