State of the art in evaluation and interpretation of displacement monitoring data in tunnels / Stand der Auswertung und Interpretation von Verschiebungsmessdaten bei Tunneln

Schubert, Wulf; Moritz, Bernd

doi:10.1002/geot.201100033

Cited by 9 publications

(1 citation statement)

References 4 publications

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“…Even if it is not always possible to carry out sophisticated back-analyses during construction, further analyses aimed at better understanding the rock mass behaviour and the lining response could lead to improved geotechnical and structural design for construction works under similar conditions. A significant number of publications dealing with the interpretation of lining displacement and prediction of rock mass behaviour are already available [1] [2]. Attempts aimed at interpreting and determining stresses or pressures recorded directly on the shotcrete lining are however limited [3].…”

Section: Introductionmentioning

confidence: 99%

Verification of a rheological constitutive model for shotcrete through back‐analysis

Paternesi

Schweiger

Schubert

2016

Geomechanics and Tunnelling

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Tunnel excavation represents a particularly challenging problem from the design point of view, mainly due to the uncertainties characterising the soil or rock mass behaviour and to the difficulties in the prediction of the stress state on the structural supports. This explains why tunnel designers mostly rely on observational data, adapting excavation sequences and support measures during the construction phase (at least in the case of traditionally excavated tunnels), especially for deep tunnels, where the geological and geotechnical uncertainties can be significant. However, the observational method requires a reliable monitoring system as well as considerable work to interpret and back-analyse data measured during construction. On the other hand, this interpretation and back-analysis represent an important step in gaining better understanding of the system response and allowing improvement of the design, thus avoiding excessively conservative and uneconomical solutions. In this paper, a back-analysis of stress and displacement measurements is presented for a NATM tunnel excavation in rock, carried out using a rheological model for shotcrete. It is shown, consistently with the previous literature on the topic, that the use of an advanced model improves the prediction of tunnel behaviour compared to the common practice of using quasi-elastic E-moduli.

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Section: Introductionmentioning

confidence: 99%

Verification of a rheological constitutive model for shotcrete through back‐analysis

Paternesi

Schweiger

Schubert

2016

Geomechanics and Tunnelling

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Hybrid methods for shotcrete and segmental linings tunnel shells – Combining displacement and rotation measurements with computational multiscale mechanics

Pichler

Hellmich

2018

Geomechanics and Tunnelling

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This contribution highlights recent developments in the analysis and monitoring of tunnel linings based on so‐called hybrid methods. In this context, the word ”hybrid“ refers to a suitable combination of measurement data from geotechnical monitoring, with advanced simulation tools of engineering mechanics. The first part of this contribution refers to the New Austrian Tunneling Method (NATM), where monitoring during construction includes daily measurements of the 3D displacement vectors of ”measurement points“ installed in ”measurement cross‐sections“. Shell theory‐informed spatial and temporal interpolation of the displacements between the aforementioned ”grid points“, allows for reconstructing the evolution of the displacement and strain fields throughout the tunnel shell. Feeding these fields into realistic thermo‐chemo‐mechanical, potentially multiscale, models for the chemically hardening and creeping shotcrete, allows for the determination of the lining stresses over time. The latter give access to corresponding safety indicators or utilization degrees considering the evolving strength of shotcrete; and they also allow for quantifying the traction forces acting from the rock mass, on the exterior boundary of the tunnel lining. The second part of this contribution refers to the first steps towards the hybrid analysis of segmental lining, as installed in mechanized tunnelling. Relative rotation angles, as measured, in the course of a full‐scale test, in the joints between adjacent segments of a segmental ring, are prescribed on a structural mechanics model based on analytical solutions from circular arch theory.

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Tunnelbau

Prinz¹,

Strauß²

2018

Ingenieurgeologie

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State of the art in evaluation and interpretation of displacement monitoring data in tunnels / Stand der Auswertung und Interpretation von Verschiebungsmessdaten bei Tunneln

Cited by 9 publications

References 4 publications

Verification of a rheological constitutive model for shotcrete through back‐analysis

Verification of a rheological constitutive model for shotcrete through back‐analysis

Hybrid methods for shotcrete and segmental linings tunnel shells – Combining displacement and rotation measurements with computational multiscale mechanics

Tunnelbau

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