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ROADS2RAILSInnovative new concept for asphalt based railway construction
Tulika Bose
PhD student
Russel da Silva
Senior Consultant Permanent-Way
ROADS2RAILS Project Group
Arkil
Atkins
Danish Technological Institute
Rail Net Denmark
Technical University of Denmark
Financially supported by Innovation Fund Denmark
RAILcph 2017 215/5/2017
RAILcph 2017 315/5/2017
ROADS2RAILS Ballasted Track
Components:
Ballast
SleeperRail
Subgrade
Subballast
RAILcph 2017 415/5/2017
ROADS2RAILS Ballasted Track
Ballast:
Granular materials [31,5mm - 50mm].
Vertical, lateral and longitudinal resistance.
Easy maintenance.
Track drainage.
Subballast
Ballast
SleeperRail
Subgrade
RAILcph 2017 515/5/2017
ROADS2RAILS Ballasted Track
Subballast:
Lower layer of superstructure.
Hard surface - SG II 0/31,5.
Fast draining gravel - 0/8, 0/11,2 or 0/16.
Track drainage.
Separation.
Frost protection.Subballast
Ballast
SleeperRail
Subgrade
RAILcph 2017 615/5/2017
ROADS2RAILS Ballasted Track
Ballast Fouling:High cyclic stress levels
Ballast
degradation
Ballast-
fouling
Frequent maintenance
(a)New ballast
(b)Partially-fouled
ballast
(c)Fully-fouled
ballast
RAILcph 2017 715/5/2017
ROADS2RAILS Ballasted Track
Ballast fouling
Reduced track
drainage
Lowered resistance
Concerns:
Frequent and costly maintenance.
Non-availability of the track.
Delays.
Frequent maintenance
RAILcph 2017 815/5/2017
ROADS2RAILS Goals
Demands from rail transportation:
Faster trains.
Heavier axle loads.
Increased train frequencies.
Safe
Comfortable
Reliable
RAILcph 2017 915/5/2017
ROADS2RAILS Alternative Trackforms
Ballasted track
Subballast
Ballast
SleeperRail
Subgrade
Subballast
Ballast
SleeperRail
Subgrade
Asphalt
Asphalt combination
RAILcph 2017 1015/5/2017
ROADS2RAILS Alternative Trackforms
Subballast
Ballast
SleeperRail
Subgrade
Asphalt
Asphalt combination
RailSleeper
Asphalt
Ballast
Subgrade
Asphalt underlayment
RAILcph 2017 1115/5/2017
ROADS2RAILS Alternative Trackforms
Rail
Aggregate base
Concrete
Subgrade
Slab track system
Aggregate base
Asphalt
SleeperRail
Subgrade
Asphalt overlayment
Asphalt based solution
RAILcph 2017 1215/5/2017
ROADS2RAILS Project Idea
Subballast
Ballast
SleeperRail
Subgrade
Aggregate base
Asphalt
SleeperRail
Subgrade
Replacement of granular ballast and subballast with asphalt layers.
RAILcph 2017 1315/5/2017
ROADS2RAILS Expected Advantages
1. Structural
Improved:
a. Subgrade moisture protection.
b. Load spreadability.
c. Bridging over weak spots.
2. Environmental
a. Lower vibration and noise levels.
b. Recyclability.
RAILcph 2017 1415/5/2017
ROADS2RAILS Expected Advantages
3. Economic
Lower:
a. Maintenance.
b. Life cycle cost.
Boost Danish asphalt industry.
4. Others
a. Expertise in asphalt work.
RAILcph 2017 1515/5/2017
ROADS2RAILS Challenges
More detailed geotechnical investigation.
Lateral force transfer between sleeper and asphalt.
Maintenance, when needed.
Aggregate base
Asphalt
Sleeper
Rail
Subgrade
RAILcph 2017 1615/5/2017
WP1
WP2
WP3WP4
WP5
WP6
Structural Model
Mix Design
Experimental set-up
Environmental Factors
Dissemination Activities
Project Management
ROADS2RAILS Work Packages
RAILcph 2017 1715/5/2017
ROADS2RAILS Work Packages
WP1
WP2
WP3WP4
WP5
WP6
Structural Model
Mix Design
Experimental set-up
Environmental Factors
Dissemination Activities
Project Management
RAILcph 2017 1815/5/2017
ROADS2RAILS Structural model
1. 2-D Numerical Finite Element model
Rail , EI
Support, k
P
RAILcph 2017 1915/5/2017
ROADS2RAILS Static Analysis
0,20
0,40
0,60
0,80
1,00
1,20
1,40
20,0 40,0 60,0 80,0 100,0 120,0
Dis
pla
cem
ent,
mm
Track modulus, MPa
Variation of Vertical displacement with Track Modulus
Analytical
Numerical
-0,1
0,0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
-10,0 -5,0 0,0 5,0 10,0
Dis
pla
cem
ent,
mm
Distance along beam, m
k =80 MPa
k =100 MPa
RAILcph 2017 2015/5/2017
ROADS2RAILS Structural model
1. 2-D Numerical Finite Element models
Rail , m, EI
Support, k
P, V
50
100
150
200
250
20,0 40,0 60,0 80,0 100,0 120,0
Fun
dam
enta
l Fre
qu
en
cy, H
z
Track modulus, MPa
Variation of Fundamental Frequency with Track Modulus
RAILcph 2017 2115/5/2017
ROADS2RAILS Dynamic Analysis
-0,8
-0,6
-0,4
-0,2
0,0
0,2
-0,06 -0,04 -0,02 0,00 0,02 0,04 0,06
Dis
pla
cem
ent,
mm
Time, sec
k=80MPa
V=400m/secV=200m/secV=100m/sec
-1,2
-1,0
-0,8
-0,6
-0,4
-0,2
0,0
0,2
-6,0 -4,0 -2,0 0,0 2,0 4,0 6,0
Dis
pla
cem
ent,
mm
Relative distance between mid-point on beam and load, m
V=200m/sec
k=120MPak=80MPak=40MPa
ROADS2RAILS Structural model
2. 3-D Numerical finite element layered half-space models.
Challenges:
o Material Properties
Temperature
Rate of loading
Stress dependency
15/5/2017 RAILcph 2017 22
ROADS2RAILS Structural model
2. 3-D Numerical finite element layered half-space models.
Challenges:
o Analysis
Boundary conditions
Mesh refinement
Computational cost
15/5/2017 RAILcph 2017 23
RAILcph 2017 2415/5/2017
ROADS2RAILS Work Packages
WP1
WP2
WP3WP4
WP5
WP6
Structural Model
Mix Design
Experimental set-up
Environmental Factors
Dissemination Activities
Project Management
RAILcph 2017 2615/5/2017
ROADS2RAILS Experimental Set-up
1. Sleeper: Optimized to suit the new system.
2. Asphalt: Designed layers of asphalt.
3. Base layers: Granular layers.
4. Mattress: To mimic subgrade response.
Components:
RAILcph 2017 2715/5/2017
ROADS2RAILS Work in Progress….
1. WP1: Finite element model to be developed.
2. WP2: Novel asphalt type to be developed and tested.
3. WP3: Test facility to be constructed and instrumented.
4. WP4: LCC analysis.
5. WP5: Dissemination activities.
Contact:
DTU Civil Engineering ATKINSTulika Bose: PhD student Russel da SilvaE- Mail: [email protected] E- Mail: [email protected]