1 Introduction
2 Design Overview of Floating Slab Track
3 Field Test and Analysis
3.1 Appearance Detection of Rubber Bearings
3.2 Laboratory Test of Rubber Bearings
Test items | Test results | Design requirements | |
---|---|---|---|
Appearance size | Diameter/mm | 400.00~400.56 | 400 |
Thickness /mm | 74.20~74.82 | 75, After 1 × 107 cycles of load, the change value is no more than 1 mm | |
Shore hardness/shore A | 52 | 40 ± 5 | |
Tensile strength/MPa | 22.8 | ≥ 20 | |
Elongation at break/% | 543 | ≥ 600 | |
Constant compression permanent deformation | 24% | – | |
Stiffness | Static stiffness/kN/mm | 15.22 | 10~16 |
Static and static stiffness ratio | 1.343~1.442 | – |
3.3 Natural Vibration Characteristics of Floating Slab Track
Order number | Frequency/Hz | Damping/% |
---|---|---|
1 | 33.903 | 6.866 |
2 | 46.235 | 6.924 |
3 | 114.103 | 3.151 |
4 | 143.840 | 3.734 |
5 | 185.530 | 0.977 |
6 | 253.801 | 1.695 |
7 | 263.984 | 1.397 |
3.4 Damping Effect of Floating Slab Track
Section number | The speed of the car | Straight/curve | Type of orbit | Note |
---|---|---|---|---|
Section 1 | 46 km/h | A straight line | Ordinary orbit | They are a group of contrast cross sections |
Section 2 | 48 km/h | A straight line | Floating slab track |
Central/Hz | 1 | 1.25 | 1.6 | 2 | 2.5 | 3.15 | 4 | 5 | 6.3 | 8 |
---|---|---|---|---|---|---|---|---|---|---|
Weighting factor | 0.5 | 0.56 | 0.63 | 0.71 | 0.80 | 0.90 | 1.0 | 1.0 | 1.0 | 1.0 |
Central/Hz | 10 | 12.5 | 16 | 20 | 25 | 31.5 | 40 | 50 | 63 | 80 |
Weighting factor | 0.8 | 0.63 | 0.5 | 0.4 | 0.315 | 0.25 | 0.2 | 0.16 | 0.125 | 0.1 |
Project | Section 1 VLzmax1 | Section 2 VLzmax2 | Damping effect Δ |
---|---|---|---|
VLzmax/dB | 76.2 | 63.3 | 12.9 |
3.5 Dynamic Displacement of Floating Slab Track
Sample number | Vertical relative displacement of rail | Vertical displacement of floating slab | Transverse displacement of floating slab | Vertical absolute displacement of rail | ||||
---|---|---|---|---|---|---|---|---|
The end of sab | The middle of sab | The end of sab | The middle of sab | The end of sab | The middle of sab | The end of sab | The middle of sab | |
1 | −2.1 | −1.1 | −1.1 | −1.0 | −0.9 | −1.1 | −3.2 | −2.1 |
2 | −2.2 | −1.1 | −1.3 | −1.1 | −0.9 | −0.9 | −3.5 | −2.2 |
3 | −2.1 | −1.1 | −1.2 | −1.2 | −1.0 | −1.1 | −3.3 | −2.2 |
4 | −2.0 | −1.2 | −1.2 | −1.2 | −1.1 | −1.0 | −3.2 | −2.4 |
5 | −2.2 | −1.3 | −1.4 | −1.3 | −1.1 | −1.1 | −3.6 | −2.6 |
6 | −2.4 | −1.2 | −1.5 | −1.3 | −0.9 | −0.8 | −3.9 | −2.5 |
7 | −2.1 | −1.1 | −1.4 | −1.2 | −1.0 | −0.8 | −3.4 | −2.3 |
8 | −2.2 | −1.2 | −1.3 | −1.1 | −0.9 | −0.9 | −3.4 | −2.2 |
9 | −2.2 | −1.2 | −1.3 | −1.2 | −1.0 | −1.0 | −3.5 | −2.3 |
10 | −2.3 | −1.3 | −1.3 | −1.2 | −0.9 | −0.9 | −3.5 | −2.6 |
11 | −2.3 | −1.3 | −1.3 | −1.1 | −1.0 | −0.9 | −3.5 | −2.4 |
12 | −2.2 | −1.3 | −1.3 | −1.2 | −1.1 | −1.1 | −3.6 | −2.5 |
13 | −2.4 | −1.4 | −1.5 | −1.3 | −1.2 | −1.2 | −3.8 | −2.7 |
14 | −2.3 | −1.4 | −1.4 | −1.3 | −1.2 | −1.2 | −3.7 | −2.7 |
15 | −2.2 | −1.3 | −1.4 | −1.2 | −1.0 | −1.0 | −3.6 | −2.5 |
16 | −2.2 | −1.3 | −1.2 | −1.2 | −1.0 | −1.1 | −3.4 | −2.5 |
17 | −2.3 | −1.2 | −1.4 | −1.3 | −1.0 | −0.9 | −3.7 | −2.5 |
18 | 2.6 | −1.6 | −1.7 | −1.5 | −0.8 | −0.8 | −4.3 | −3.2 |
19 | −2.3 | −1.4 | −1.3 | −1.1 | −0.9 | −0.8 | −3.5 | −2.5 |
20 | −2.0 | −1.1 | −1.1 | −1.0 | −0.9 | −0.8 | −3.1 | −2.1 |
Mean value | −2.2 | −1.2 | −1.3 | −1.2 | −1.0 | −1.0 | −3.5 | −2.5 |