Volume 20 Issue 3
Jun.  2012
Turn off MathJax
Article Contents
LU Gongda, YAN Echuan, ZHAO Jianjun, JIANG Shenglai. 2012: FAILURE MECHANISM OF PREFERRED STRUCTURE PLANE CONTROLLED LITHOLOGIC SLOPE DURING INTENSIVE EARTHQUAKE. JOURNAL OF ENGINEERING GEOLOGY, 20(3): 305-310.
Citation: LU Gongda, YAN Echuan, ZHAO Jianjun, JIANG Shenglai. 2012: FAILURE MECHANISM OF PREFERRED STRUCTURE PLANE CONTROLLED LITHOLOGIC SLOPE DURING INTENSIVE EARTHQUAKE. JOURNAL OF ENGINEERING GEOLOGY, 20(3): 305-310.

FAILURE MECHANISM OF PREFERRED STRUCTURE PLANE CONTROLLED LITHOLOGIC SLOPE DURING INTENSIVE EARTHQUAKE

  • Received Date: 2012-01-20
  • Rev Recd Date: 2012-04-12
  • Publish Date: 2012-06-25
  • According to statistics, the damage caused by earthquake-induced landslides and collapses can account for about 40% of all that causes by earthquake. As for the mechanisms and modes of slope deformation and failure under seismic force,a lot of previous theories and achievements have been reached. But, numerical simulation research is limited. The seismic intensity of the northern mountainous area of Shifang City, Sichuan province reached 11 degrees during the 5.12 Wenchuan earthquake. The remote sensing system had interpreted up to 161 sites of geological hazards induced by that. Their basic failure modes are bedding-layer cutting slides and slipping collapses. This paper considered two typical geo-hazards triggered by the 5.12 Wenchuan earthquake, and analyzed their stereographic projection. it worked out the combination modes of preferred structure planes which controlled the slope stability. Then it applied numerical simulation with discrete elements software to simulate their process of failure. The results show the following two failure modes. The first mode of slope failure during earthquake is that, the layered slopes that dip gently outwards crack its top at first, meanwhile the structure planes inside the slope start to undergo shear deformation. As the cracks on the top extend downwards and when these cracks reach the structure planes dip outwards inside the slope, the entire slope will slide along those connected planes. Their deformation and failure mechanism is slide-rip. Their mode of failure is bedding-layer cutting slide. The second mode of slope failure during earthquake is as follows. The steep block slopes crack their tops and loose themselves at first. Then the blocks cut and formed by structure planes start to undergo shear deformation along the structure planes which dip gently inwards or horizontal at the bottom of those tensile cracks. Then these blocks gradually slip outwards due to the durative earthquake, roll and fall down the slopes. Their deformation and failure mechanism is rip-slip. Their mode of failure is slipping collapse.
  • loading
  • [1] 罗国煜, 王培清,吴浩,等.敷溪口松动变形边坡稳定性和破坏机制浅析[J].湖南水利, 1981,(1): 12~16.
    Luo Guoyu, Wang Peiqing, Wu Hao, et al. Brief analysis on stablity and failure mechanism of loose and deformed slope in Fuxikou hydropower station. Hunan Hydro & Power, 1981,(1): 12~16.
    [2] 蒋建平, 章杨松,罗国煜,等.优势结构面理论在岩土工程中的应用[J].水利学报, 2008, 8 : 90~96.
    Jiang Jianping, Zhang Yangsong, Luo Guoyu, et al. The application of preferred plane theory to geotechnical engineering practice. Journal of Hydraulic Engineering, 2008, 8 : 90~96.
    [3] 薛守义. 岩体边坡动力性研究 .北京: 中国科学技术大学, 1989.
    Xue Shouyi. Research on Characteristics of Lithologic Slope under Seismic Condition. Beijing: University of Science and Technology of China, 1989.
    [4] 王存玉, 王思敬.地震条件下二滩水库岸坡稳定性研究 .岩体工程地质力学问题(七) .北京: 科学出版社, 1987.
    Wang Cunyu, Wang Sijing. Study on stability of the bank slope of Ertan reservoir under seismic condition. In: Problem of Rockmass Engineering Geomechanics, Vol.Ⅶ. Beijing: Science Press, 1987.
    [5] 孔纪名, 阿发友,吴文平.汶川地震滑坡类型及典型实例分析[J].水土保持学报, 2009, 23 (6): 66~70.
    Kong Jiming, A Fayou, Wu Wenping. Typical examples analysis and the types of Wenchuan earthquake landslide. Journal of Soil and Water Conservation, 2009, 23 (6): 66~70.
    [6] 许强, 裴向军,黄润秋,等.汶川地震大型滑坡动力过程[M].北京: 科学出版社, 2008.
    Xu Qiang, Pei Xiangjun, Huang Runqiu, et al. Large-scale Landslides Induced by the Wenchuan Earthquake. Beijing: Science Press, 2009.
    [7] 许向宁. 高地震烈度区山体变形破裂机制地质分析与地质力学模拟研究 .成都: 成都理工大学, 2006.
    Xu Xiangning. Geological Analysis and Geomechanics Analog Study of Mountain Deformation Failure Mechanism in High Earthquake Intensity Area. Chengdu: Chengdu University of Technology, 2006.
    [8] 刘同庆, 陈有明,褚进海,等.四川什邡北部山区遥感调查次生地质害现状及防治建议[J].安徽地质, 2008. 18 (4): 284~286.
    Liu Tongqing, Chen Youming, Chu Jinhai, et al. Current situation and prevention recommendations for the secondary geological disasters with the remote sensing survey in the northern mountainous areas of Shifang city, Sichuan province. Geology of Anhui, 2008. 18 (4): 284~286.
    [9] 黄润秋, 裴向军,李天斌.汶川地震触发大光包巨型滑坡基本特征及形成机理分析[J].工程地质学报, 2008, 16 (6): 730~741.
    Huang Runqiu, Pei Xiangjun, Li Tianbin. Basic characteristics and formation mechanism of the largest scale landslide at Daguangbao occurred during the Wenchuan earthquake. Journal of Engineering Geology, 2008, 16 (6): 730~741.
    [10] 殷跃平. 汶川八级地震地质灾害研究[J].工程地质学报, 2008, 16 (4): 433~444.
    Yin Yueping. Research on the geo-hazards triggered by Wenchuan earthquake, Sichuan. Journal of Engineering Geology, 2008, 16 (4): 433~444.
  • 加载中

Catalog

    通讯作者: 陈斌, bchen63@163.com
    • 1. 

      沈阳化工大学材料科学与工程学院 沈阳 110142

    1. 本站搜索
    2. 百度学术搜索
    3. 万方数据库搜索
    4. CNKI搜索
    Article views (3488) PDF downloads(949) Cited by()
    Proportional views
    Related

    /

    DownLoad:  Full-Size Img  PowerPoint