Analytical solutions to ground settlement induced by ground loss and construction loadings during curved shield tunneling

Li, Shaohua; Zhang, Mingju; Li, Pengfei

doi:10.1631/jzus.a2000120

Cited by 47 publications

(12 citation statements)

References 42 publications

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“…Existing studies have pointed out that the additional thrust, the shield shell friction, the additional grouting pressure, and the ground loss are the main factors that disturb the surrounding soil during the shield machine tunnelling process. Different 10.3389/fevo.2022.1019785 excavation parameters need to be set for the units on the inner and outer sides of the curve section to realise the deflection of the excavation axis when the shield machine tunnelling along the curve section field (Liang et al, 2018;Li and Li, 2021). The thrust of the inner cylinder will be smaller than that of the outer cylinder, and due to the extrusion of the inner soil, the friction of the inner shield will be greater than that of the outer shield.…”

Section: Soil Deformation Caused By Tunnelling Construction Factormentioning

confidence: 99%

Calculation of surface settlement and pile foundation deformation caused by shield machine tunnelling along curve section

et al. 2022

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The shield machine tunnelling along the curve section causes more disturbance to the surrounding environment than the straight section. Pile foundation is the most commonly used foundation form in high-rise buildings, and high-rise buildings have extremely high requirements for controlling non-uniform deformation. Therefore, it is necessary to study the surface settlement and the deformation law of pile foundations caused by shield machine tunnelling along the curve section. Considering the shield machine tunnelling factors along the curve section and the coupling effect of piles and soil, the analytical calculation formula of the ground settlement and the pile foundation deformation caused by the shield machine tunnelling along the curve section is deduced. According to the actual project situation, a finite difference model (FDM) is constructed, and the correctness of the FDM and analytical prediction formula is verified by comparing the on-site monitoring data. The research shows that the error among the FDM results, the analytical prediction results, and the on-site monitoring data are small, and the surface settlement and pile foundation deformation meet the construction control standards. The friction resistance of the shield shell, the integrative gap at the shield tail (IGST), and the over-cutting gap (OG) are the main factors leading to the surface settlement. However, the shield shell friction and OG are the main reasons leading to the inner settlement of the curve section being more prominent than the outer side. The difference in the pile foundation settlement on both sides of the curve section is slight, the maximum settlement difference rate is 1.8%, and the maximum horizontal deformation rate of the pile foundation on the inner and outer sides is 9.2%, which shows that the horizontal deformation of the pile foundation is more sensitive to the asymmetrically distributed construction factors.

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Section: Soil Deformation Caused By Tunnelling Construction Factormentioning

confidence: 99%

Calculation of surface settlement and pile foundation deformation caused by shield machine tunnelling along curve section

et al. 2022

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“…Deng et al [4] examined how shield tunneling along a curved segment affected the law of surface settlement, with the results of the theoretical prediction and numerical simulation being in alignment with the field monitoring data. In curved tunnels, the additional thrust, friction force, and grouting pressure were incorporated in a parametric analysis to quantify their impacts on curved tunnels [21].…”

Section: Literature Reviewmentioning

confidence: 99%

Evaluation of the Ground Settlement in an Urban Area Resulting from a Small Curvature Tunneling Construction

et al. 2022

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The transportation system is one of the major infrastructures in urban areas, and it serves 56% of the world’s population. Nowadays, metro lines are developing fast in urban areas. Due to the restrictions of urban fields, metro lines are usually not planned straight, and a curved line is required to connect stations in different locations in a city. As a result, small curvature tunnels are commonly constructed in urban areas. The tunneling construction in a city area may cause ground settlement, which is sensitive to surrounding buildings and underground utilities. The aim of this study is to explore the impact of curvature alignment on the ground settlement. In this paper, ground settlements induced by small curvature shield tunneling were evaluated by using a numerical analysis. A total of six cases were selected for the analysis. The results obtained from the numerical simulations were compared with Peck’s equation. It is observed that Peck’s equation can be used for the estimation of the maximum settlement. However, the ground settlements on both sides of the central axis of the curved tunnel are asymmetrical, and Peck’s equation, which provides a symmetrical settlement, may not be applicable in the case of small curvature tunnels.

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“…These studies mainly focused on the estimation of transverse and longitudinal settlement, horizontal displacement, volume loss, settlement trough width, subsoil movement, in ection point (i) location, overburden depth to diameter (C/D) ratio, and model and soil properties [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. Some studies have also been carried out on the type of building structure [24], building foundation [25][26] and material type [27-28], but less attention has been paid to the effects of the geometric characteristics of the building.…”

Section: Introductionmentioning

confidence: 99%

The effect of masonry buildings' geometrical characteristics on their vulnerability caused by tunneling- induced settlement

Kolivand,

Daraei

2024

Preprint

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Tunnel construction in the urban area is often a challenge due to the presence of masonry buildings. The aim of this study is to investigate the effects of the geometric characteristics of masonry buildings, on the damage caused by tunneling using numerical simulations. The results show that the width of the building is a more important factor in controlling settlement and damage to the building than its length. The analysis of the building's deformation parameters shows that the differential settlements play a greater role in damage to building. Buildings with a width of less than 10 m suffer only minor damage due to small changes in differential settlement. For buildings with a width of more than 10 m and up to 35 m, the differential settlements increase considerably and cause structural damage. The analysis shows that as the width of the building increases, mainly due to a decrease in the stiffness of the foundation, the slope and angular distortion of the foundation increase and consequently the building damage increases. Buildings with a width of less than 10 m suffered only minor damage, while buildings with a width of more than 21 m suffered structural damage. Furthermore, the tilt of the building alone is not a good parameter for assessing building damage. The length of the building has no significant influence on building damage.

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Analytical solutions to ground settlement induced by ground loss and construction loadings during curved shield tunneling

Cited by 47 publications

References 42 publications

Calculation of surface settlement and pile foundation deformation caused by shield machine tunnelling along curve section

Calculation of surface settlement and pile foundation deformation caused by shield machine tunnelling along curve section

Evaluation of the Ground Settlement in an Urban Area Resulting from a Small Curvature Tunneling Construction

The effect of masonry buildings' geometrical characteristics on their vulnerability caused by tunneling- induced settlement

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