Mechanism and Law Analysis on Ground Settlement Caused by Shield Excavation of Small-Radius Curved Tunnel

Feng, Xiaobing; Wang, Peng; Liu, Shaofeng; Wei, Hao; Miao, Yinlan; Bu, Shijie

doi:10.1007/s00603-022-02819-6

Cited by 25 publications

(6 citation statements)

References 32 publications

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“…During the construction of large-diameter tunnels, the initial grout injection pressure needs to be increased to provide sufficient grout pressure and control ground settlement. However, increasing the initial grout injection pressure has the potential to cause grout overflow, surface uplift, and extreme grout pressure at other locations [48]. Alternatively, the pressure loss can be reduced during the grout flow process by increasing the number of grouting holes to maintain the stratum stability.…”

Section: Tunnel Radius Rmentioning

confidence: 99%

Pressure Model Study on Synchronous Grouting in Shield Tunnels Considering the Temporal Variation in Grout Viscosity

Ma,

Sun,

Jiang

et al. 2023

Applied Sciences

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The grout pressure in the shield tunnel tail void during synchronous grouting is the key to controlling ground settlement and restraining the segment. However, the circumferential, longitudinal, and radial distribution of grout pressure considering the temporal variation in grout viscosity has not been well explored yet. In this study, a theoretical model of grout pressure distribution and dissipation considering the temporal variation in Bingham grout viscosity was established. The simulation results of the pressure model were verified by field-measured data. The results showed that the radial and longitudinal distributions of grout pressure considering the temporal variation in grout viscosity were closer to the field-measured data. The impacts of the main parameters on the pressure distribution and dissipation were analyzed. Compared with the effect of the shield tail void thickness, tunnel radius and yield shear stress have greater effects on grout pressure during the circumferential filling phase. During the longitudinal and radial diffusion phases, the increase in soil porosity and permeability coefficient was conducive to grout diffusion. The increase in the grout viscosity reduces the pressure loss during the grout flow process. The results of this research can provide a theoretical basis for the grout design process in shield tunnels.

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Section: Tunnel Radius Rmentioning

confidence: 99%

Pressure Model Study on Synchronous Grouting in Shield Tunnels Considering the Temporal Variation in Grout Viscosity

Ma,

Sun,

Jiang

et al. 2023

Applied Sciences

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“…For example, thrust force, which plays a crucial role in advancing tunnels, is difficult to calculate using a theoretical method; rather, it can be easily incorporated into finite element modeling (FEM) [19]. With the assistance of FEM, Feng et al [20] compared numerical simulation and analytical methods to determine the ground settlement of small-radius curved tunnels. It has been verified that an increase in the radius of a curvature is inversely associated with the ground settlement [20].…”

Section: Literature Reviewmentioning

confidence: 99%

“…With the assistance of FEM, Feng et al [20] compared numerical simulation and analytical methods to determine the ground settlement of small-radius curved tunnels. It has been verified that an increase in the radius of a curvature is inversely associated with the ground settlement [20]. 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.…”

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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“…The principles of straight-line tunnel excavation inducing deformation of adjacent ground and pre-existing structures are fairly well established and further influence the field of small curvature tunnels. So far, the methods, used in predicting the ground movement, stress and response of adjacent structures due to shield tunneling along small radius curved route, are classified into three categories, including numerical simulations [14,21,30,45,48,52,55,51], on-site monitoring methods [7,39,52,58], and analytical methods [5,7,14,22,23,40]. In numerical simulation applications and researches, Zhang et al [55] suggested that inclined excavation loading could have an effect on the structural response and surface settlement produced by shield tunnels with different curvature radii.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of ground disturbance behavior during articulated shield tunneling on small radius curved routes in clays

Zhang,

Chen,

Zhang

et al. 2024

Preprint

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Current theoretical works on excavation-induced ground settlement in clays for small radius curve tunnels typically treat the shield as a continuous entity, neglecting the influence of the articulation device. Consequently, the accurate assessment of over-excavation effects resulting from changes in the small curvature shield excavation route is impossible. As regards the articulation and geometric relationship between the shield machine and tunnel excavation route, this paper develops formulae for calculating soil over-excavation amount and articulation angle at different positions during tunnel excavation. The clay soil settlement affected by multiple factors during the construction of an articulated shield is resolved via the mirror image method and Mindlin's solution, which takes into account articulation impacts. Additionally, the on-site monitoring data is utilized for comparison and verification with the proposed theoretical solution. It is demonstrated that the solution for small curvature excavation settlement involving the articulation effect achieves good conformance in predicting soil deformation. Finally, the parametric analyses are conducted to estimate the impact of the articulation device on the predicted ground settlement values in clay soil.

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Mechanism and Law Analysis on Ground Settlement Caused by Shield Excavation of Small-Radius Curved Tunnel

Cited by 25 publications

References 32 publications

Pressure Model Study on Synchronous Grouting in Shield Tunnels Considering the Temporal Variation in Grout Viscosity

Pressure Model Study on Synchronous Grouting in Shield Tunnels Considering the Temporal Variation in Grout Viscosity

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

Evaluation of ground disturbance behavior during articulated shield tunneling on small radius curved routes in clays

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