新型带水沟底板型隧道衬砌动力响应特性研究

Study on Dynamic Response Characteristics of a New Type of Floor Tunnel Lining with Ditch

为探究新型带水沟底板型衬砌在高速列车振动荷载作用下的动力响应特性,以贵南高铁典型低洼岩溶隧道九万山隧道为工程依托,采用扣件荷载公式,确定速度350 km/h高速列车作用下扣件荷载,利用三维有限差分程序建立三维动力数值分析模型,从位移、速度、应力、安全系数四个方面对比分析新型带水沟底板型衬砌和传统仰拱型衬砌在列车通过时的动力响应特性。结果表明,350 km/h高速列车经过隧道时,新型底板型衬砌安全系数变化很小,设计时不用单独考虑。

In order to explore the dynamic response characteristics of the new type of floor lining with ditch under the vibration load of high-speed train, based on Jiuwanshan Tunnel, a typical low-lying karst tunnel of Guiyang-Nanning High-speed Railway, we adopted the fastener load formula to determine the fastener load under the action of the 350 km/h high-speed train, used three-dimensional limited differential program to establish a three-dimensional power numerical analysis model, and started from the four aspects of displacement, speed, stress and safety factor to compare and analyze the dynamic response characteristics of the new type of floor lining with ditch and the traditional invert lining when the train passed. The results show that when the 350 km/h high-speed train passes through the tunnel, the safety factor of the new type of floor lining changes very little, so it’s not necessary to be considered separately in design.