列车振动作用下沉管地基砂土液化可能性研究

Study of the Possibility of Sand Liquefaction of the Immersed Tube Tunnel Under Train Vibratioin

根据土动力学和轨道动力学的原理 ,利用列车 轨道系统动力分析模型和提出的隧道结构 地层动力分析模型 ,分析高速列车作用下沉管地基的动力响应 ,根据模型计算了京沪高速铁路南京上元门沉管隧道地基在高速列车作用下的动剪应力分布 ;通过对现场地质资料的回归分析得到了沉管隧道 3个典型断面的地基抗液化剪应力 ,据此分析了沉管地基在高速列车作用下的液化可能性 。

Based on the theory of soil dynamics and rail dynamics, the dynamic models of the train-rail system and the tunnel structure-stratum system are made use of to analyze the dynamic response of the immersed tube tunnel foundation under the action of the high-speed train. According to these models, the dynamic shear stress distribution of the foundation of the Shangyuanmen immersed tube tunnel on the Beijing-Shanghai High-Speed Railway Line is calculated when under the vibration of the high-speed train; by analyzing the geological information of the site, the liquefaction-resistant shear stress of the foundation of three typical sections of the immersed tube tunnel is acquired. Thus the possibility of foundation liquefaction of the immersed tube tunnel is analyzed so as to give reference to future design and construction of the immersed tube tunnel.