广深港高速铁路狮子洋隧道减振无砟轨道对周边软土地层影响分析

为防止高速列车振动引起广深港高铁狮子洋大断面盾构水底隧道软土地层液化风险,轨道结构采用减振板式无砟轨道。为考察减振措施效果,分别建立列车-轨道模型、隧道-地层有限元模型,分析列车荷载作用下隧道结构及周围土层动力响应及分布规律,对比分析减振和非减振两种工况下地层动剪应力和加速度,结果表明,采取减振措施可有效降低软土地层液化风险,提高安全储备,达到了预期的目标。研究成果对隧道穿越软土地层设计具有指导意义。

Analysis of Guangzhou-Shenzhen-Hong Kong High Speed Railway Shiziyang Tunnel Vibration Damping Ballastless Track Effect on Surrounding Soft Soil

To prevent the liquefaction of large section shield tunnel soft soil of Guangzhou- Shenzhen-Hong Kong high speed railway Shiziyang tunnel on account of high-speed train vibration,vibration damping ballastless track is adopted. To investigate the effect of vibration damping measures,this paper establishes the train-track finite element model and the tunnel-soil finite element model to analyze dynamic response and distribution of the tunnel structure and the surrounding soil under the train load,and compares the dynamic shear stress and acceleration with and without vibration damping. The results show that the vibration damping ballastless track can effectively reduce the risk of soft soil liquefaction,improve the safety stock,and achieve the expected goal. The research results may guide the design of tunnel through soft soil.