A study on large volume losses induced by EBPM tunnelling in sandy soils

Le, Binh Thanh; Nguyen, Thi Thu Tra; Divall, S.; Davies, M.C.R.

doi:10.1016/j.tust.2022.104847

Cited by 10 publications

(8 citation statements)

References 60 publications

(83 reference statements)

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“…At the same time, MIDAS-GTS can output combined envelope results such as vectors, section output clouds, and tables for analysis. Thus, in comparison to the methods used by Le et al [6], Chen et al [17], and other scholars, MIDAS-GTS have a better advantage in 3D modelling. Therefore, this study focuses on a section of Changsha Metro Line 3 in China.…”

Section: Introductionmentioning

confidence: 80%

“…Meanwhile, Suk min Kong et al [5] compared the vibration measurement values generated when excavating the top surface using the existing NATM construction method and the TBM and NATM parallel construction methods, based on the vibration measurement data of the excavation site and using the NATM construction method; the vibration reduction effect of the two construction methods was analysed through 3D numerical analysis. Le et al [6] proposed an equation describing the relationship between volume loss and the liquefaction potential index by monitoring field data obtained during the construction of the Binh Thanh-Su Tien tunnel on line 1 of the Ho Chi Minh City metro in Vietnam, which was used in practice as an indicator of potential large settlements caused by EBP tunnel boring machines in sandy soils. Jie et al [7] examined the performance of blades made from 42CrMo low-alloy steel after different heat treatments, contributing valuable insights to fault prevention and cost reduction in shield machines.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on the Stress and Deformation Evolution Laws of Shield Tunnelling through a Mining Tunnel Structure

Zhou

Fei

2023

Applied Sciences

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In the construction of a shield crossing an existing mined tunnel without load, it is imperative to develop corresponding design standards that reflect actual engineering force characteristics to ensure the successful completion of the tunnel construction. This study uses the MIDAS-GTS NX 2022 finite element software to facilitate the creation of a numerical model of a shield structure for an air-push-over mine tunnel project in Changsha, China while investigating the stress field’s evolution during shield construction and calculating the maximum positive and negative bending moments and maximum axial forces for different structures and other force states under various construction conditions. This study’s findings informed the design and construction optimisation of a shield tunnelling empty-push method. The outcomes of this numerical simulation led to several key findings: (1) The soil density exerted a significantly greater impact on the internal forces of the initial support structure than both the tunnel depth and soil Poisson’s ratio. Additionally, a sudden shift in internal forces occurred within the 300–350 mm range when the lining thickness was altered. (2) Factors such as the tunnel depth, soil density, soil Poisson’s ratio μ, and lining thickness similarly influenced the internal forces of the segment and the initial support. Notably, the backfill layer thickness significantly affected the segment’s maximum axial force, causing an abrupt change of approximately 300 mm. (3) It is essential to control the guide rail’s thickness under the shield machine equipment’s weight constraint to prevent it from becoming overly large.

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Section: Introductionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Investigation on the Stress and Deformation Evolution Laws of Shield Tunnelling through a Mining Tunnel Structure

Zhou

Fei

2023

Applied Sciences

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“…The 𝐾 data at the surface for tunnelling in clay is concentrated between 0.5 and 0.7 and this offset continues with depth. The 𝐾 values for clay is considerably wider than those for tunnelling in sand in which 𝐾 ranges between 0.25 and 0.45 (Le et al, 2023;Mair, 2008;Mair & Taylor, 1997).…”

Section: Extent Of Settlement Plotmentioning

confidence: 94%

“…the Jubilee Line Extension; Nyren, 1998). In addition, it is worth noting that the observed pattern is only applicable to tunnelling in clay and there have been a few case studies of tunnelling in sand where the 2 nd tunnel induced smaller volume losses (Le et al, 2023).…”

Section: Magnitude Of Settlement Plotmentioning

confidence: 95%

Twin-tunnelling: Case studies in clay

Divall,

Goodey,

et al. 2023

JMES

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New developments in the theory and practice of tunnel construction are essential for the industry to progress but it is the relationship between these two areas that is equally as important. Tunnelling practice has greatly benefited from laboratory research; specifically, centrifuge modelling linked with field measurements. The wide body of work on the construction of single tunnels has led to the identification of parameters and techniques that are widely accepted for predicting and assessing the magnitude and extent of tunnelling ground movements. However, the usage of twin tunnels in urban areas for transportation purposes have increased and better understanding on the associated ground displacements are required. This paper firstly provides background to ground displacements due to single tunnel, twin tunnel constructions and common prediction methods used in practice. Then, it introduces recent technological advancements in centrifuge modelling, applied to the complex geotechnical events of twin-tunnelling, that has led to further insight. The tunnelling induced ground displacements obtained from twenty four case studies in clay around the world and eighteen centrifuge tests are presented for further analyses. From that, a comparison between the recent theories of proximity-dependent tunnelling-induced ground movements with case histories has been carried out to establish their validity and limitations. Published field measurements have been reanalysed taking into account newly discovered relationships between the tunnels’ proximity and the magnitude and extent of ground movements, reflected via volume loss and the settlement trough width, respectively. The applicability to field measurements of the additional volume loss prediction method (derived from consideration of the experiment work) for tunnelling in clay is assessed.

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“…The HS model allows for the yield surface to expand in the deviatoric (Principal) stress space to accommodate the excess plastic strains. This helps to compute observable characteristics such as densification (volume loss) during excavation and the stress-dependent stiffness and plastic yielding, which inevitably leads to irreversible strains [28,29], both of which M-C fails to consider.…”

Section: Hardening Soilmentioning

confidence: 99%

Tunnelling with Full-Face Shielded Machines: A 3D Numerical Analysis of an Earth Pressure Balance (EPB) Excavation Sequence Using the Finite Element Method (FEM)

et al. 2023

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Urban tunnelling can be highly challenging, especially in areas where limited ground settlements and environmental disturbance is required. Mechanised tunnelling is usually preferred in such ground environments, specifically Slurry or EPBM (Earth Pressure Balance Machine), depending on the ground properties. Being able to predict the anticipated tunnel behaviour at the preliminary stages of the project can be very beneficial in optimising not only the design, but also control the construction activities and completion times. In practice, the short-term excavation response and support performance focus primarily on design, since most site characterisation inputs are focused on material properties gained from short-term testing. Although the analysis of tunnelling is a three-dimensional (3D) problem, conventional approaches and design methods employed during the design and construction of underground openings are often based on the ground’s static response in two dimensions (2D). In this paper, an initial 2D model is generated in PLAXIS2D and RS2 (Rocscience) to test advanced constitutive models and compare transverse settlement profiles; subsequently, a complete 3D FEM numerical model in RS3 (Rocscience) was used to simulate an Earth Pressure Balance (EPB) excavation sequence. The 3D numerical model simulates the relevant EPB components such as face pressure, TBM shield, backfilling of the tail void (time-dependent hardening of the grout) and gradual segmental lining erections in the longitudinal direction. The presented numerical approach can be used by tunnel designers and engineers to predict the soil response in EPBM tunnelling.

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A study on large volume losses induced by EBPM tunnelling in sandy soils

Cited by 10 publications

References 60 publications

Investigation on the Stress and Deformation Evolution Laws of Shield Tunnelling through a Mining Tunnel Structure

Investigation on the Stress and Deformation Evolution Laws of Shield Tunnelling through a Mining Tunnel Structure

Twin-tunnelling: Case studies in clay

Tunnelling with Full-Face Shielded Machines: A 3D Numerical Analysis of an Earth Pressure Balance (EPB) Excavation Sequence Using the Finite Element Method (FEM)

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