Three-Dimensional Nonlinear Analyses of a Metro Tunnel in São Paulo Porous Clay, Brazil

Sousa, J. Almeida e; Negro, Aurelio; Fernandes, Manuel Matos; Cardoso, António Silva

doi:10.1061/(asce)gt.1943-5606.0000433

Cited by 32 publications

(4 citation statements)

References 4 publications

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“…(3) The ground subsidence increased with the increase of depth, but the measured ground surface settlement exceeded the arch settlement. Other case histories report similar result all referred it to porous soft contracting clayey soils of tropical origin (Negro, 1998;Almeida e Sousa et al, 2011). However, this result in the present case seem to result from the time lag of monitoring in the tunnel, since the value accounted for about 20-30% of the final arch settlement was taken place before the arriving of tunnel face and was unable to be measured.…”

Section: Deep Displacement Characteristicscontrasting

confidence: 77%

Displacement characteristics of high-speed railway tunnel construction in loess ground by using multi-step excavation method

Zhao²,

Zhou

2016

Tunnelling and Underground Space Technology

133

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Section: Deep Displacement Characteristicscontrasting

confidence: 77%

Displacement characteristics of high-speed railway tunnel construction in loess ground by using multi-step excavation method

Zhao²,

Zhou

2016

Tunnelling and Underground Space Technology

133

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“…At present, there are various theoretical, empirical and numerical calculation methods used in the calculation of the stresses of loose rock surrounding shallow tunnels. These methods each have their own characteristics and applicability in calculations [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Statistical Characteristics of Stress Changes in Tunnel Surrounding Rock Based on Random Discrete Variability of Geotechnical Materials

Jiang,

Yang,

Chen

et al. 2023

Applied Sciences

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In the construction of underground engineering, the determination of surrounding rock stresses has important theoretical significance for the design of tunnel structure reliability. In this paper, the nonlinear criterion is introduced to modify and improve the friction resistance in the calculation formula of Bierbaumer’s loose surrounding rock stresses, and the improved application is carried out in view of the situation of composite formation. Due to the variability and discreteness of geotechnical parameters, combined with engineering examples, Monte Carlo random sampling is carried out for various geotechnical parameters in engineering, and the characteristics of loose surrounding rock stresses are analyzed from the perspective of statistical reliability by using the improved shallow tunnel formula. By using the standard regression coefficient, the weight influence of the parameters in various shallow surrounding rock stress formulas is analyzed, and the confidence degree of the calculated results of various formulas is analyzed from a statistical point of view, which verifies the rationality of the improved formula in the statistical sense.

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“…With the advantages of safe, reliable, and environmental preservation [1,2], the tunnel boring machine (TBM) has been increasingly used in long tunnels operations [3][4][5] and hydraulic pipelines construction [6,7]. However, it encounters a lot of problems in face of a full-face hard rock tunnel, such as low digging efficiency, high disc cutter wear rate, and the machine getting stuck [8,9].…”

Section: Introductionmentioning

confidence: 99%

Rock Breaking Performance of TBM Disc Cutter Assisted by High-Pressure Water Jet

Wang

Zhou

et al. 2020

Applied Sciences

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A high-pressure water jet can break rock efficiently, which is of great potential to overcome the problems of a tunnel boring machine (TBM) in full-face hard rock tunnel digging, such as low digging efficiency and high disc cutter wear rate. Therefore, this paper presented a new tunneling method that is a TBM coupled with a high-pressure water jet. The rock failure mechanism under the coupled forces of a disc cutter and water jet was analyzed at first. Then, the finite element method (FEM) and smoothed particle hydrodynamics (SPH) method were used to establish a numerical model of rock broken by the disc cutter and water jet. Effects of parameters on rock breaking performance were studied based on the numerical model. Moreover, an experiment of the water jet cutting marble was carried out to verify the reliability of the numerical simulation. Results showed that the high-pressure water jet can increase the TBM digging efficiency and decrease the forces and wear rate of the disc cutter. The optimum nozzle diameter is 1.5 mm, while the optimum jet velocity is 224.5 m/s in this simulation. The results can provide theoretical guidance and data support for designing the most efficient system of a TBM with a water jet for digging a full-face hard rock tunnel.

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Three-Dimensional Nonlinear Analyses of a Metro Tunnel in São Paulo Porous Clay, Brazil

Cited by 32 publications

References 4 publications

Displacement characteristics of high-speed railway tunnel construction in loess ground by using multi-step excavation method

Displacement characteristics of high-speed railway tunnel construction in loess ground by using multi-step excavation method

Statistical Characteristics of Stress Changes in Tunnel Surrounding Rock Based on Random Discrete Variability of Geotechnical Materials

Rock Breaking Performance of TBM Disc Cutter Assisted by High-Pressure Water Jet

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