为研究地震诱发沙土液化对高速铁路车桥系统动力响应的影响，以某(88+168+88)m预应力混凝土连续刚构桥为例，采用Winkler地基梁模拟群桩基础并通过“m法”考虑桩土相互作用，同时引入液化土力学指标折减系数Ψ模拟砂土液化，建立了带有群桩基础的全桥有限元模型。在此基础上，基于TTBSAS程序系统研究了液化深度和液化程度对车桥系统动力响应的影响并分析了桥上列车的行车安全性。结果表明：桥梁横向位移随液化深度的增加会显著增大，而横向加速度的变化规律还与列车车速有关；行车安全性指标随液化深度的增加均增大，但增幅小于桥梁位移，且液化深度对桥上列车行车安全性的影响会随车速的增大逐渐减弱；液化程度对车桥系统动力响应的影响与液化深度基本一致；不考虑场地沙土液化会高估列车过桥的行车安全性，其中：对于脱轨系数指标，考虑与不考虑沙土液化时的安全车速阈值分别为275km/h和300km/h，对于轮对横向水平力指标，分别为200km/h和225km/h。本文的研究成果可为液化场地高速铁路桥梁的行车安全评价提供参考。
关键词：高速铁路；车桥系统；砂土液化；动力响应；安全车速
Abstract
To study the influence of earthquake-induced sand liquefaction on the dynamic response of high-speed railway train-bridge system (TBS), considering a (88m+168m+88m) PC continuous rigid frame bridge as an example. In the process of establishing the finite element model, the pile group foundation is simulated by Winkler foundation beam and the pile-soil interaction is considered by "m method". At the same time, the liquefied soil mechanics index reduction coefficient ψ is introduced to simulate sand liquefaction. On the basis above, and based on the TTBSAS program, the effect of liquefaction depth and liquefaction degree on the TBS is systematically studied, and the running safety of the train is analyzed. The result indicates that the bridge lateral displacement surge significantly with the increasing liquefaction depth, and the variation of bridge lateral acceleration is also related to train speed; The development of liquefaction depth lead to the general aggravation of running safety indicators, but this influence will gradually weaken with train speed rise; Compare with liquefaction depth, the influence of liquefaction degree on the TBS is basically similar; The safety of high-speed train passing by bridges will been overestimate without considering the sand liquefaction of the site. For the derailment coefficient index, the safe speed thresholds with and without considering sand liquefaction are 275km/h and 300km/h respectively, and the lateral horizontal force indexes of wheelsets are 200km/h and 225km/h, respectively. This research result could be a reference for the running safety evaluation of high-speed railway system located in liquefaction sites.
Key Words: High-speed railway; train-bridge system; sand liquefaction; dynamic responses; safety speed
关键词
高速铁路 /
车桥系统 /
砂土液化 /
动力响应 /
安全车速
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Key words
High-speed railway /
train-bridge system /
sand liquefaction /
dynamic responses /
safety speed
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