Assessment of the maintenance effect for rock ballast bed during tamping operation

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL Transportation Geotechnics Pub Date : 2025-02-06 DOI:10.1016/j.trgeo.2025.101511

Shunwei Shi , Yanglong Zhong , Chang Liu , Xichong Ren , Yixiong Xiao , Chunyu Wang , Liang Gao

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Abstract

Tamping operation can damage rock ballast beds in railway; therefore, the assessment of maintenance effect is crucial for the safe running of a train. First, a ballasted track-tamping machine model was established using DEM-MFBD. Subsequently, a test method for the squeezing distance of tamping machine was developed and the model was verified. Using this model, the effects of tamping operation on mechanical states of rock ballast and sleeper were analyzed and the corresponding sensitive indicators were determined. Finally, the relationship between comprehensive mechanical state of ballast bed and squeezing distance was analyzed, and the assessment of maintenance effect was achieved. The results indicated that the coordination number and the compactness of ballast were sensitive to tamping, decreasing by 52.78% and 6.64% for 160 kN/mm stiffness, respectively. Additionally, the bottom contact density and pressure on sleeper were also sensitive to tamping, decreasing by 70.66% and 60.06%, respectively. The maintenance effect for rock ballast bed can be assessed according to the maximum squeezing distance of tamping machine.

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夯实作业中岩石压载床维护效果评价

夯实作业对铁路岩石道床有破坏作用；因此，维修效果评估对列车的安全运行至关重要。首先，利用DEM-MFBD建立了有碴轨道夯实机模型。随后，提出了一种夯实机挤压距离的测试方法，并对模型进行了验证。利用该模型分析了夯实作业对岩石压载物和轨枕力学状态的影响，确定了相应的敏感指标。最后，分析了压载床综合力学状态与挤压距离的关系，并对维修效果进行了评价。结果表明：当刚度为160 kN/mm时，镇流器的配合数和压实度对夯实较为敏感，分别降低了52.78%和6.64%；此外，底部接触密度和枕木压力对夯实也很敏感，分别下降了70.66%和60.06%。根据夯实机的最大挤压距离来评价对岩石压载床的维护效果。

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来源期刊

Transportation Geotechnics Social Sciences-Transportation

CiteScore

8.10

自引率

11.30%

发文量

194

审稿时长

51 days

期刊介绍： Transportation Geotechnics is a journal dedicated to publishing high-quality, theoretical, and applied papers that cover all facets of geotechnics for transportation infrastructure such as roads, highways, railways, underground railways, airfields, and waterways. The journal places a special emphasis on case studies that present original work relevant to the sustainable construction of transportation infrastructure. The scope of topics it addresses includes the geotechnical properties of geomaterials for sustainable and rational design and construction, the behavior of compacted and stabilized geomaterials, the use of geosynthetics and reinforcement in constructed layers and interlayers, ground improvement and slope stability for transportation infrastructures, compaction technology and management, maintenance technology, the impact of climate, embankments for highways and high-speed trains, transition zones, dredging, underwater geotechnics for infrastructure purposes, and the modeling of multi-layered structures and supporting ground under dynamic and repeated loads.