摘要
针对１９２０ 年海原大地震（ Ｍｓ ＝ ８ ．５） ，１７１８ 年通渭大地震（ Ｍｓ ＝ ７ ．５） 和１６５４ 年天水大地震（ Ｍｓ ＝ ８ ．０） 等诱发的高速黄土滑坡所出现的种种现象与特征，提出了一种地震诱发高速黄土滑坡的机理———黄土体解体、斜抛和粉尘化效应。通过动力变形分析导出了黄土滑体斜抛运动的全过程及滑速、滑距公式。以海原大地震时，西吉县（１０°区） 回回川高速黄土滑坡为例，对这些公式进行验证，结果与实际情况相符。
In this paper,due considerations have been paid to the characteristic features and phenomena of the tremendous loess landslides induced by the 1920 Haiyuan earthquake (M s =8.5),the 1718 Tongwei earthquake (M s =7.5)and the 1654 Tianshui earthquake (M s =8.0).All of them occurred in the loess Plateau of Northwest China .Based on these features and phenomena such as large extents,high sliding speeds and long travelling distances,an inducing mechanism,e.g.the loess mass disintegration oblique projection collision between loess blocks and pulverization under the joint action of vertical and horizontal seismic acceleration is presented.Through dynamic deformation analysis,the whole process of loess mass obligue projection movement and the formulae of sliding speed and travelling distance of earthquake induced loess landslide are deducted.Earthquake triggered Huihuichuan loess landslide,Xiji county,Ningxia autonomous region of hui minority,is cited as an example to verify these formulae.The computed results quite agree with the evidences in the field.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
1999年第6期670-674,共5页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金
陕西省自然科学基金
关键词
黄土滑坡
地震
解体
粉尘化
滑坡
loess landslide,earthquake,disintegration,pulverization
