On the importance of advanced constitutive models in finite element simulations of deep tunnel advance

Schreter, Magdalena; Neuner, Matthias; Unteregger, D.; Hofstetter, Günter

doi:10.1016/j.tust.2018.06.008

Cited by 17 publications

(11 citation statements)

References 36 publications

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“…It is concluded that localization of deformation is obtained in the longitudinal direction while in perpendicular planes the displacement distribution is smooth. This is in contrast to the previous 2D simulations [4] of a single cross section, where localization of deformation into distinct shear bands in the plane perpendicular to the tunnel axis was predicted.…”

Section: Displacementscontrasting

confidence: 99%

“…To trigger the damage-induced strain localization in the rock mass, non-uniformly distributed rock mass properties are assumed by introducing zones in which the strength of the rock mass is slightly weakened (indicated by light-brown areas in Figure 1(b)). It was verified that these weakened zones do not affect the predicted mechanical response prior to the onset of strain softening in the rock mass [4].…”

Section: D Finite Element Model Of Deep Tunnelingmentioning

confidence: 85%

“…The parameters for intact rock of Innsbruck quartz phyllite for the Hoek-Brown model and for the gradient-enhanced RDP model were determined from a best fit with the experimental results of triaxial compression tests on Innsbruck quartz phyllite specimens [4,13]. For calculating the empirical reduction factors for the transition from intact rock to rock mass, the geological strength index GS I and the disturbance factor D were specified according to the geological survey as 50 and 0, respectively.…”

Section: Materials Parameters Of Innsbruckmentioning

confidence: 99%

“…Thus, aiming at an adequate representation of the nonlinear stress-strain behavior of rock in the pre-peak and the post-peak regime of the stress-strain relation, an isotropic rock damage-plasticity (RDP) model was proposed in [2], extended by a gradient-enhanced damage formulation in [3]. The performance of the RDP model was assessed in [4] based on simplified two-dimensional finite element simulations of deep NATM tunneling. Therein, softening in the rock mass manifested in localization of deformation into narrow zones of distinct shear bands in the vicinity of the tunnel.…”

Section: Introductionmentioning

confidence: 99%

“…For this purpose, a large-scale three-dimensional finite element model is developed, derived from a stretch of the Brenner Base Tunnel constructed by the NATM in Innsbruck quartz phyllite rock mass. In contrast to the previous twodimensional study [4], the influence of threedimensional effects can be assessed and the real drill, blast and secure construction process is modeled in a natural way. Nevertheless, such a large-scale simulation poses a demanding computational effort.…”

Section: Introductionmentioning

confidence: 99%

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Influence of softening rock mass behavior in 3D simulations of deep tunneling

Schreter¹

2019

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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The present contribution is concerned with finite element modeling of NATM tunneling with special emphasis on adequately modeling the highly nonlinear mechanical behavior of rock mass up to failure. Based on a numerical study of deep tunneling, derived from a stretch of the Brenner Base Tunnel, the mechanical behavior predicted by the novel gradient-enhanced rock damage-plasticity model will be assessed in large-scale, three-dimensional finite element simulations and compared with the one on the basis of a commonly employed linear elastic-perfectly plastic rock model. A significant difference in the mechanical response of the tunnel structure is obtained: employing the rock damage-plasticity model reveals a substantial increase of the displacements in the vicinity of the tunnel due to softening rock mass behavior. Consequently, higher loads are imposed onto the tunnel support, increasing the required load-bearing capacity.

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Section: Displacementscontrasting

confidence: 99%

Section: D Finite Element Model Of Deep Tunnelingmentioning

confidence: 85%

Section: Materials Parameters Of Innsbruckmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of softening rock mass behavior in 3D simulations of deep tunneling

Schreter¹

2019

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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Wechselwirkungen zwischen tiefliegendem Tunnelvortrieb und bestehendem Tunnel im Bereich von Störzonen – Modellierung versus Realität

Cordes¹,

Weifner²,

Unteregger³

et al. 2019

Geomechanics and Tunnelling

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The influence of a tunnel drive on an existing tunnel is primarily the result of the tunnel geometries, the relative location of the two tunnels, the geological‐geomechanical conditions and the associated primary stress state. During construction of the Brenner Base Tunnel, there are constructionally relevant interactions in some places between the running tunnels and the exploratory tunnel (EKS) running centrally and 12 m deeper. The rock mass stress as a result of driving the running tunnels here leads to deformations of the previously driven exploratory tunnel. Due to the high loading on the outer linings of deep tunnels and the high stiffness of the already hardened shotcrete support, slight deformation can cause local cracking in the support layer. This article compares the observed deformations in a fault zone intersecting at a flat angle with numerical simulations, which enables investigation of the geomechanical problems. Comparison of the calculation results with the real deformation behaviour permits the validation of the numerical simulations and the reliability and limits of such analyses.

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Creep characteristics and fractional rheological model of granite under temperature and disturbance load coupling

2023

Mech Time-Depend Mater

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On the importance of advanced constitutive models in finite element simulations of deep tunnel advance

Cited by 17 publications

References 36 publications

Influence of softening rock mass behavior in 3D simulations of deep tunneling

Influence of softening rock mass behavior in 3D simulations of deep tunneling

Wechselwirkungen zwischen tiefliegendem Tunnelvortrieb und bestehendem Tunnel im Bereich von Störzonen – Modellierung versus Realität

Creep characteristics and fractional rheological model of granite under temperature and disturbance load coupling

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