地铁浮置板轨道环境振动测试与评估

Environmental Vibration Test and Evaluation of the Floating Slab Track in Subway

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 the design and test of the curve tunnel in Beijing Metro Line 7, the differences of two kinds of vibra- tion prediction models were studied in evaluation of vibration, and some suggestions were presented during the standard transition period. The model of metro-rail-fastener-floating slab track was established to calculate the wheel-rail force of floating slab track. Then, the spread and attenuation of vibration in the strata of applying the wheel-rail force as an external force in the rail-fastener-floating slab track-tunnel-ground model were researched. The method was simple and effective, which could avoid the problems of time consuming of calculating coupling vibration and high requirements in hardware. Through the comparison of environmental impact vibration assessment, simulation analysis and field test, the prediction ac- curacies of environmental impact vibration assessment and simulation analysis were analyzed. Meanwhile, the effectiveness of the floating slab track in design was validated. The research results could provide a reference for similar subway vibration evaluation.