ROADS2RAILS Innovative new concept for asphalt based railway construction

Transcription

1 Innovative new concept for asphalt based railway construction Tulika Bose PhD student Russel da Silva Senior Consultant Permanent-Way

2 Project Group Arkil Atkins Danish Technological Institute Rail Net Denmark Technical University of Denmark Financially supported by Innovation Fund Denmark RAILcph

3 Ballasted Track Components: Sleeper Rail Ballast Subballast Subgrade RAILcph

4 Ballasted Track Ballast: Granular materials [31,5mm - 50mm]. Vertical, lateral and longitudinal resistance. Easy maintenance. Track drainage. Sleeper Ballast Subballast Subgrade Rail RAILcph

5 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. Sleeper Rail Track drainage. Separation. Frost protection. Ballast Subballast Subgrade RAILcph

6 Ballasted Track High cyclic stress levels Ballast Fouling: Ballast degradation Ballastfouling (a) New ballast (b) Partially-fouled ballast (c) Fully-fouled ballast Frequent maintenance RAILcph

7 Ballasted Track Ballast fouling Concerns: Frequent maintenance Reduced track drainage Lowered resistance Frequent and costly maintenance. Non-availability of the track. Delays. RAILcph

8 Goals Demands from rail transportation: Faster trains. Heavier axle loads. Increased train frequencies. Reliable Comfortable Safe RAILcph

9 Alternative Trackforms Sleeper Rail Sleeper Rail Ballast Subballast Subgrade Ballast Asphalt Subballast Subgrade Ballasted track Asphalt combination RAILcph

10 Alternative Trackforms Sleeper Rail Sleeper Rail Ballast Asphalt Subgrade Ballast Asphalt Subballast Subgrade Asphalt underlayment Asphalt combination RAILcph

11 Alternative Trackforms Rail Sleeper Rail Concrete Aggregate base Subgrade Slab track system Asphalt Aggregate base Subgrade Asphalt overlayment RAILcph

12 Project Idea Asphalt based solution Sleeper Rail Sleeper Rail Ballast Subballast Subgrade Asphalt Aggregate base Subgrade Replacement of granular ballast and subballast with asphalt layers. RAILcph

13 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

14 Expected Advantages 3. Economic Lower: a. Maintenance. b. Life cycle cost. Boost Danish asphalt industry. 4. Others a. Expertise in asphalt work. RAILcph

15 Challenges More detailed geotechnical investigation. Lateral force transfer between sleeper and asphalt. Maintenance, when needed. Sleeper Rail Asphalt Aggregate base Subgrade RAILcph

16 Work Packages WP5 WP6 WP4 WP1 WP3 WP2 Structural Model Mix Design Experimental set-up Environmental Factors Dissemination Activities Project Management RAILcph

17 Work Packages WP5 WP6 WP4 WP1 WP3 WP2 Structural Model Mix Design Experimental set-up Environmental Factors Dissemination Activities Project Management RAILcph

18 Structural model 1. 2-D Numerical Finite Element model P Rail, EI Support, k RAILcph

19 Displacement, mm Displacement, mm ROADS2RAILS Static Analysis 1,40 1,20 Variation of Vertical displacement with Track Modulus Analytical 1,00 Numerical 0,80 0,60 0,40 0,20 20,0 40,0 60,0 80,0 100,0 120,0 Track modulus, MPa Distance along beam, m -10,0-5,0-0,1 0,0 5,0 10,0 0,0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 k =80 MPa k =100 MPa RAILcph

20 Fundamental Frequency, Hz ROADS2RAILS Structural model 1. 2-D Numerical Finite Element models P, V Support, k Rail, m, EI Variation of Fundamental Frequency with Track Modulus ,0 40,0 60,0 80,0 100,0 120,0 Track modulus, MPa RAILcph

21 Displacement, mm Displacement, mm ROADS2RAILS Dynamic Analysis Relative distance between mid-point on beam and load, m 0,2 0,0-6,0-4,0-2,0 0,0-0,2 2,0 4,0 6,0 V=200m/sec -0,4-0,6-0,8-1,0-1,2 k=120mpa k=80mpa k=40mpa k=80mpa Time, sec -0,8-0,6-0,4-0,2 V=400m/sec V=200m/sec V=100m/sec -0,06-0,04-0,02 0,00 0,02 0,04 0,06 0,0 0,2 RAILcph

22 Structural model 2. 3-D Numerical finite element layered half-space models. Challenges: o Material Properties Temperature Rate of loading Stress dependency RAILcph

23 Structural model 2. 3-D Numerical finite element layered half-space models. Challenges: o Analysis Boundary conditions Mesh refinement Computational cost RAILcph

24 Work Packages WP5 WP6 WP4 WP1 WP3 WP2 Structural Model Mix Design Experimental set-up Environmental Factors Dissemination Activities Project Management RAILcph

25 Experimental Set-up Basic sketch of test set-up RAILcph

26 Experimental Set-up Components: 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. RAILcph

27 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. RAILcph

28 Contact: DTU Civil Engineering ATKINS Tulika Bose: PhD student Russel da Silva E- Mail: E- Mail: