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

Wang, Ning; Jiang, Yalong; Geng, Daxin; Huang, Zhanjun; Ding, Haibin

doi:10.3389/feart.2022.896634

Cited by 8 publications

(3 citation statements)

References 36 publications

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“…The 21st century has witnessed significant advancements in underground engineering in China (Ding and Xu, 2017;Liu et al, 2020;Huang et al, 2022). Over the past two decades, numerous tunnels have been successfully constructed (Wang et al, 2022a;Zhou et al, 2022;Wang et al, 2023a). The shield tunneling technology, known for its safety and efficiency, has been extensively utilized in the construction of urban subways and municipal tunnels (Langmaack and Lee, 2016;Xu et al, 2020;Jia and Gao, 2022).…”

Section: Introductionmentioning

confidence: 99%

Impact of anti-sticking coating technology on shear strength at the clay-metal interface in cohesive strata

Liu,

Sun,

Yang

et al. 2023

Front. Earth Sci.

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The shield machine is clogged frequently when tunneling in cohesive strata. Shield clogging is closely linked to the shear strength exhibited at the clay-metal interface. To investigate the impact of anti-sticking coating technology on the shear strength at the clay-metal interface, a series of direct shear tests were conducted. The obtained test results revealed an initial increase in shear stress at the clay-metal interface as shear displacement increased, eventually reaching a state of stabilization. The shear strength exhibited a gradual increase initially, followed by a significant increase, and eventually reached a plateau with the rise in the consistency index. It was observed that the adhesion between the anti-adhesion coating and clay was relatively weak, but the presence of the anti-adhesion coating effectively reduced the risk of shield clogging.

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Section: Introductionmentioning

confidence: 99%

Impact of anti-sticking coating technology on shear strength at the clay-metal interface in cohesive strata

Liu,

Sun,

Yang

et al. 2023

Front. Earth Sci.

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“…Thus, the main part of the project is the way in which to efficiently cut off steel bars. According to incomplete statistics, the reinforced concrete pile foundations or diaphragm walls have been found in more than 20 subway construction projects in more than 10 Chinese cities [7][8][9][10][11]. The pile foundation is the most typical reinforced concrete structure in shield tunneling during the excavating process.…”

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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“…Boonsiri and Zhang et al [7][8][9][10] found that pile groups affect surface movement. Zhang et al 11 proved the feasibility of a pile foundation underpinning construction scheme when a shield tunnel passes through existing piles, studied the comprehensive influence of shield tunnelling and the old pile cutting process on underpinning piles 12 , and proposed a pile foundation underpinning technology for an oblique tunnel crossing a pile group foundation 13 . Wang and Zhao [14][15][16][17] proposed a series of strata reinforcement measures to significantly improve the deformation of existing structures and proposed a new grouting material for the pre-reinforcement of shield tunnels adjacent to existing pile foundations 18 .…”

mentioning

confidence: 99%

The influence of existing piles on station settlement during the construction of a tunnel undercrossing under existing stations

Ma,

Wu,

Chen

et al. 2024

Sci Rep

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In the construction of tunnels under existing stations, it is necessary to control their settlement. When there is a pile foundation in the existing station, the pile cutting has a significant impact on the settlement of the existing station. To determine the influence of existing piles on the settlement of subway stations, a reasonable pile-cutting time is proposed. Based on the Chengdu Metro Line 9 underpassing the existing Line 1 hatchery station, the settlement law of the tunnel underpassing the existing Line 1 station is analysed via a numerical simulation. Furthermore, the deformation and stress characteristics of the existing piles, pipe roofs, and tunnel linings and the supporting effect on the existing station are discussed. It is concluded that the cutting of existing piles causes a change in the tunnel bearing system, thus resulting in a certain deformation of the station. The influence of different pile cutting times on the settlement of the existing station is then analysed, and it is clarified that the tunnel support stiffness is significantly enhanced after the construction of the secondary lining. At this time, the settlement of the existing pile station is significantly reduced. Finally, through a field investigation, the effect of surface grouting, pipe shed, and multilayer lining on the settlement control of the existing station while the existing pile foundation exists is determined. This research can provide a reference for the settlement control and foundation underpinning of existing stations at ultra-small distances in underground excavation tunnels.

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

Cited by 8 publications

References 36 publications

Impact of anti-sticking coating technology on shear strength at the clay-metal interface in cohesive strata

Impact of anti-sticking coating technology on shear strength at the clay-metal interface in cohesive strata

Adaptability of a Reinforced Concrete Diaphragm Wall Cut by Disc Cutter

The influence of existing piles on station settlement during the construction of a tunnel undercrossing under existing stations

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