Estimation of transverse ground surface settlement induced by DOT shield tunneling

Gui, Meen-Wah; Chen, Shong-Loong

doi:10.1016/j.tust.2012.08.003

Cited by 52 publications

(20 citation statements)

References 15 publications

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“…Many studies have indicated that the simulation result which Drucker-Prager model is adopted is close to the monitoring data. [16][17] The internal frictional angle of two main layers around the tunnel are 13.0° and 23.8°, respectively. Therefore, in this paper Drucker-Prager model is used in simulating the deformation and stability of the soils and retaining structures.…”

Section: Numerical Model and Parametersmentioning

confidence: 99%

Numerical Simulation of a Deep Excavation near a Shield Tunnel

et al. 2018

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A conveyance water shield tunnel under the Yangtze River, which was designed for the Jiangsu Changshu Power Plant Co., Ltd., was damaged due to water leakage and submersion. In order to complete the engineering, the shield tunnel should be repaired, and the connection between the shield and standpipes should be completed. Therefore, a deep excavation recovery program was designed. According to the excavation design, the distance between the axes of the two tunnels is only 20.8 m, but the depth of excavation reaches 15.1 m. Because of the small distance between the deep excavation and the adjacent west line tunnel, the new excavation in the east line tunnel might have large effects on the west line tunnel, and the environmental effects on the west tunnel due to the excavation should be evaluated. Simulations using 3D and 2D finite element methods were performed. The variations in the loads and lateral deformations on the retaining structures due to earth pressure differences outside and inside the foundation pit were analyzed in detail. The environmental effects on the west line tunnel due to deep excavation were evaluated. The 2D and 3D numerical simulation results were compared. The numerical simulation results agree with practical engineering and are applicable and reliable.

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Section: Numerical Model and Parametersmentioning

confidence: 99%

Numerical Simulation of a Deep Excavation near a Shield Tunnel

et al. 2018

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“…Deformation characteristics attributed to the oblique passing of a newly built twin tunnel underneath an existing tunnel were studied by Lin et al [7] by focusing on discussing the variation trends of a ground settlement trough and the soil pressure acting on an existing tunnel during the shield tunneling. Then, they further derived the lateral deformation, internal force, and torsion characteristics of existing tunnels caused by a new tunnel excavation.…”

Section: Introductionmentioning

confidence: 99%

“…To sum up, the studies on spatially overlapping tunnels remain concentrated on the effects of tunnel excavation on the ground surface [7,[10][11][12][13], on the existing buildings [3,4], and on the existing tunnels [5,6,[14][15][16]. In particular, the studies cover the interactions between the following four systems: spatial arrangement between tunnels, tunnel geometric parameters, key technical parameters of tunnel construction, and engineering geological conditions.…”

Section: Introductionmentioning

confidence: 99%

Numerical Parametric Study of Countermeasures to Alleviate the Tunnel Excavation Effects on an Existing Tunnel in a Shallow-Buried Environment near a Slope

et al. 2020

Applied Sciences

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This paper studies the influence law of existing tunnels on the construction of intersecting new tunnels in a shallow slope burial context through 3D numerical analysis. The emphasis is on exploring the effect of new tunnels constructed in 54 conditions, including three ratios of overburden to tunnel height (C/H), three ratios of slope distance to tunnel span (D/W), two backfilling conditions of the existing tunnel (“hty” and “htn” conditions), and three magnitudes of surface loads (10 kPa, 20 kPa, and 30 kPa), on the deformation of lateral slopes and the overlying road. As the results show, the rigidly separated area between the existing and newly built tunnels in parallel to the excavation direction was precisely the sensitive area affected by the existing tunnel backfilling condition. The road settlement simulations perpendicular to the excavation direction revealed that various C/H and D/W ratio combinations controlled the shape and size differences of the settlement trough curve. This was because the C/H ratio primarily controlled the effective span and height transition of the newly built tunnel, whereas the D/W ratio mainly controlled the intersection position of the tunnels. Next, model A-A (“hty” condition) was identified as the only feasible construction model among all models in accordance with the engineering safety control criteria. Lastly, comparison of monitoring data with simulations found a slight difference in the distribution pattern between the two. Nevertheless, the final maximum settlement fully satisfied the construction control requirements overall. Aside from proving the correctness of simulation results, the present study also sets an excellent referential example for similar projects.

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“…Numerical methods, limit analysis, empirical equations, stochastic medium theory, and experimental methods are usually employed to investigate the mechanical ground responses or behaviors of the segmental lining of noncircular shallow tunnels. Although numerical methods, such as the finite element, finite difference, discrete element, and boundary element methods, can provide useful answers, the insight into the nature of these problems that can be gained from analytical solutions cannot be overlooked .…”

Section: Introductionmentioning

confidence: 99%

Analytical study of ground responses induced by the excavation of quasirectangular tunnels at shallow depths

Zeng

Wang

Jiang

2019

Num Anal Meth Geomechanics

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Summary The construction of quasirectangular tunnels at shallow depths is becoming increasingly common in urban areas to efficiently utilize underground space and reduce the need for backfilling. To clarify the mechanical mechanism of the stresses and displacements around the tunnels, this study proposes analytical solutions that precisely account for quasirectangular tunnel shapes, the ground surface, the tunnel depth, and the ground's elastic/viscoelastic properties. The Schwarz alternating method combined with complex variable theory is employed to derive the elastic solution, and convergent and highly accurate solutions are obtained by superposing the solutions in the alternating iterations. Based on the solution and the extended corresponding principle for the viscoelastic problem, the time‐dependent analytical solutions for the displacement are obtained for the ground assuming any viscoelastic model. The analytical solutions agree well with the finite element method (FEM) numerical results for models that are completely consistent, and qualitatively agree with field data. Furthermore, based on the stress solution combined with the Mohr‐Coulomb failure criterion, the predicted initial plastic zone and propagation directions around the tunnels are qualitatively consistent with those determined by the limit analysis. A parametric study is performed to investigate the influences of the rectangular/quasirectangular tunnel shape, burial depth, and supporting pressure on the ground stresses and displacements.

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Estimation of transverse ground surface settlement induced by DOT shield tunneling

Cited by 52 publications

References 15 publications

Numerical Simulation of a Deep Excavation near a Shield Tunnel

Numerical Simulation of a Deep Excavation near a Shield Tunnel

Numerical Parametric Study of Countermeasures to Alleviate the Tunnel Excavation Effects on an Existing Tunnel in a Shallow-Buried Environment near a Slope

Analytical study of ground responses induced by the excavation of quasirectangular tunnels at shallow depths

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