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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Random distribution characteristics of peak dynamic stress on the subgrade surface of heavy-haul railways considering track irregularities
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Random distribution characteristics of peak dynamic stress on the subgrade surface of heavy-haul railways considering track irregularities

机译：考虑轨道不平顺的重载铁路路基表面峰值动应力随机分布特征

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摘要

The dynamic response of the subgrade surface under moving train loads provides information for subgrade settlement prediction, condition evaluation and so forth. In this paper, a 3D dynamic finite element (FE) model that considers the interactions among the wagon, track and subgrade was built. Then, the irregular vertical track spectrum of the three major lines in China was applied to simulate track irregularity. Through numerical calculation, the influence of vertical track irregularity on the dynamic stress of subgrade surface was investigated. The distributions of peak dynamic stresses at three subgrade surface locations (under each of the two rails and at the track center) along the track under the passage of trains with various axle loads were statistically acquired. The normal distributions of the peak dynamic stresses on the subgrade surface were verified. The maximum peak dynamic stresses were forecasted. The results indicated that the dynamic stresses on the subgrade surface were asymmetric along the center of subgrade surface due to the random distribution of track irregularities, and the peak dynamic stresses were found to follow a normal distribution. With the increase of axle load, the dispersion of peak dynamic stresses increased gradually, and the distribution curve of peak dynamic stresses gradually became steeper. The computed peak dynamic stresses aligned well with the field test data, indicating that the 3D dynamic FE model and statistical analysis method were reasonable. The research results will provide a basis for the reliability analysis of the dynamic deformation and accumulated settlement of subgrade surface.
机译：路基表面在动车荷载作用下的动态响应为路基沉降预测，状态评估等提供了信息。在本文中，建立了一个3D动态有限元（FE）模型，该模型考虑了货车，轨道和路基之间的相互作用。然后，利用中国三大干线的垂直不规则轨道谱模拟了轨道不规则性。通过数值计算，研究了垂直轨道不平整度对路基表面动应力的影响。统计地获得了在具有各种车轴载荷的列车通过的情况下，沿轨道在三个路基表面位置（在两个轨道的每一个下方和轨道中心）沿轨道的峰值动应力的分布。验证了路基表面峰值动应力的正态分布。预测了最大峰值动态应力。结果表明，由于轨道不平顺的随机分布，路基表面的动应力沿路基表面的中心不对称，峰值动应力遵循正态分布。随着轴载荷的增加，峰值动应力的分散逐渐增大，峰值动应力的分布曲线逐渐变陡。计算出的峰值动应力与现场试验数据吻合良好，表明3D动态有限元模型和统计分析方法是合理的。研究结果将为路基表面动力变形和累积沉降的可靠度分析提供依据。

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