Post on 19-Oct-2020
. EUROPEAN SLAB TRACK SYMPOSIUM 2005 [ www.ifv-bahntechnik.de/euro-info ] 1
Behaviour of slab track under
extreme stress conditions
European
Slab Track
Symposium Bruxelles
22 February 2005
Behaviour of slab track
under extreme stress conditions
Dr.-Ing. Lutz VogtPD Dr.-Ing. Peter-Andreas von WolffersdorffDr.-Ing. Erich Rehfeld
phone: +49 (0) 351 824 13 50http://www.baugrund-dresden.deinfo@baugrund-dresden.de
European Slab Track Symposium, Bruxelles, 22. February 2005 13:25 - 13:50
. EUROPEAN SLAB TRACK SYMPOSIUM 2005 [ www.ifv-bahntechnik.de/euro-info ] 2
Behaviour of slab track under
extreme stress conditions
European
Slab Track
Symposium Bruxelles
22 February 2005
Proposed advantages of slab track
for high-speed railways
� Durability
� Low maintenance costs
� Economical selection of route elements
. EUROPEAN SLAB TRACK SYMPOSIUM 2005 [ www.ifv-bahntechnik.de/euro-info ] 3
Behaviour of slab track under
extreme stress conditions
European
Slab Track
Symposium Bruxelles
22 February 2005
Slab track development in Germany
accompanied by BAUGRUND DRESDEN
� Slab track field test (e.g. Breddin-Glöwen, Waghäusel,
Eckartshausen)
� High-speed line from Hannover to Berlin
� High-speed line from Cologne to Frankfurt/Main
� High-speed line from Nuremberg to Ingolstadt
. EUROPEAN SLAB TRACK SYMPOSIUM 2005 [ www.ifv-bahntechnik.de/euro-info ] 4
Behaviour of slab track under
extreme stress conditions
European
Slab Track
Symposium Bruxelles
22 February 2005
Influences on the load-bearing
behaviour of slab track
� Dynamic axle loads, depending on static axle loads, train velocity, vehicle and track component quality,
properties of the substructure
� Temperature effects
� Cyclic behaviour of slab and substructure
� Building process
. EUROPEAN SLAB TRACK SYMPOSIUM 2005 [ www.ifv-bahntechnik.de/euro-info ] 5
Behaviour of slab track under
extreme stress conditions
European
Slab Track
Symposium Bruxelles
22 February 2005
Characteristics of the standard calculation
method for slab tracks in Germany
� Design leads to safe tracks and durable slab structure
under standard stress conditions
� Determination of behavioural reserves of slab track
under standard stress conditions is not possible
� Determination of the behaviour of slab track under
extreme stress conditions is not possible
� Simplified approach to the underground reaction, the
dynamical behaviour and the interaction between the
layers of the slab structure
. EUROPEAN SLAB TRACK SYMPOSIUM 2005 [ www.ifv-bahntechnik.de/euro-info ] 6
Behaviour of slab track under
extreme stress conditions
European
Slab Track
Symposium Bruxelles
22 February 2005
Model aspects of the load-bearing
behaviour of slab track
� Splitting temperature and axle loads
� Safety factors for loads (UIC) and material properties
� Simplified approach to the mechanical model concerning
interval and width of cracks
� Substructure model as ground reaction
. EUROPEAN SLAB TRACK SYMPOSIUM 2005 [ www.ifv-bahntechnik.de/euro-info ] 7
Behaviour of slab track under
extreme stress conditions
European
Slab Track
Symposium Bruxelles
22 February 2005
� No failure but suggested reduction of serviceability and
shortening of life cycle
� Many influence factors and the time dependent
behaviour of slab track make general approaches very
difficult
� Work on special parts and calibrate the calculations with
test results, observations and measurements
Model aspects of the load-bearing
behaviour of slab track
. EUROPEAN SLAB TRACK SYMPOSIUM 2005 [ www.ifv-bahntechnik.de/euro-info ] 8
Behaviour of slab track under
extreme stress conditions
European
Slab Track
Symposium Bruxelles
22 February 2005
0,00
2,00
4,00
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s [m
m]
2001 2002 2003 2004
Time depending settlement at so called white dam (high speed line from Colongne to Frankfurt/Main, km 121,841-122,070)
se
ttle
me
nt[m
m]
prediction/fitting
. EUROPEAN SLAB TRACK SYMPOSIUM 2005 [ www.ifv-bahntechnik.de/euro-info ] 9
Behaviour of slab track under
extreme stress conditions
European
Slab Track
Symposium Bruxelles
22 February 2005
0
10
20
30
