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皖南山区阳台古滑坡形成机制研究

     

摘要

High rock slope with laminated structure is inclined to generate toppling deformation. Plenty of large size landslides in mountain areas occurred in the toppling rock mass slope. Therefore, it is important for landslides stability evaluation to study on the mechanism of toppling-landslide process. In this paper, the Yangtai landslide is taken as a case to study the toppling - landslide process. Based on the engineering geological survey of the Yangtai landslide, the failure process and triggering factors are studied by combination of qualitative analysis, discrete element and limited element methods. The results indicate that the failure process of the Yangtai landslide include rock mass unloading, toppling deformation, sliding, and secondary landslide.%陡倾层状岩质斜坡易产生倾倒变形,在山区可见大量由倾倒变形发展形成的大型滑坡,研究其形成机制对于正确评价边坡稳定性具有重要意义.本文以皖南山区阳台滑坡为例,在工程地质勘察的基础上,采用定性分析、二维离散元和有限元相结合的方法,详细研究了阳台滑坡的变形破坏过程及其影响因素.研究结果表明,阳台古滑坡的形成包括河流下切—岩体卸荷回弹、倾倒变形逐步发展、滑面发展—整体破坏、堆积体次级变形4个阶段.这类滑坡的防治应重点控制滑坡前缘的变形,并做好截排水工作.

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