Spatial Effects in Tunnelling Through Squeezing Ground: Diss. (Veröffentlichungen des Instituts für Geotechnik (IGT) der ETH Zürich)
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Beschreibung
Large and long-lasting deformations in the tunnel circumference are a major difficulty when tunnelling through weak rock (“squeezing ground”). The “genuine rock pressure” may destroy the tunnel lining or necessitate costly reshaping work. During excavation, various processes are superimposed on one another in the vicinity of the face, including stress redistribution, consolidation proresponsible for the triggering of deformations and – if an attempt is made to halt the deformations – for the accumulation of rock pressure on the lining. The technical literature includes many studies into the key issue of squeezing ground. The interaction between tunnel lining and squeezing ground is usually analysed on the basis of the plane strain model. However, this model cannot handle spatial effects in the vicinity of the face. In the past three-dimensional numerical analyses were carried out mainly in order to develop a plane strain theory for the analysis of spatial problems, as well as to solve project-specific problems with no general validity. There are very few fundamental investigations into the effects of spatial stress redistribution on interactions in the vicinity of the face. The present dissertation takes this as its starting point: Mr Cantieni has analysed these poorlyunderstood spatial effects and has worked out their impact on support measures, both in qualitative and quantitative terms.
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