Effects of post-pouring belt void of base slab on track structure and train operation of CRTSⅡ slab track

YANG Rong-shan; WANG Jie; JIANG Heng-chang; CHEN Shuai; DU Jin-xin

doi:10.19818/j.cnki.1671-1637.2019.03.008

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YANG Rong-shan, WANG Jie, JIANG Heng-chang, CHEN Shuai, DU Jin-xin. Effects of post-pouring belt void of base slab on track structure and train operation of CRTSⅡ slab track[J]. Journal of Traffic and Transportation Engineering, 2019, 19(3): 71-78. doi: 10.19818/j.cnki.1671-1637.2019.03.008

Citation:

YANG Rong-shan, WANG Jie, JIANG Heng-chang, CHEN Shuai, DU Jin-xin. Effects of post-pouring belt void of base slab on track structure and train operation of CRTSⅡ slab track[J]. Journal of Traffic and Transportation Engineering, 2019, 19(3): 71-78. doi: 10.19818/j.cnki.1671-1637.2019.03.008

Citation:

YANG Rong-shan, WANG Jie, JIANG Heng-chang, CHEN Shuai, DU Jin-xin. Effects of post-pouring belt void of base slab on track structure and train operation of CRTSⅡ slab track[J]. Journal of Traffic and Transportation Engineering, 2019, 19(3): 71-78. doi: 10.19818/j.cnki.1671-1637.2019.03.008

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Effects of post-pouring belt void of base slab on track structure and train operation of CRTSⅡ slab track

doi: 10.19818/j.cnki.1671-1637.2019.03.008

YANG Rong-shan^{1, 2},
WANG Jie^{1, 2},
JIANG Heng-chang^{1, 2},
CHEN Shuai^{1, 2},
DU Jin-xin^{1, 2}

1.
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
2.
Key Laboratory of High-Speed Railway Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

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Author Bio:
YANG Rong-shan(1975-), male, professor, PhD, swjtu-yrs@qq.com
Received Date: 2019-01-19
Publish Date: 2019-06-25

Abstract

Abstract

Under the uninterrupted train running condition, the post-pouring belt of CRTSⅡ slab track base slab on the bridge was repaired by using the ultra-high pressure water jet method. The statics calculation model of CRTSⅡ slab track structure was established, and the effects of post-pouring belt with different void length on the vertical displacements of rail and track slab and the tensile stress of track slab were analyzed. The vehicle-track coupling dynamics calculation model was established, and the influences of normal running on track structure, running safety and comfort were analyzed when the complete void length of the post-pouring belt of base slab was 1.0 m. Calculation result shows that under the action of 1.5 times static wheel load, the vertical displacements of rail and track slab increase with the increase of the void length of post-pouring belt. When the complete void length of post-pouring belt is 1.0 m, the vertical displacements of rail and track slab both increase by 0.03 mm, so the complete void has less effect on vertical displacements. When the void length of post-pouring belt is 0.7, 0.8, 0.9 and 1.0 m, respectively, the maximum tensile stress of track slab is 0.96, 1.12, 1.18 and 1.22 MPa, respectively. When the post-pouring belt completely voids, the maximum tensile stress is less than the designed tensile strength of 1.96 MPa, and the track slab will not crack. When the train speed is 300 km·h^-1 and the complete void length of post-pouring belt is 1.0 m, the maximum vertical displacements of rail and track slab are 0.91 and 0.32 mm, and less than the reference values of 1.5 and 0.4 mm in Technical Regulations for Dynamic Acceptance for High-Speed Railways Construction (TB 10761—2013), which shows that the normal running after post-pouring belt voids can not cause great influence on the track structure. When the complete void of post-pouring belt occures, the vertical acceleration of track slab is about 3 times of the value under the normal condition, which indicates that normal running will increase the vibration intensity of the lower foundation. The statics and dynamics analysis results show that using the ultra-high pressure water jet method to repair the post-pouring belt of base slab can allow the train travel at normal speeds.
- railway engineering,
- slab track,
- post-pouring belt,
- ultra-high pressure water jet method,
- track structure,
- vertical displacement,
- wheel-rail vertical force

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References(31)

References

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Effects of post-pouring belt void of base slab on track structure and train operation of CRTSⅡ slab track

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