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60
0 50 100 150 200 250
distance [m]
se
ttle
me
nt[m
m]
Settlement under the rail at so called white dam (high speed line from Colongne to Frankfurt/Main, km 121,841-122,070)
. EUROPEAN SLAB TRACK SYMPOSIUM 2005 [ www.ifv-bahntechnik.de/euro-info ] 10
Behaviour of slab track under
extreme stress conditions
European
Slab Track
Symposium Bruxelles
22 February 2005
Dam with extreme settlement (high speed line from Colongne to Frankfurt/Main, km 72,602-72,692)
. EUROPEAN SLAB TRACK SYMPOSIUM 2005 [ www.ifv-bahntechnik.de/euro-info ] 11
Behaviour of slab track under
extreme stress conditions
European
Slab Track
Symposium Bruxelles
22 February 2005
0
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Settlement till February 2004 (high speed line from Colongne to Frankfurt/Main, km 72,602-72,692)
distance [m]
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ttle
me
nt [m
m]
. EUROPEAN SLAB TRACK SYMPOSIUM 2005 [ www.ifv-bahntechnik.de/euro-info ] 12
Behaviour of slab track under
extreme stress conditions
European
Slab Track
Symposium Bruxelles
22 February 2005
Slab track without visible defects (high speed line from Colongne to Frankfurt/Main, km 72,602-72,692)
. EUROPEAN SLAB TRACK SYMPOSIUM 2005 [ www.ifv-bahntechnik.de/euro-info ] 13
Behaviour of slab track under
extreme stress conditions
European
Slab Track
Symposium Bruxelles
22 February 2005
area of settlement
maximum settlemen: 18 mm
northern rail
Settlements at high speed line from Hannover to Berlin, Dallgow
. EUROPEAN SLAB TRACK SYMPOSIUM 2005 [ www.ifv-bahntechnik.de/euro-info ] 14
Behaviour of slab track under
extreme stress conditions
European
Slab Track
Symposium Bruxelles
22 February 2005
Cracks in the slab structure at high speed line from Hannover to Berlin, Dallgow
shallow crack
in the concrete slab
open cracks
Dg, 11
. EUROPEAN SLAB TRACK SYMPOSIUM 2005 [ www.ifv-bahntechnik.de/euro-info ] 15
Behaviour of slab track under
extreme stress conditions
European
Slab Track
Symposium Bruxelles
22 February 2005
HGT
6 m
5 m
4 m
3 m
2 m
1 m
0 m
BTS
GW
gravel
compacted sand
[SE]
sand
SE
sand
SE
sand
SW-SI
clay
injection zone 1
injection zone 2
crack injection
Underground situation and restoration method at Dallgow
. EUROPEAN SLAB TRACK SYMPOSIUM 2005 [ www.ifv-bahntechnik.de/euro-info ] 16
Behaviour of slab track under
extreme stress conditions
European
Slab Track
Symposium Bruxelles
22 February 2005 Dg, 11
Injection between the layers of the slab structure at high speed line from Hannover to Berlin, Dallgow
. EUROPEAN SLAB TRACK SYMPOSIUM 2005 [ www.ifv-bahntechnik.de/euro-info ] 17
Behaviour of slab track under
extreme stress conditions
European
Slab Track
Symposium Bruxelles
22 February 2005
-20,0
-15,0
-10,0
-5,0
0,0
5,0
10,0
northern rail
southern rail
settlement before restorationnorthern rail
southern rail
settlement after restoration
+ 90 m
area of restoration
0 mm
5 mm
10 mm
- 5 mm
- 10 mm
- 15 mm
- 20 mm
120,238 + 10 m + 20 m + 30 m + 40 m + 50 m + 60 m + 70 m + 80 m
Dg, 27
Restoration by injection at at high speed line from Hannover to Berlin, Dallgow
. EUROPEAN SLAB TRACK SYMPOSIUM 2005 [ www.ifv-bahntechnik.de/euro-info ] 18
Behaviour of slab track under
extreme stress conditions
European
Slab Track
Symposium Bruxelles
22 February 2005
� Settlements caused by substructure compaction due to
predominant static load have only little effect on slab
structure and can be readjusted
� Settlements caused by dynamic overload of the
substructure lead to extreme stress conditions of the slab track and require underground as well as slab structure
restoration
� Slab track-underground-interaction is essential for the
stress conditions of the slab track and can be verified by
dynamic response of the underground
Experiences with extreme settlements
under slab track
. EUROPEAN SLAB TRACK SYMPOSIUM 2005 [ www.ifv-bahntechnik.de/euro-info ] 19
Behaviour of slab track under
extreme stress conditions
European
Slab Track
Symposium Bruxelles
22 February 2005
� Accompanying field tests (underground investigation,
measurements, laboratory tests)
