摘要
求解地铁地下结构的隧道-土体系统在沿轴向传播的剪切波作用下的反应一般使用常规的拟静力方法,该方法只能简单考虑系统的静力刚度特性而忽略了波的传播对于土体刚度的影响。通过动力有限元分析发现,此方法在某些情况下可能引起很大的误差。在研究了隧道-土体系统的动力相互作用机理的基础上,本文提出了一种对于此类动力反应问题的简化计算方法和相应的经验公式。本方法能够全面考虑隧道-土体系统的运动相互作用和惯性相互作用,通过与动力反应分析结果的对比发现,它具有令人满意的精度;由于采用了与传统拟静力方法相似的简单形式,这种方法容易在设计实践中得到应用。
The shear waves propagating along a subway tunnel may induce bending deformation. The conventional pseudo-static method considers the stiffness of the soil medium with a static reaction factor, and ignores the effect induced by propagating of the shear wave. Dynamic finite element analysis is performed to investigate the interaction mechanism of tunnel-soil system. A simplified analysis method is presented by adopting a dynamic reaction coefficient of the soil medium K(h), by which the effect of wave propagation can be taken into account. Empirical formula for calculating K(h) is also presented and the effectiveness of the method for both uniform and non-uniform tunnel is verified by the consistency of its results and that of dynamic finite element method. Because of its simplicity, it can be easily adopted in design practice of subway structure.
出处
《地震工程与工程振动》
CSCD
北大核心
2004年第3期44-50,共7页
Earthquake Engineering and Engineering Dynamics
基金
北京市自然科学基金项目(8011002)
关键词
地铁
抗震设计
地震反应分析
土一结构相互作用
简化设计方法
Subway
seismic design
seismic response analysis
soil-structure interaction
simplified design method
