某多次治理滑坡的变形机理和经验教训

    THE DEFORMATION MECHANISM AND THE EXPERIENCE AND LESSONS OF A MULTIPLE TREATMENT LANDSLIDE

    • 摘要: 玻璃沟滑坡位于薛家湾镇玻璃沟左岸,为一牵引式堆填土滑坡。 2009~2012年数次治理工程失效,不得已对该滑坡再次进行勘察设计和整治工程。本文通过进一步勘测研究,剖析了玻璃沟滑坡的坡体结构和变形机理:人为改变自然坡体形态是滑坡形成的先天条件; 特殊的坡体结构为滑坡变形提供了物质基础; 地表水下渗、后山地下水及河床淤塞抬升是滑坡变形的诱发因素; 坡脚开挖进一步加剧滑坡变形。在对滑坡机理准确分析的基础上,提出了治理工程措施,取得了成功。同时本文对该滑坡多次治理失效进行了反思,该滑坡屡治不愈的根本原因在于没有重视滑坡工程地质勘察,导致对滑坡的变形机理认识不足,尤其是滑动面的埋深判断失误,而且又弱化了地下水对滑坡的作用; 在对滑坡变形机理分析不到位的情况下,盲目实施抗滑工程,导致滑坡多次治理失效。因此应采取必要的工程地质勘测手段,查明滑坡区的工程地质条件和坡体结构,准确分析滑坡的变形机理和发生发展过程是滑坡地质灾害根治的重要前提。

       

      Abstract: Boligou landslide located on the left bank of Boligou of Xuejiawan town, is a traction type landslide composed of landfill soil. Since several treatment measures had failed from 2009 to 2012,the investigations and regulation project for the landslide have to carry on again. This paper analyze the slope structures and deformation mechanism of the Boligou landslide through further exploration research:congenital condition for landslide formation is the natural slope shape changed by man-made; material basis for landslide deformation is special slope structure; inducing factors of landslide deformation are infiltration of surface water, the groundwater, and riverbed silt uplift and landslide slope toe excavation intensified deformation. On the basis of accurate analysis of landslide deformation mechanism, put forward engineering treatment measures and achieved success. At the same time, this paper analyzes the reason for the multiple treatment failure, and the root cause is paying less attention to the engineering geological investigation which leads to insufficient understanding of the deformation mechanism of landslide, especially erroneous judgement to the buried depth of the slip plane and ignoring the effect of groundwater on landslide. Under the condition of insufficient understanding of landslide deformation mechanism, blind implement the anti-sliding engineering resulted in multiple treatment measures failure. Therefore the important premise of radical cure landslide is to find out the engineering geological condition and landslide slope structure, and accurate analysis of the deformation mechanism and development process of the landslide by taking necessary means of engineering geological investigation.

       

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