李世贵, 黄达, 石林, 王俊杰. 2018: 基于极限应变判据-动态局部强度折减的边坡破坏演化数值模拟. 工程地质学报, 26(5): 1227-1236. DOI: 10.13544/j.cnki.jeg.2018-088
    引用本文: 李世贵, 黄达, 石林, 王俊杰. 2018: 基于极限应变判据-动态局部强度折减的边坡破坏演化数值模拟. 工程地质学报, 26(5): 1227-1236. DOI: 10.13544/j.cnki.jeg.2018-088
    LI Shigui, HUANG Da, SHI Lin, WANG Junjie. 2018: NUMERICAL MODELING OF THE EVOLUTION OF SLOPE FAILURE USING THE LIMIT STRAIN CRITERION AND DYNAMIC STRENGTH REDUCTION METHOD. JOURNAL OF ENGINEERING GEOLOGY, 26(5): 1227-1236. DOI: 10.13544/j.cnki.jeg.2018-088
    Citation: LI Shigui, HUANG Da, SHI Lin, WANG Junjie. 2018: NUMERICAL MODELING OF THE EVOLUTION OF SLOPE FAILURE USING THE LIMIT STRAIN CRITERION AND DYNAMIC STRENGTH REDUCTION METHOD. JOURNAL OF ENGINEERING GEOLOGY, 26(5): 1227-1236. DOI: 10.13544/j.cnki.jeg.2018-088

    基于极限应变判据-动态局部强度折减的边坡破坏演化数值模拟

    NUMERICAL MODELING OF THE EVOLUTION OF SLOPE FAILURE USING THE LIMIT STRAIN CRITERION AND DYNAMIC STRENGTH REDUCTION METHOD

    • 摘要: 岩土材料具有极限应变特征,其值可以通过室内试验或数值模拟方法求得。边坡岩土体主要为剪切破坏,可采用极限剪应变作为材料破坏的判据。事实上,边坡岩土体强度参数劣化并非整体性的,而是一个渐进性局部损伤至整体失稳的过程。本文基于极限应变判据,建立了边坡破坏的动态局部强度折减方法,此方法对边坡中超过极限剪应变值的单元进行强度折减。通过不断折减计算过程中产生的超过极限剪应变值单元,直到坡内超过极限剪应变值的单元贯通,认为边坡整体发生破坏。将该方法应用到实际边坡工程中,计算结果和边坡破坏模式及变形监测数据基本吻合。此方法在分析边坡渐进性破坏及稳定性评价方面具有较好应用前景。

       

      Abstract: Geo-materials usually possess the characteristics of limit strain, which can be obtained by laboratory or numerical method. Shear failure is one of the main failure mode of the materials in slope, thus the limit strain of slope material can be used as a failure criteria. In fact, during the failure process of slope, the strength parameters of geo-materials in slope do not degrade simultaneously. Instead, they usually progressively damage until global failure. In this study, regarding slope failure we proposed a dynamic strength reduction method based on the limit shear strain criterion. In this method, we only reduce the strength parameters of elements whose shear strain is beyond the limit value. The reduction process will continue until the global slope failure associated with the formation of whole sliding surface whose limit shear strains beyond the limit value. A numerical modeling of an actual slope using this method is conducted. Results show that the simulated slope failure pattern and deformation are in good agreement with the in-situ observed failure phenomenon and monitoring data, respectively. This suggests that the proposed numerical method has a promising application prospect in studying the progressive failure and stability of slopes.

       

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