夏敏, 任光明, 郭亚莎, 吕生弟, 刘荣清. 2010: 地震诱发滑坡复活机制的FLAC3D 数值模拟分析. 工程地质学报, 18(3): 305-311.
    引用本文: 夏敏, 任光明, 郭亚莎, 吕生弟, 刘荣清. 2010: 地震诱发滑坡复活机制的FLAC3D 数值模拟分析. 工程地质学报, 18(3): 305-311.
    XIA Min, REN Guangming, GUO Yasha, LV Shengdi, LIU Rongqing. 2010: FLAC3D NUMERICAL SIMULATION OF RECURRENCE MECHANISM OF LANDSLIDE UNDER EARTHQUAKE LOADING. JOURNAL OF ENGINEERING GEOLOGY, 18(3): 305-311.
    Citation: XIA Min, REN Guangming, GUO Yasha, LV Shengdi, LIU Rongqing. 2010: FLAC3D NUMERICAL SIMULATION OF RECURRENCE MECHANISM OF LANDSLIDE UNDER EARTHQUAKE LOADING. JOURNAL OF ENGINEERING GEOLOGY, 18(3): 305-311.

    地震诱发滑坡复活机制的FLAC3D 数值模拟分析

    FLAC3D NUMERICAL SIMULATION OF RECURRENCE MECHANISM OF LANDSLIDE UNDER EARTHQUAKE LOADING

    • 摘要: 地震是影响斜(边)坡、滑坡稳定性的主要因素之一。白龙江上某大型滑坡经顺层斜坡发生倾倒变形而成,天然状态下处于基本稳定状态,在5.12汶川地震作用下,该滑坡有整体复活迹象,其后缘周界形成了连续贯通的拉裂缝、错动台阶,尤其是滑坡下游区变形拉裂较明显。本文以该滑坡在地震作用下发生复活为例,在分析滑坡所处的区域地质条件的基础上,详细研究了滑坡的基本特征以及地震作用导致滑坡复活的现象、特征,然后利用FLAC3D 软件内置动力分析模块对该滑坡复活机制进行了分析、研究。数值分析表明,地震作用下滑坡变形破坏受坡体形态的影响较显著,滑坡对地震波具有明显的放大效应; 同一地震动条件下,滑坡体相对周边处于稳定状态基岩边坡对地震更为敏感。这较好地解释了5.12汶川地震作用下,该滑坡的复活原因。

       

      Abstract: Earthquake is one of the main factors to affect the stability of slopes or landslides.The huge landslide on Bailongjiang was formed in toppling deformation of the bedding slope. It was in a stable state under natural conditions. After the 5.12 Wenchuan Earthquake,the huge landslide appeared moving phenomena including continuous linking crack and dislocation steps in the trailing edge of landslide. Especially,the rupture deformation of the landslide downstream area tended to be evident.This paper examines the recurrence mechanism of the huge landslide under the earthquake. It is based on the regional geological conditions of landslide. It investigates the basic features in detail and the recurrence phenomenon and the characteristics of landslide. It is accomplished a dynamic analysis of landslide recurrence with the software builtin module FLAC3D. The numerical simulation and analysis show thatthe deformation and damage of the landslide is affected deeply by terrain under earthquake loading. The landslide has an obvious amplification effect under the action of the seismic waves. Compared with the steady rock slope adjacent to the landslide,the landslide was more sensitive to the earthquake loading under the same earthquake magnitude. This result explains well the causes of recurrence of landslide under the 5.12 Wenchuan Earthquake.

       

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