高速列车振动荷载作用下沉管地基整体稳定性研究

通过数值模拟方法研究高速列车在通过沉管隧道时,对沉管地基的影响,分析评价沉管地基在高速列车作用下的液化可能性。利用车轨动力相互作用模型,重新研究确定高速列车在不同速度下作用于沉管隧道整体道床上的动荷载;对沉管隧道的三个典型断面,计算高速列车动载作用下地基的最大剪应力分布;最后确定了沉管地基3种等效振次的抗液化剪应力。结果表明长江沉管隧道地基有足够的能力抵抗列车的周期性荷载。

Study on Integral Stability of Immersed Tube Base under High-speed Train Vibratory Load

Through arithmetic simulation, the paper studies the influence against the immersed tube base by the passing high speed train, analyses the liquefaction possibility of the (immersed) tube base under such action. It (uses) the train/track interaction model to restudy the dynamic loads acting on the integrated slab track of the (immersed) tube tunnel by the high-speed train running at different speeds. It then recalculates the maximum shear force distribution on three different profiles under the action of the high-speed train dynamic load. It at last sets the anti-liquefaction shearing strength of the three different kinds of equivalent strength-cycle-times. It is found that the base has sufficient capacity to resist the periodical loading of the high-speed train.