Probability analysis of shallow circular tunnels in homogeneous soil using the surface response methodology optimized by a genetic algorithm

Hamrouni, Adam; Dias, Daniel; Sbartai, Badreddine

doi:10.1016/j.tust.2019.01.008

Cited by 25 publications

(7 citation statements)

References 47 publications

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“…Actually, the theory of displacement earth pressure means that there is a close association between the earth pressure (i.e., the stress in soil) and the induced displacement during the movement of the retaining structure, which also involves the coupling process of external force, seepage action [27,28], soil microstructure damage [7,29], and even thermal loading [23,30]. In the existing theory, the relationship between displacement and earth pressure is generally described from three aspects: (a) the displacement earth pressure curve is fitted according to the experimental data to obtain a certain functional relationship between earth pressure and displacement [31]; (b) the association between the internal friction angle and the displacement is obtained from the backfilling of retaining structure, to obtain the variation of earth pressure with the corresponding displacement; (c) in view of the stress-strain constitutive law of the soil behind the retaining structure, the calculation model of the relationship between displacement and earth pressure is established.…”

Section: Displacement Earth Pressure Theorymentioning

confidence: 99%

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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Section: Displacement Earth Pressure Theorymentioning

confidence: 99%

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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“…To acquire a reliability index with a complex performance function or implicit state, some authors proposed the response surface method [27], which was initially mainly applied to the reliability analysis of slopes [28][29][30][31]. As research progressed, the response surface method has gradually been applied to reliability analysis in tunnel engineering [32]. In order to study the failure evolution of the tunnel in this paper, the surrounding rock of the tunnel is divided into nine parts.…”

Section: Introductionmentioning

confidence: 99%

Tunnel Failure Evolution and System Reliability Analysis Based on the β-unzipping Method

2021

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The structural failure of a tunnel is a process that evolves from local damage to overall destruction. The system reliability analysis method can be useful for analyzing the evolutionary law of local structural failure. In many complex stress environments, the structural performance function may be very complicated or even impossible to solve. This paper establishes a response surface function to represent the implicit tunnel performance function. The reliability of the shear capacity of a tunnel is considered. The critical parts and critical failure paths of the tunnel system are determined using the β-unzipping method. Failure evolution is analyzed to obtain the failure process of the tunnel system. Different failure modes are shown under different cases. Based on the partial failure probability and impact on the tunnel system, the risk levels of the critical parts at each stage of the failure history are evaluated. Therefore, the tunnel failure tree model obtained by combining the response surface method and β-unzipping method plays an important role in tunnel reliability evolution, and can evaluate tunnel safety comprehensively.

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“…For subway tunnel projects in sandy gravel strata [23][24][25], when discussing settlement control and deformation characteristics, the constitutive relationship of sandy gravel is rarely mentioned, and the commonly used Mohr-Coulomb relationship is still utilized [26]. e actual sandy gravel is a kind of coarse-grained soil; however, it is not reasonable to use the Mohr-Coulomb relationship.…”

Section: Introductionmentioning

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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Probability analysis of shallow circular tunnels in homogeneous soil using the surface response methodology optimized by a genetic algorithm

Cited by 25 publications

References 47 publications

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

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

Tunnel Failure Evolution and System Reliability Analysis Based on the β-unzipping Method

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

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