人工土山的地震永久变形分析

Seismic permanent deformation of earth-fill hill

人工土山的地震稳定性评价是其设计与建造过程中的关键问题之一,目前还没有得到很好地解决。采用等效黏弹性分析理论和Newmark滑块位移法对土山的地震永久位移进行研究,分析了不同高度、坡度和地震动条件下人工土山的地震永久位移。发现当坡度较缓时,山坡最大位移滑块和拟静力法的最危险滑块不论是所处位置还是大小均有较明显差别。最后,根据土山最大地震永久位移量和屈服加速度的关系,提出利用屈服加速度估算人工土山地震永久位移的简便计算方法。

The seismic stability of earth-fill hill is one of the key problems in the process of design and construction, and has not been understood properly. The seismic permanent displacement of earth-fill hill is studied by means of the equivalent linear method and Newmark sliding block analysis. The influences of heights, average gradients and input ground motions on permanent displacement are investigated. When the slope is gentle, there are significant differences in size and sliding surface between the maximum displacement sliding mass and the most dangerous sliding block discriminated by the pseudo-static Bishop＇s method. Finally, using the yield acceleration of earth-fill hill, a simple method to estimate the seismic permanent displacement of earth-fill hill is proposed.