� Calculations using the Finite Element Method to investigate
the realistic behaviour of slab track
� Calibrate the calculations using measurement results
� Parameter studies for extreme conditions
Investigation of slab track behaviour
. EUROPEAN SLAB TRACK SYMPOSIUM 2005 [ www.ifv-bahntechnik.de/euro-info ] 20
Behaviour of slab track under
extreme stress conditions
European
Slab Track
Symposium Bruxelles
22 February 2005
Field test with slab track in Eckartshausen
. EUROPEAN SLAB TRACK SYMPOSIUM 2005 [ www.ifv-bahntechnik.de/euro-info ] 21
Behaviour of slab track under
extreme stress conditions
European
Slab Track
Symposium Bruxelles
22 February 2005
Results of the field test in Eckartshausen
� Very high dynamic loads (vibrating 2 axle loads each
200 kN) caused settlements up to 20 mm
� Slab track spanned over settlement hollow but did not
break
� Adhesion losses between concrete slab and hydraulic
bonded layer
� Fibre reinforced concrete increases elasticity and load
bearing capacity
. EUROPEAN SLAB TRACK SYMPOSIUM 2005 [ www.ifv-bahntechnik.de/euro-info ] 22
Behaviour of slab track under
extreme stress conditions
European
Slab Track
Symposium Bruxelles
22 February 2005
Modelling slab track using the Finite Element Method
. EUROPEAN SLAB TRACK SYMPOSIUM 2005 [ www.ifv-bahntechnik.de/euro-info ] 23
Behaviour of slab track under
extreme stress conditions
European
Slab Track
Symposium Bruxelles
22 February 2005
� Bending stresses in the hydraulic bonded layer are smaller
than the stresses derived from standard calculation method in
Germany
� Adhesion losses between concrete slab and hydraulic bonded
layer cause comparatively little stress increase because of friction preservation
� Calibration of the Finite Element Model using measured vertical deflection due to dynamic loads (0,1 – 0,4 mm) leads
to very rigid material behaviour
� Change of underground stiffness in longitudinal direction up to
10 times causes change of stresses up to 2 times
Analysis results
. EUROPEAN SLAB TRACK SYMPOSIUM 2005 [ www.ifv-bahntechnik.de/euro-info ] 24
Behaviour of slab track under
extreme stress conditions
European
Slab Track
Symposium Bruxelles
22 February 2005
Outlook: Realistic prediction of settlements due to rail loads
Finite Element Model of the substructure using a constitutive law with intergranular strain (hypoplasticity)
. EUROPEAN SLAB TRACK SYMPOSIUM 2005 [ www.ifv-bahntechnik.de/euro-info ] 25
Behaviour of slab track under
extreme stress conditions
European
Slab Track
Symposium Bruxelles
22 February 2005
. EUROPEAN SLAB TRACK SYMPOSIUM 2005 [ www.ifv-bahntechnik.de/euro-info ] 26
Behaviour of slab track under
extreme stress conditions
European
Slab Track
Symposium Bruxelles
22 February 2005
Settlement after 10 load cycles
0 30 60 90 120-1,e-3
-8,e-4
-6,e-4
-4,e-4
-2,e-4
0,0
axle load [kN/m]
se
ttle
me
nt
[m]
. EUROPEAN SLAB TRACK SYMPOSIUM 2005 [ www.ifv-bahntechnik.de/euro-info ] 27
Behaviour of slab track under
extreme stress conditions
European
Slab Track
Symposium Bruxelles
22 February 2005
Behaviour of slab track
under extreme stress conditions
Dr.-Ing. Lutz VogtPD Dr.-Ing. Peter-Andreas von WolffersdorffDr.-Ing. Erich Rehfeld
phone: +49 (0) 351 824 13 50http://www.baugrund-dresden.deinfo@baugrund-dresden.de
European Slab Track Symposium, Bruxelles, 22. February 2005 13:25 - 13:50
. EUROPEAN SLAB TRACK SYMPOSIUM 2005 [ www.ifv-bahntechnik.de/euro-info ] 28
Behaviour of slab track under
extreme stress conditions
European
Slab Track
Symposium Bruxelles
22 February 2005
Rail head deterioration after grinding
. EUROPEAN SLAB TRACK SYMPOSIUM 2005 [ www.ifv-bahntechnik.de/euro-info ] 29
Behaviour of slab track under
extreme stress conditions
European
Slab Track
Symposium Bruxelles
22 February 2005
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1011121314151617181920
0 50 100 150 200 250 300
Measurement of particle velocity for various train velocity
train velocity [km/h]
eff
ective
pa
rtic
le v
elo
city [
mm
/s]
measurement position: top of concrete slab
area with underground defects
before restoration
area with underground defects
after restoration
reference area