高速铁路富水黄土隧道隧底循环动载试验研究  

Cyclic dynamic test of water-rich loess tunnel subgrade for high-speed railway

作　　者：薛富春[1] 马建林[1] 颜利平 刘智毅[1] 程琴辉[1] 陈冲[1] 

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]洛杉矶市水电局,美国加州90012

出　　处：《振动与冲击》2010年第9期226-230,共5页Journal of Vibration and Shock

基　　金：铁道部科技研究开发计划重大课题;(2005K001-D(G)-3)

摘　　要：在高速列车循环振动荷载作用下,隧道仰拱和仰拱底部地基土中垂直振动速度和土压力沿深度的传递与衰减规律,是隧道设计不可缺少的重要参数。对于洞身位于地下水位以下的隧道,还需要考虑水压力的影响。国内外尚未见到有关这些问题研究的任何报道。依托铁道部科技研究开发计划重大课题,首次在富水黄土隧道内进行了模拟高速列车振动效应的循环动载试验,获得了不同加载频率下隧底垂直振动速度和土压力沿深度的衰减规律、恒定加载频率下不同深度的土压力变化规律、仰拱底部超静水压与不同频率下加载次数的关系。研究成果为隧道仰拱厚度和填充材料的优化设计提供了可能,为类似条件下隧道的设计和施工提供了试验依据和技术支持。Relying on the important issues of scientific research and development plan of the Ministry of Railways of P.R.C.,cyclic dynamic test that simulates the vibration induced by high-speed train has been put into practice in water-rich loess tunnel for the first time.The attenuation laws for vertical vibration velocity and earth pressure in and below the inverted arc of tunnel under different frequency excitation were obtained.The changing rule for earth pressure at different depth under constant frequency excitation was also achieved.The relationships of excess pore pressure to loading frequency and loading number were obtained and analyzed,comparing with monitoring results.The research fruits provide a reference to optimal design of the invert thickness and filling materials of tunnel,and provide experimental basis and technical support for design and construction of tunnel under analogous conditions.

关 键 词：富水黄土隧道 循环动载试验 垂直振动速度 动土压力 超静水压 

分 类 号：TU435[建筑科学—岩土工程]