LANDSLIDE STABILITY ANALYSIS BY THE 3D ELASTIC PLASTIC CONTACT FINITE ELEMENT ALGORITHM
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摘要: 为了准确评价碎石土滑坡的稳定性,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,采用三维弹塑性接触有限元算法计算碎石土滑坡的整体稳定性系数和分析滑坡的稳定性。研究结果表明,采用三维弹塑性接触有限元强度折减法计算碎石土滑坡的稳定性系数,可以考虑滑坡体的空间效应,使计算结果更加精确;在碎石土滑坡变形解体破坏过程中,在空间上滑体塑性应变和滑面上岩土体抗剪强度的发挥程度是不一致的;根据三维弹塑性接触有限元算法计算的滑面接触摩擦应力计算二维剖面碎石土滑坡稳定性系数的方法比较适宜于该类型滑坡稳定性的分析评价,能够比较客观、准确地反映滑坡所处的实际状态。Abstract: In order to evaluate accurately the stability of slopes of rock debris and soil,the integral stability coefficient of a debris and soil landslide was computed and its stability was analyzed through the data collection,arrangement and analysis,site engineering-geological investigation and exploration and indoor and outdoor physical mechanics tests and by adopting the 3D contact elastic-plastic FEM algorithm.When using the 3D elastic-plastic contact FEM strength reduction method to compute the stability coefficient of debris-soil landslides,the space effect of the sliding mass may be considered in order the calculation results to be more accurate.During the deformation,disintegration and failure of debris-soil landslides,in space the plastic strain of the sliding mass and shear strength of the rock or soil mass on a sliding plane are different.The method for computing the stability coefficient of the debris-soil landslide of a 2D section by extracting the contact frictional stress on the sliding surface on the basis of the computation result by the 3D elastic-plastic contact FEM algorithm is relatively suited to the stability analysis and evaluation of this type of landslide and can reflect the actual state of the landslide relatively objectively and accurately.
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