The Efficiency of the Ability of Isolation Piles to Control the Deformation of Tunnels Adjacent to Excavations

Zheng, Gang; Wang, F. J.; Du, Yunfei; Diao, Yu; Lei, Yiwen; Cheng, Xuesong

doi:10.1007/s40999-018-0335-7

Cited by 37 publications

(31 citation statements)

References 25 publications

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“…Unless otherwise speci ed, the deformation values of the buildings are all from the excavation to the bottom of the pit. The support e ciency is de ned (Zheng et al 2018) to quantitatively analyze the deformation of the two schemes:…”

Section: Building Deformation Characteristicsmentioning

confidence: 99%

Evaluation of Deformation of Adjacent Buildings With Different Foundation Types Caused by Foundation Pit Excavation Under Combined Support of Isolation Pile and Diaphragm Wall

Tian

Huang

et al. 2021

Preprint

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The process of excavation and unloading of a deep subway foundation pit will cause deformation of the surrounding buildings. There are significant differences in building deformation due to different methods of supporting the foundation pit and building foundation forms. This study takes the deep foundation pit project of the station as an example to investigate this difference. A three-dimensional numerical finite element model of a deep foundation pit has been established that considers different types of building foundations (independent foundation, box foundation, and pile foundation). The sensitivity of the two supporting methods of the diaphragm wall and the combined support of isolation pile and diaphragm wall regarding the maximum settlement value of the building, the horizontal inclination value, the slope angle, and the foundation angular distortions were analyzed. Finally, the sensitivity of the length of the isolated pile to the maximum settlement value and the horizontal displacement value of different types of building foundations are discussed. The results show that the combined support method of isolation piles and diaphragm walls has the highest supporting efficiency (93.5% of independent foundations and 42.3% of box foundations) for angular distortions of shallow foundation buildings. The efficiency of pile foundation support is the lowest (31.4%). For the combined support method of isolation piles and diaphragm walls, the maximum settlement value, and the value of horizontal displacement of the building will decrease with increasing the length of isolation pile. When the depth of isolation pile is greater than 24 m, the settlement deceleration rate of the independent foundation and the pile foundation slows down; when the depth of isolation pile is greater than 27 m, the settlement deceleration rate of the box foundation will slow down, and the deceleration rate of the horizontal displacement of the independent foundation and box foundation will slow down.

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Section: Building Deformation Characteristicsmentioning

confidence: 99%

Evaluation of Deformation of Adjacent Buildings With Different Foundation Types Caused by Foundation Pit Excavation Under Combined Support of Isolation Pile and Diaphragm Wall

Tian

Huang

et al. 2021

Preprint

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show abstract

“…erefore, other means should be combined to control the retaining wall deformation. Grouting and isolation piles are two common means to protect adjacent structures in close construction [26][27][28][29][30][31]. However, in past engineering practices, the selection of grouting and isolation piles was often blind.…”

Section: Comparison Of the Protection Effect Between Foundationmentioning

confidence: 99%

The Influence of Complex Subway Station Construction on High Retaining Walls and Appropriate Countermeasures

Wang

et al. 2020

Advances in Civil Engineering

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Anzhen Bridge Station of Beijing metro line 12, which adopts a separated-island platform constructed by the undermining method, passes along the retaining wall of the North Third Ring Road. A numerical simulation method is adopted to study the deformation laws of the retaining wall under the influence of station construction. The simulation data show that the affected retaining wall will have large settlement and tilt, and countermeasures must be taken. Four countermeasures are formulated, and their control effects are analyzed. The calculation results show that the combination of anchor cables and waist beams can effectively control the tilt of the retaining wall, but the control effect on the absolute settlement is not obvious. The control effect of isolation piles is better than that of foundation grouting. The joint control method of anchor cables combined with waist beams, isolation piles, and deep hole grouting makes the deformation meet the target, and according to this measure, a concept of joint control aiming at the influence of the “source,” “propagation,” and “object” is proposed, which can provide a reference for similar projects with a great difficulty in deformation control.

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“…Wang Wenbin [15] represented the protection of a clock tower by separation pillars in Line 2 Metro in Xi'an. The literatures [16][17] specified the reinforcement mechanism of the isolation pile. Nevertheless, at present, little research has been done on how to safely protect urban subway construction close to buildings.…”

Section: State Of the Artmentioning

confidence: 99%

Study on the Reinforcement Measures and Control Effect of the Surrounding Rock Stability Based on the Shield Tunneling Under Overpass Structure

Fang¹,

Li²,

Shang³

et al. 2016

JESTR

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To study the stability of surrounding rocks for shield tunneling under overpass structures and the safety of existing bridge structures, a practical example of the method was cited through a shield tunneling project under the overpass structure between K1+110 and K1+700 on Line 2 of Shenyang Subway, China. The sub-area reinforcement was proposed according to surrounding rock deformation characteristics during shield tunnel excavation. The bridge foundation (i.e., the clear spacing to the shield tunnel is less than 2 m) was reinforced by steel support, the bridge foundation (the clear spacing is about 2~7m) used "jet grouting pile" reinforcement, whereas the bridge foundation (the clear spacing is greater than 7 m) did not adopt any reinforcement measures for the moment. For this study, the mean value and material heterogeneity models were established to evaluate the reinforcement effect from several aspects, such as surrounding rock deformation, plastic zone development, and safety factor. The simulation results were consistent with those of field monitoring. After reinforcement, the maximum deformation values of the surrounding rock were reduced by 4.9%, 12.2%, and 48.46%, and the maximum values of surface subsidence were decreased by 5.6%, 72.2%, and 88.64%. By contrast, the overall safety factor was increased by 4.1%, 55.46%, and 55.46%. This study posited that this reinforcement method can be adopted to solve tunnel construction problems in engineering-geological conditions effectively. References for evaluating similar projects are provided.

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The Efficiency of the Ability of Isolation Piles to Control the Deformation of Tunnels Adjacent to Excavations

Cited by 37 publications

References 25 publications

Evaluation of Deformation of Adjacent Buildings With Different Foundation Types Caused by Foundation Pit Excavation Under Combined Support of Isolation Pile and Diaphragm Wall

Evaluation of Deformation of Adjacent Buildings With Different Foundation Types Caused by Foundation Pit Excavation Under Combined Support of Isolation Pile and Diaphragm Wall

The Influence of Complex Subway Station Construction on High Retaining Walls and Appropriate Countermeasures

Study on the Reinforcement Measures and Control Effect of the Surrounding Rock Stability Based on the Shield Tunneling Under Overpass Structure

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