兰临高速公路袁家湾滑坡演化机理

位于兰临高速公路k15 000～k15 500段的袁家湾滑坡系公路修建时开挖高陡边坡所诱发的顺层岩质滑坡,因工程设计和岩体结构等原因,从开挖伊始直到运营期间,该滑坡一直持续滑动而久治不愈,滑坡规模大、危害严重,具有重复性和继承性滑动特征。根据其地质条件、工程特征以及滑动特征和滑动历史,采用工程地质分析、物理模型试验和FLAC3D数值模拟等方法,分析了该滑坡产生的原因、演化机理和过程。

Evolution mechanism of Yuanjiawan Landslide in Lanzhou-Lintao Expressway

The Yuanjiawan Landslide,located on the section of k15 000-k15 500 of the Lanzhou-Lintao expressway,is a bedding landslide triggered by cutting the high and steep slope.The landslide has been slided during excavation and exertion of the highway.It is a large-scale and harmful landslide with the characteristics of repetition and succession due to its geological condition,rock mass structure and the design of the slope of the expressway.Based on geological condition,project feature and the characteristics and history of sliding,the causes of occurrence and the mechanism and process of evolution of the landslide are comprehensively analysed by using engineering geology,physical model test and FLAC3D numerical simulation.