降雨作用下碎石土滑坡解体变形破坏机制研究  

Study on mechanism of disintegration deformation and failure of debris landslide under rainfall

作　　者：许建聪[1] 尚岳全[2] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]浙江大学建筑工程学院,杭州310027

出　　处：《岩土力学》2008年第1期106-112,118,共8页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(No.40372118)

摘　　要：为了揭示碎石土滑坡的变形解体破坏机制,结合工程实例,通过资料搜集整理和分析、现场工程地质调查与勘探和室内外的物理力学试验,采用不平衡推力法、数理统计分析方法和三维弹塑性接触有限元算法,以及运用碎石土边坡地下水管网状排泄系统理论,分析降雨作用下碎石土滑坡的变形解体破坏过程,揭示了降雨作用下中深层碎石土滑坡变形解体破坏的主要机制和一般的力学机制。结果表明,一定强度的长时间连续降雨或强降雨是中深层碎石土滑坡发生失稳的主要触发因素;采用考虑降雨作用的弹塑性接触有限元算法,可以更好地反映该类型滑坡在降雨作用下所处的实际状态及滑坡的滑动过程,可以为该类型滑坡稳定性的准确评价和预测预报提供可资借鉴的方法。In order to reveal the mechanism of disintegration deformation and failure of debris landslide under rainfall, connected with the engineering concrete example of medium and deep debris landslide, through the collection, arrangement and analysis of related data, the site investigation and exploration of engineering geology, indoor and outdoor physico-mechanical test, adopting the analytic means of mathematic statistics, unbalanced-thrust method and three-dimensional contact elastoplastic FEM together, and the theory of groundwater pipe network drainage system（GPNDS）, its stability and process of the deformation, disintegration and failure under rainfall were analyzed, which the main disintegration deformation and failure mechanism and general mechanics mechanism of medium and deep debris landslide under rainfall are revealed. The research result shows as follows： First, long time proper strength steady rain or intensive rainfall is the main factor of its instability and failure. Second, adopting contact elastoplastic FEM thinking over the action of rainfall may better reflect the actual locating state and sliding process of debris landslide under rainfall; and it may afford one method that can be used as a reference of stability analysis, accurate evaluation and forecast of the debris landslide.

关 键 词：工程地质 碎石土滑坡 弹塑性有限元 接触算法 解体破坏 

分 类 号：TU457[建筑科学—岩土工程]