关键词: 双层行车结构; 动力特性; 路基结构; 陡坡地形; 振动台试验;

Abstract: In order to better solve the problem of constructing multi-lane highway under steep mountain terrain conditions, ‘pile-anchor-frame' composite subgrade structure as a new type has been proposed in recent years.It has a sound economic performance and environmental protection significance.In this paper, we study the dynamic characteristics and change laws of this structural system by indoor shaking table test, such as dynamic amplification factors, displacement and deformation, internal force and other dynamic responses of each component of the structural system.The results show that when the peak acceleration of input earthquake is less than 0.6 g, the structure can maintain elastic status, otherwise the structure enters elastic-plastic status.The experimental results improve that it has higher dynamic stability, stronger structural bearing capacity and better effect on retaining the slope soil under earthquake.

Key words: double-decked highway structure; dynamic characteristics; subgrade structure; steep terrain; shaking table test;