Interpretation of displacement monitoring data for tunnels in heterogeneous rock masses

Schubert, Wulf; Grossauer, Karl; Button, Edward Alan

doi:10.1016/j.ijrmms.2004.03.152

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…During tunnel manufacturing, measurements must observe and monitor deformations to control projects' adequacy [29][30][31][32]. It includes observation instrumentation, according to Peck [33].…”

Section: Measurements During Tunnel Excavationmentioning

confidence: 99%

Discontinuity Controlled Deformation Estimation in small Diameter Tunnels

Ural¹,

GUNCELLEYİNİZ²,

Poşluk³

2022

El-Cezeri Fen Ve Mühendislik Dergisi

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Tunnel projects are carried out in tunnel construction by evaluating the soil and rock profiles obtained from the exploration drillings along the route, groundwater level, and structural elements. In practice, there are some differences between the geological sections foreseen according to the exploration drillings and the structural elements encountered during tunnel construction. This study has modeled a tunnel, through intermediate to weak and very weak rocks, between Ankara and Istanbul, obtained the deformation amounts by numerical analysis. To get the principal stresses, deformation forces, and surface settlements on the tunnel lining in each excavator were used Phase2D. The total displacement amounts were calculated with the numerical analysis. After, during tunnel manufacturing, were measurement deformations to control projects' adequacy. Thus, the results of the analysis and deformation amounts encountered during the tunnel between Ankara and Istanbul opened were compared. At the end of the study, when the discontinuity properties are taken into account in the calculation, it was seen that the deformations obtained and the deformations obtained from the numerical analysis gave very close values. As a result, it was concluded that discontinuity data that was not seen at the project stage for cost-effective tunnel design in tunnels should be collected and added to the analysis as much as possible. It was concluded that corrections should be made in the support system during the manufacturing studies with the back analysis method.

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Section: Measurements During Tunnel Excavationmentioning

confidence: 99%

Discontinuity Controlled Deformation Estimation in small Diameter Tunnels

Ural¹,

GUNCELLEYİNİZ²,

Poşluk³

2022

El-Cezeri Fen Ve Mühendislik Dergisi

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“…Schubert et al (2004) found that the displacement monitoring data could reveal the expected rock mass quality ahead of an advancing tunnel face using the displacement vector orientation.…”

Section: Literature Reviewmentioning

confidence: 99%

Prediction of Ground Conditions Ahead of an Advancing Tunnel Face by Quantification of Vector Orientation

Goswami

Sharma

2014

Tunneling and Underground Construction

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Observation and Measurement of displacements at the crown of the tunnel is an integral part of NATM (New Austrian Tunneling Method) in complex rock masses to verify the construction parameters, support systems and safety requirements. However, the prediction of ground conditions ahead of an advancing tunnel face is also an application, often explored less in the field by site engineers. Literature suggests displacement vector orientation as a good indicator of weak ground or fault/shear zones ahead of the tunnel face. There has been no quantification between the vector orientation and the properties of the weaker ground ahead. An attempt is made to quantify the effect of the properties of the weaker ground on the vector orientation numerically. The model results are initially compared with analytical solutions, followed by benchmarking with the results of other researchers. The factors which affect the vector orientation are the diameter of the tunnel, stiffness ratio of the rocks and insitu stress ratio. The effect of each of these parameters is studied independently. A correlation between the vector orientation and the variation in ground conditions is then established to predict the properties of the weaker ground ahead of the advancing tunnel face.

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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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Interpretation of displacement monitoring data for tunnels in heterogeneous rock masses

Cited by 6 publications

References 6 publications

Discontinuity Controlled Deformation Estimation in small Diameter Tunnels

Discontinuity Controlled Deformation Estimation in small Diameter Tunnels

Prediction of Ground Conditions Ahead of an Advancing Tunnel Face by Quantification of Vector Orientation

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

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