Theoretical analysis of three-dimensional ground displacements induced by shield tunneling

Jin, Dalong; Shen, Xiang; Yuan, Dajun

doi:10.1016/j.apm.2019.10.014

Cited by 40 publications

(11 citation statements)

References 42 publications

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“…where p G is the physical clearance at the shield tail when grouting is not considered,  is the grouting factor, According to Jin et al [15], the ground displacement at coordinates ( , , )…”

Section: Ground Settlement Due To Ground Loss At the Shield Tailmentioning

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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Section: Ground Settlement Due To Ground Loss At the Shield Tailmentioning

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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“…Sagaseta [24] proposed the virtual image method to predict the displacements and stress fields due to a point sink in the elastic half-space. Based on the cavity expansion/contraction theory and superposition method, the closed-form solutions of the displacement and stress related to the ground volume loss are given by Jin, et al [34]:…”

Section: Free-field Movements Induced By Ground Volume Lossmentioning

confidence: 99%

Spatiotemporal Deformation of Existing Pipeline Due to New Shield Tunnelling Parallel Beneath Considering Construction Process

et al. 2022

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In this paper, we study the effects of the shield tunnel construction on the deformation of an existing pipeline parallel to and above the new shield tunnel. We propose an analytical solution to predict the spatiotemporal deformation of the existing pipeline and consider different force patterns of the shield tunnelling, i.e., ground volume loss, support pressure, frictional force, and torsional force. The proposed method is validated by the monitoring data of Subway Line 3 of Nanchang and provides a reasonable estimation of the pipeline’s deformation. The parametric analyses are performed to study the influences on the pipeline’s deformation. The main advantage of our paper is that the spatiotemporal characteristics of the existing pipeline’s deformation are analysed, providing longitudinal deformation curve (LDC), deformation development curve (DDC), and grouting reinforcement curve (GRC). Compared with the perpendicular undercrossing project, both LDC and DDC have the same profiles and maximum values and move forward as a whole with the shield tunnel advance. Thus, the spatiotemporal deformation of the overall pipeline can be extrapolated from the deformation of two known points on the pipeline. The spatiotemporal characteristic curves combined with LDC, DDC, and GRC can suggest feasible, effective, and economical construction and grouting schemes to control the pipeline’s deformation after the deformation control standards have been determined.

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“…The computational cost of the numerical prediction would be extremely large, due to the increase of nonlinearity of the boundary value problem [37][38][39]. Therefore, the first step is to establish the surrogate model for responses of the numerical model and random variables in K-L expansion by polynomial chaos expansion (PCE) [40,41]:…”

Section: Bayesian Estimation Of Heterogeneity With Polynomial Chaos Ementioning

confidence: 99%

Conditions of Hydraulic Heterogeneity under Which Bayesian Estimation is More Reliable

Yang

Chen

Zhang

et al. 2020

Water

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Natural heterogeneity of soil hydraulic properties is significant for the design and construction of geotechnical structures, and should be adequately characterized. Accurate measurements of hydraulic properties remain a difficult job and do not always work well for further design and analysis. Field hydraulic monitoring data reflects the overall slope performance and provide a more representative estimation of in-situ soil hydraulic properties for back analysis. The objective of this study is to explore the conditions under which monitoring data can provide reliable estimates of hydraulic parameters. Different distributions of soil heterogeneity generate a total number of 500 sets of synesthetic monitoring data. Bayesian inversion with the integration of Karhunen-Loève (K-L) and polynomial chaos expansion (PCE) is chosen to estimate the spatially varied saturated coefficient of permeability ks. The results show that the method is accurate and reliable, with less than 3% percentage error and 0.08 coefficient of variation (COV) around the monitoring points. There are two characteristics of the best-estimated fields. First, the ranges of ks for best-estimated fields are much narrower than the worst estimated fields. Second, when the larger ks values are distributed in the unsaturated zone of slope crest, it will lead to the best estimation. It is suggested that monitoring data can provide a reliable estimation of heterogeneous ks when the ratio of ground surface flux to ks in the unsaturated zone of slope crest is less than 1/150. Small values of ks in the slope crest result in the response of pressure head far from the responses of homogenous ks in the unsaturated zone. This complex response of the pressure head further causes the ill identification of ks by Bayesian estimation.

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Theoretical analysis of three-dimensional ground displacements induced by shield tunneling

Cited by 40 publications

References 42 publications

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

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

Spatiotemporal Deformation of Existing Pipeline Due to New Shield Tunnelling Parallel Beneath Considering Construction Process

Conditions of Hydraulic Heterogeneity under Which Bayesian Estimation is More Reliable

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