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Statements

Subject Item
n2:RIV%2F00216208%3A11310%2F11%3A10107481%21RIV12-GA0-11310___
rdf:type
n17:Vysledek skos:Concept
dcterms:description
The 2D load-reduction method for simulating NATM tunnels using plane strain finite elements is evaluated in the paper by comparison with fully 3D simulations. Three real shallow tunnels in urban environment in different stiff clays were simulated. The soil behaviour was described by an advanced non-linear soil constitutive model based on the hypoplasticity theory. Time-dependent behaviour of shotcrete lining was considered in 3D simulations, whereas constant final stiffness was used in the plane strain analyses. The 2D analyses were thus controlled by a single parameter that accounts for 3D effects. It is shown that for an optimum value of this parameter, the displacement field predicted by the 2D method agrees well with the 3D simulations. In some cases only, a discrepancy was observed in the close vicinity of the tunnel. The controlling parameter was, however, found to be dependent on the problem simulated (for the same material) and also on the material properties (for the same tunnelling problem). Considering the material properties, the shear modulus at very small strain was found to be more influential than the shear modulus at large strain. The initial K0 stress state did not influence the controlling parameter substantially. The 2D load-reduction method for simulating NATM tunnels using plane strain finite elements is evaluated in the paper by comparison with fully 3D simulations. Three real shallow tunnels in urban environment in different stiff clays were simulated. The soil behaviour was described by an advanced non-linear soil constitutive model based on the hypoplasticity theory. Time-dependent behaviour of shotcrete lining was considered in 3D simulations, whereas constant final stiffness was used in the plane strain analyses. The 2D analyses were thus controlled by a single parameter that accounts for 3D effects. It is shown that for an optimum value of this parameter, the displacement field predicted by the 2D method agrees well with the 3D simulations. In some cases only, a discrepancy was observed in the close vicinity of the tunnel. The controlling parameter was, however, found to be dependent on the problem simulated (for the same material) and also on the material properties (for the same tunnelling problem). Considering the material properties, the shear modulus at very small strain was found to be more influential than the shear modulus at large strain. The initial K0 stress state did not influence the controlling parameter substantially.
dcterms:title
Comparison of displacement field predicted by 2D and 3D finite element modelling of shallow NATM tunnels in clays Comparison of displacement field predicted by 2D and 3D finite element modelling of shallow NATM tunnels in clays
skos:prefLabel
Comparison of displacement field predicted by 2D and 3D finite element modelling of shallow NATM tunnels in clays Comparison of displacement field predicted by 2D and 3D finite element modelling of shallow NATM tunnels in clays
skos:notation
RIV/00216208:11310/11:10107481!RIV12-GA0-11310___
n17:predkladatel
n18:orjk%3A11310
n3:aktivita
n9:S n9:P n9:Z
n3:aktivity
P(GA205/08/0732), P(GAP105/11/1884), S, Z(MSM0021620855)
n3:cisloPeriodika
2
n3:dodaniDat
n5:2012
n3:domaciTvurceVysledku
n12:2814161 n12:6661025
n3:druhVysledku
n13:J
n3:duvernostUdaju
n14:S
n3:entitaPredkladatele
n21:predkladatel
n3:idSjednocenehoVysledku
191107
n3:idVysledku
RIV/00216208:11310/11:10107481
n3:jazykVysledku
n4:eng
n3:klicovaSlova
Three dimensional computer graphics; Materials properties; Geologic models; Finite element method; Elastic moduli
n3:klicoveSlovo
n6:Geologic%20models n6:Materials%20properties n6:Finite%20element%20method n6:Three%20dimensional%20computer%20graphics n6:Elastic%20moduli
n3:kodStatuVydavatele
DE - Spolková republika Německo
n3:kontrolniKodProRIV
[CEF6CCAF83BD]
n3:nazevZdroje
Geotechnik
n3:obor
n16:JM
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
2
n3:projekt
n10:GAP105%2F11%2F1884 n10:GA205%2F08%2F0732
n3:rokUplatneniVysledku
n5:2011
n3:svazekPeriodika
34
n3:tvurceVysledku
Svoboda, Tomáš Mašín, David
n3:zamer
n19:MSM0021620855
s:issn
0172-6145
s:numberOfPages
12
n20:doi
10.1002/gete.201000009
n15:organizacniJednotka
11310