Tunnel Face Stability and the Effectiveness of Advance Drainage Measures in Water-Bearing Ground of Non-uniform Permeability

Zingg, Sara; Anagnostou, Georg

doi:10.1007/s00603-017-1312-1

Cited by 22 publications

(9 citation statements)

References 24 publications

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“…In equation (2.6), P w was generated by pore water pressure on the excavation face, where e i is the permeability coefficient of the i th-layer soil and z i is the thickness of the i th-layer soil [32,33].…”

Section: Theory and Research Methods For The Excavation Face Stabilitymentioning

confidence: 99%

Intelligent decision method for stability assessment of shield tunnel based on multi-objective data mining

Xue

et al. 2023

Phil. Trans. R. Soc. A.

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Due to improper operation of the shield construction process and unknown geological surveys, shield construction faces many risks in passing through complex strata, among which the excavation face instability is the most serious, potentially leading to disastrous accidents. To address these issues, this research focuses on the limit support pressure and the excavation face stability in the soil when crossing the Yangtze River. First, an analytical formula for the limit support pressure of the excavation face is established through the wedge model. The support safety coefficient is used to assess the excavation face stability quantitatively. Then the rough set algorithm is used to analyse the sensitivity of each index to establish the reduced evaluation index system for the excavation face stability. The back propagation (BP) neural network is used to train the learning data, and a neural network evaluation model with a prediction error of 5.7675 × 10 −4 is established. The prediction performance of BP is verified by comparison with the TOPSIS prediction model and the cloud model. The evaluation method proposed in this paper provides an essential reference for evaluating the underwater shield tunnel excavation face stability. This article is part of the theme issue ‘Artificial intelligence in failure analysis of transportation infrastructure and materials’.

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Section: Theory and Research Methods For The Excavation Face Stabilitymentioning

confidence: 99%

Intelligent decision method for stability assessment of shield tunnel based on multi-objective data mining

Xue

et al. 2023

Phil. Trans. R. Soc. A.

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“…Actually, the stress and deformation state changes of the surrounding stratum are very complicated during the shield tunnel excavation process [34,35], even related to the effect of environmental temperature [36,37] and the thermalmechanical behavior of tunnel lining segments [38,39]. For simplicity, this test simulates two extreme stress path change processes, namely, active failure and passive failure of the excavation surface.…”

Section: Test Schemesmentioning

confidence: 99%

A Constitutive Model of Sandy Gravel Soil under Large‐Sized Loading/Unloading Triaxial Tests

Zhang

Feng³

et al. 2021

Advances in Civil Engineering

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Based on large-scale triaxial tests of sandy gravel materials, the strength and deformation characteristics under loading/unloading conditions are analyzed. At the same time, the applicability of the hyperbolic constitutive model to sandy gravel is studied using experimental data. The results indicate that sandy gravel under low confining pressures (0.2 and 0.4 MPa) shows a weak softening trend; the higher the confining pressure, the more obvious the hardening tendency (0.6 and 0.8 MPa) and the greater the peak strength. During unloading tests, strain softening occurs, and the peak strength increases with increasing confining pressure. During loading tests, dilatancy appears when the confining pressure is low (0.2 MPa). With increasing confining pressure (0.4, 0.6, and 0.8 MPa), the dilatancy trend gradually weakens, and the cumulative volume tric strain increases, which reflects the relevance of the stress paths. Through research, it is found that the hyperbolic constitutive model has good applicability to sandy gravel soils, and the corresponding model parameters are obtained.

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“…In equation ( 23), the values of internal friction angles φ 0 and φ m and external friction angles δ 0 and δ m can be seen from equations (1) to (6), which are related to displacement ratio δ m ; other parameters are calculated as follows:…”

Section: Calculation Of Passive Support Force Of Excavationmentioning

confidence: 99%

“…Many theories have been made on the support force of the shield excavation surface, which have formed a variety of analysis methods such as the limit analysis method, and plastic balance theory, even considering the grouting reinforcement effect [3], drainage condition [4][5][6], migration of soil particles caused by infiltration [7,8], and consolidation deformation caused by temperature disturbance during excavation [9][10][11]. e upper limit value of the active limit earth pressure of the shield excavation surface was usually used to analyze the double logarithm spiral model.…”

Section: Introductionmentioning

confidence: 99%

“…e upper limit value of the active limit earth pressure of the shield excavation surface was usually used to analyze the double logarithm spiral model. Lee and Nam [12,13] obtained the upper limit value of the excavation surface's support force under the condition of groundwater seepage in view of the upper limit theorem while the infiltration problem and its effect become a hot topic [6,14]. Soubri and Wong [15] assume that the soil's sliding surface before the construction excavation surface can be considered as a given logarithmic spiral surface and studied the maximum support force by the limit analysis method.…”

Section: Introductionmentioning

confidence: 99%

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A Displacement‐Based Theory for Predicting the Support Force on the Shield Tunneling Surface in Sandy Soil Layers

Guang

Han

Zhang

et al. 2021

Advances in Civil Engineering

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Due to the poor stability of the loose sandy soil layer, if the support force is not properly controlled during the construction process of the shield tunnel using the earth pressure balance method, it is easy to cause the ground to collapse or uplift. Therefore, understanding the support force of the excavation surface of shield tunneling in sandy soil layer is very vital to ensure the stability of the excavation surface. Firstly, it is assumed that the damaged soil is a three-dimensional wedge and a modified three-dimensional wedge in the active and passive failure modes, respectively. The shallow soil pressure theory and the soil plastic limit equilibrium theory are derived by analyzing the stress distribution on the damaged soil. The equation for revealing the inner essence between the support force of the shield excavation surface and excavation surface displacement under the condition of sand-covered soil is used. Secondly, the numerical simulation method analyzes the displacement of the excavation surface when the support force changes under different working conditions, and the relationship curve between the excavation surface support force and the shield tunneling displacement is obtained. The comparison and analysis between the numerical simulation calculation and the theoretical analysis indicate that the deduced calculation equation for the excavation surface support force based on the displacement earth pressure is reasonable.

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Tunnel Face Stability and the Effectiveness of Advance Drainage Measures in Water-Bearing Ground of Non-uniform Permeability

Cited by 22 publications

References 24 publications

Intelligent decision method for stability assessment of shield tunnel based on multi-objective data mining

Intelligent decision method for stability assessment of shield tunnel based on multi-objective data mining

A Constitutive Model of Sandy Gravel Soil under Large‐Sized Loading/Unloading Triaxial Tests

A Displacement‐Based Theory for Predicting the Support Force on the Shield Tunneling Surface in Sandy Soil Layers

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