考虑土体固液二相性质的地下管线地震反应研究

本文将管线周围的土体视为固-液二相介质，采用考虑地震过程中土体内孔隙水压力的增长和消散的有效应力分析方法，并以非线性的土体本构模型模拟土体动力特性的改变以及在孔隙水压作用下的变形，以求接近土体的真实地震反应。研究表明随着土体软化程度的不同，受到土体约束的管线应力亦发生相应变化。文中详细研究了地震动峰值、管线直径、行波波速和入射角度等对管线应力的影响。

Research on seismic response of underground pipelines in solid-liquid media

In this paper, the soil around the pipeline is regarded as a solid-liquid medium. The effective stress method, which can consider the developmentand dissipationof pore water pressure is used, and the non-linear soil model is adopted to simulate the change of soil dynamicproperties and the deformation under pore water pressure. The seismic responses of the soil can be more close to the true condition. The research shows that, the stress of the pipe, which is restrained by surrounding soil, is different when the softness of the soil is different. Then some factors which influence the stress of the pipeline are investigated, including the peak valueof ground motion, the diameter of pipeline, the propagation speed of traveling waveand the angle of incidence.