Computational Simulation of Mechanized Tunneling as Part of an Integrated Decision Support Platform

Meschke, Günther; Nagel, Felix; Stascheit, Janosch

doi:10.1061/(asce)gm.1943-5622.0000044

Cited by 34 publications

(10 citation statements)

References 17 publications

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“…The model is characterized by a realistic consideration of the construction process in mechanized tunneling accounting for all relevant components and their interactions. More details of the numerical model ekate can be found in (Meschke et al 2011). The appropriateness of using this model to represent the behavior of tunnels and the surrounding soil has been verified with monitoring data from real tunnel projects, see e.g.…”

Section: Numerical Simulation In Mechanized Tunnelingmentioning

confidence: 99%

Numerical Predictions of Surface Settlements in Mechanized Tunneling: Hybrid POD and ANN Surrogate Modeling for Reliability Analyses

Freitag¹,

Cao²,

Meschke³

2014

Vulnerability, Uncertainty, and Risk

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Computational reliability analyses of engineering structures are often time consuming, in particular, if time-dependent structural behavior is considered. If (almost) real time prognoses are required, surrogate models may be used to approximate the structural behavior described by advanced numerical models. In this paper, a hybrid surrogate modeling strategy based on a combination of Proper Orthogonal Decomposition (POD) and Artificial Neural Networks (ANN) is introduced. The hybrid approach is developed for the approximation of time variant surface settlements in mechanized tunneling due to uncertain geological and process parameters. The approximation capabilities are demonstrated by means of an example. The new hybrid surrogate model can be applied for numerical efficient real time reliability analyses in mechanized tunneling.

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Section: Numerical Simulation In Mechanized Tunnelingmentioning

confidence: 99%

Numerical Predictions of Surface Settlements in Mechanized Tunneling: Hybrid POD and ANN Surrogate Modeling for Reliability Analyses

Freitag¹,

Cao²,

Meschke³

2014

Vulnerability, Uncertainty, and Risk

Self Cite

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“…A processoriented model for mechanized tunnelling in soft soils along arbitrary (curved) alignments has been de veloped within the framework of the objectoriented finite element code "Kratos" [7]. In this model, all relevant com pending on the desired degree of level of detail, the tunnel lining is modelled in a continuous model, accounting for segmentation by means of a homogenized stiffness reduc tion, or by explicitly considering segmentation of the tun nel linings by contact conditions along ring and longitudi nal joints during the installation process ( Figure 3).…”

Section: Loadings Acting On Tunnel Linings During Mechanized Tunnellimentioning

confidence: 99%

“…The conical shield skin interacts with the excavated soil by means of frictional (surface to sur face) contact conditions. No input data on volume loss is required [7], as this is an output of the model. The TBM is advanced by 1D elements representing the hydraulic jacks.…”

Section: Loadings Acting On Tunnel Linings During Mechanized Tunnellimentioning

confidence: 99%

Robust segmental lining design – Potentials of advanced numerical simulations for the design of TBM driven tunnels

Meschke

Neu

Marwan

2019

Geomechanics and Tunnelling

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Loading assumptions used for the structural design of segmental linings often improperly reflect the complex load combinations that develop during the construction of a bored tunnel. Therefore segment designs used in practice tend to be on the safe side and often rely on conventional reinforcement methods instead of including other reinforcement concepts, such as steel fibres. In this contribution, a multi‐scale computational modelling framework is proposed to investigate the response of steel‐fibre reinforced, traditionally reinforced, and hybrid‐reinforced lining segments to radial loadings with an emphasis on the longitudinal joints. This modelling approach offers an opportunity to directly investigate the influence of type and content of steel fibres on the performance of segmented linings at the structural scale. Using this framework, a method for robust optimization is applied in order to generate damage‐tolerant hybrid segment designs.

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“…To this end, a numerical simulation of the construction process of the tunnel by means of a tunnel boring machine (TBM) advancing symmetrically underneath a building with pile foundation is performed. For the analysis of tunnel advance, a process-oriented FE model developed for mechanized tunneling [45] is employed. This model includes all relevant components of the mechanized tunneling process (partially or fully saturated ground, the TBM, the tunnel lining, hydraulic thrust jacks, and the tail void grouting) as submodels, as well as their mutual interactions.…”

Section: Shield Tunneling Underneath a High-rise Building On Pile Foumentioning

confidence: 99%

Beam–solid contact formulation for finite element analysis of pile–soil interaction with arbitrary discretization

Ninić

Stascheit

Meschke

2014

Num Anal Meth Geomechanics

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This paper presents an embedded beam formulation for discretization independent finite element (FE) analyses of interactions between pile foundations or rock anchors and the surrounding soil in geotechnical and tunneling engineering. Piles are represented by means of finite beam elements embedded within FEs for the soil represented by 3D solid elements. The proposed formulation allows consideration of piles and pile groups with arbitrary orientation independently from the FE discretization of the surrounding soil. The interface behavior between piles and the surrounding soil is represented numerically by means of a contact formulation considering skin friction as well as pile tip resistance. The pile-soil interaction along the pile skin is considered by means of a 3D frictional point-to-point contact formulation using the integration points of the beam elements and reference points arbitrarily located within the solid elements as control points. The ability of the proposed embedded pile model to represent groups of piles objected to combined axial and shear loading and their interactions with the surrounding soil is demonstrated by selected benchmark examples. The pile model is applied to the numerical simulation of shield driven tunnel construction in the vicinity of an existing building resting upon pile foundation to demonstrate the performance of the proposed model in complex simulation environments. J. NINIĆ, J. STASCHEIT AND G. MESCHKE analytical models consider the pile-soil interaction problem by means of an elastically bedded Winkler beam, also known as the p-y approach. In this method, one-dimensional springs are used to describe the 3D soil-pile interaction effects [13][14][15]. Later, this approach was modified to account for plastic deformations of the soil by incorporating nonlinearity in the soil springs [16][17][18][19][20]. In geotechnical engineering, the p-y method has been extensively used in the analysis and the design of piles. Because of rich experimental data used to derive the shape of the p-y curves, this approach has been found effective for many practical applications. Poulos (1973) proposed another analytical, displacementbased method, to analyze the lateral pile response. In this method, a free-field soil movement profile is imposed on a pile in a simplified boundary element analysis to estimate the pile response [21]. Using such an analysis method associated with laboratory testing of piles and pile groups, a series of design charts and theoretical expressions have been developed for estimating the pile response for slope stabilization, excavation, and tunneling operations [2,9,22,23].Evidently, analytical models are based upon more or less significant simplifications of the mechanisms involved in the 3D pile-soil interaction and the interactions between soil strata.Finite element (FE) models have a comparably larger potential to realistically describe material nonlinearities, different loading cases and complex geological environments in analyses of soil-pile interaction. An early ...

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Computational Simulation of Mechanized Tunneling as Part of an Integrated Decision Support Platform

Cited by 34 publications

References 17 publications

Numerical Predictions of Surface Settlements in Mechanized Tunneling: Hybrid POD and ANN Surrogate Modeling for Reliability Analyses

Numerical Predictions of Surface Settlements in Mechanized Tunneling: Hybrid POD and ANN Surrogate Modeling for Reliability Analyses

Robust segmental lining design – Potentials of advanced numerical simulations for the design of TBM driven tunnels

Beam–solid contact formulation for finite element analysis of pile–soil interaction with arbitrary discretization

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