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以北京地铁7号线某曲线段为依托,研究了两种环评振动预测模型在振动评估中的预测差异,提出当前标准过渡阶段对两种振动预测模型的处理建议。提出建立地铁列车-钢轨-扣件-浮置板轨道模型,来计算浮置板轨道的轮轨力,进而,将轮轨力作为外激励施加到钢轨-扣件-浮置板轨道-隧道-地层模型中研究振动在地层中的传播与衰减,该方法简单有效,避免了耦合振动计算耗时,硬件要求高的问题。通过对环评振动评估、仿真分析和现场实测的比较,分析了环评振动评估、仿真分析的预测精度,同时验证了设计方案中浮置板轨道在该地段的有效性。研究成果为类似地铁振动评估提供参考。
Based on a curve segment of Beijing Subway Line 7, this paper studies the differences in prediction of the two EIA vibration prediction models in vibration assessment, and puts forward suggestions for the treatment of the two vibration prediction models in the current standard transition phase. The metro train-rail-buckle-float plate rail model is proposed to calculate the wheel-rail force of the floating slab track, and then the wheel-rail force is applied as an external excitation to the rail-fastener-floating slab track- In the stratum model, the propagation and attenuation of vibration in the stratum are studied. The method is simple and effective, which avoids the time-consuming calculation of coupling vibration and the high hardware requirements. Through the comparison of the vibration assessment, simulation analysis and field measurement of the EIA, the prediction accuracy of the EIA vibration assessment and simulation analysis is analyzed. At the same time, the validity of the floating slab track in this design is verified. The research results provide a reference for similar subway vibration assessment.