Experimental study on mechanical properties of heavy-haul low-vibration track under train static load

Guo, Wuji; Zeng, Zhiping; Li, Shiye; Wei-dong, Wang; Shuaibu, Abdulmumin Ahmed; Chen, Zhuo

doi:10.1177/0036850420927249

Cited by 3 publications

(9 citation statements)

References 18 publications

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“…The corner of the sleeper is a bulge, which can easily cause strain concentration. It has been demonstrated that the strain here is in a large state [26]. In the test, measuring points 5 and 6 were not only located at the corner of the sleeper, but also at the outside of the self-compacting concrete cushion, which means that the bottom of points 5 and 6 was in the suspended state.…”

Section: Strain Of the Sleeper Slab Trackmentioning

confidence: 89%

Study on the Mechanical Characteristics of the Sleeper Slab Track on a Long-Span Steel Truss Bridge

et al. 2021

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This paper uses the long-span steel truss slab track as its research subject to analyze the new type of sleeper slab track structure with an experimental method. Firstly, a full-scale model was established in the laboratory to form a “rail–sleeper slab–self-compacting concrete cushion–steel beam” composite structure, and a fatigue test was performed on the track structure. The cyclic load was set up as a sine form with a range between 75 and 375 kN at a 5 Hz interval and 3 × 106 cycles. Based on the test, the performance of the track structure under cyclic train load was studied. Secondly, after every 106 loading cycles, the vertical static loading test and horizontal resistance test of the track structure were carried out to obtain the strain and displacement under different loading cycles. Finally, after 3 × 106 cycles of sine cyclic loading, the horizontal ultimate resistance test of the track structure was carried out to study its horizontal failure mode. The aims of this paper were to verify the applicability of the sleeper slab track, identify the mechanical properties, and determine the unfavorable position. The findings can provide an important reference for the practical use of the sleeper slab track structure.

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Section: Strain Of the Sleeper Slab Trackmentioning

confidence: 89%

Study on the Mechanical Characteristics of the Sleeper Slab Track on a Long-Span Steel Truss Bridge

et al. 2021

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“…The main shortcomings are the following: the new and old concrete junction area is larger, crack control is more difficult; the weight of prefabricated sleepers is larger, compared with DBT, it is more difficult to transport, assemble and lay. (3) LVT The LVT structure (Figure 4) mainly includes concrete track bed slab, elastic support block (concrete support block, rubber boot cover, rubber pad under the block) and supporting fasteners [15]. LVT is composed of rubber or other elastic composite boots at the lower part and around the double-piece sleeper (or two independent support blocks).…”

Section: Introduction 1engineering Backgroundmentioning

confidence: 99%

“…The main disadvantages are the following: poor waterproof and dustproof performance of boots; durability of elastic elements in the structure; relatively weak retaining ability of track geometry. (3) LVT The LVT structure (Figure 4) mainly includes concrete track bed slab, elastic support block (concrete support block, rubber boot cover, rubber pad under the block) and supporting fasteners [15]. LVT is composed of rubber or other elastic composite boots at the lower part and around the double-piece sleeper (or two independent support blocks).…”

Section: Introduction 1engineering Backgroundmentioning

confidence: 99%

“…Compared with DBT and slab ballastless track, LVT has the advantages of low cost, good elasticity and vibration reduction performance, and convenient maintenance and repair. Compared with other types of ballastless track types, LVT has lower cost and better economy [15]. Therefore, the LVT system has been widely used in domestic and foreign railways and urban rail transit tunnels, such as the English Channel Tunnel, China Yiwan Line, Xiangyu Line, Qiangui Line, Xikang Line, Lanwu Second Line, Hong Kong Metro, Guangzhou Metro, and the United States Atlanta subway and so on.…”

Section: Introduction 1engineering Backgroundmentioning

confidence: 99%

“…economy [15]. Therefore, the LVT system has been widely used in domestic and foreign railways and urban rail transit tunnels, such as the English Channel Tunnel, China Yiwan Line, Xiangyu Line, Qiangui Line, Xikang Line, Lanwu Second Line, Hong Kong Metro, Guangzhou Metro, and the United States Atlanta subway and so on.…”

Section: Introduction 1engineering Backgroundmentioning

confidence: 99%

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Research on Mechanical Performance of Improved Low Vibration Track and Its Feasibility Analysis for Heavy-Haul Railway Applications

et al. 2021

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With the gradual increase of the cargo weight of heavy-haul trains, the traditional ballasted track with the accumulation of stone and ballast has been unable to meet its structural safety requirements. From the comparison of the three common ballastless tracks in China, it can be seen that the low-vibration track (LVT) has the advantages of reasonable structure, low cost, and easy maintenance. Therefore, the design and research of heavy-haul railways are focused on, and it is urgent to study the applicability of LVT in heavy-haul railways. Method: By improving the slope of the short side of the LVT support block, the support block has a better load bearing capacity, so as to achieve the purpose of bearing a larger axle load. Through 1:1 full-scale model test and finite element simulation, the static mechanical properties of Improved LVT (ILVT) and Traditional LVT (TLVT) are compared and analyzed. Result: Compared with TLVT, ILVT has smaller vertical displacement and track gauge changes when subjected to the same load. The proven and reliable finite element model also shows that ILVT’s load sharing is less affected. In the case of achieving the same deformation, ILVT can withstand greater vertical and lateral loads. Conclusions: Compared with the TLVT, the ILVT design can reduce the vertical displacement of the rail and the supporting block, better control the track subsidence, and improve the driving safety of the LVT. At the same time, ILVT improves the anti-overturning ability of the rail and support block under lateral load, reduces the expansion of the gauge and the lateral spacing of the support block, and improves the stability of the track structure. ILVT can also be considered for the weight of 40t and other large axle load, and has broad application prospects.

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Research on Dynamic Performance of CRTSⅢ Type Slab Ballastless Track under Long-Term Service

et al. 2022

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To fill the blank in the research on the dynamic performance of track structure under long-term service, the dynamic response study of China Railway Track System Ⅲ type slab ballastless track (CRTSIII SBT) under the action of fatigue for 30 million times and the parting between track slab and self-compacting concrete (SCC) was carried out. By establishing the finite element model of the CRTSIII SBT structure and taking the stiffness change of isolation layer and fastener under fatigue state and the parting during service as the research objects, combined with the full-scale model test, the dynamic response amplitude and vibration law of track structure was analyzed based on the finite element model of axle falling test method. The results show the following: (1) Under the fatigue load, the acceleration of rail and base increases obviously, the longitudinal tensile stress of SCC surface decreases, the longitudinal tensile stress of base surface increases, and the vertical stress of each layer of track structure increases as well. (2) Under the action of the parting, the dynamic response of each structural layer increases, and the change of acceleration and stress of each layer under the action point of axle falling is the most obvious. (3) The fatigue load will weaken the vibration damping performance of the track, and the parting will continue to develop under the action of the falling axle, resulting in partial or total failure of the SCC layer. Both of them will aggravate the dynamic response of the track structure and affect driving safety, which should be paid attention to during maintenance.

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Experimental study on mechanical properties of heavy-haul low-vibration track under train static load

Cited by 3 publications

References 18 publications

Study on the Mechanical Characteristics of the Sleeper Slab Track on a Long-Span Steel Truss Bridge

Study on the Mechanical Characteristics of the Sleeper Slab Track on a Long-Span Steel Truss Bridge

Research on Mechanical Performance of Improved Low Vibration Track and Its Feasibility Analysis for Heavy-Haul Railway Applications

Research on Dynamic Performance of CRTSⅢ Type Slab Ballastless Track under Long-Term Service

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