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岷县漳县6.6级地震永光村滑坡致灾机制分析

吴志坚, 陈豫津, 王谦, 赵多银, 张丹

吴志坚, 陈豫津, 王谦, 赵多银, 张丹. 岷县漳县6.6级地震永光村滑坡致灾机制分析[J]. 岩土工程学报, 2019, 41(S2): 165-168. DOI: 10.11779/CJGE2019S2042
引用本文: 吴志坚, 陈豫津, 王谦, 赵多银, 张丹. 岷县漳县6.6级地震永光村滑坡致灾机制分析[J]. 岩土工程学报, 2019, 41(S2): 165-168. DOI: 10.11779/CJGE2019S2042
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WU Zhi-jian, CHEN Yu-jin, WANG Qian, ZHAO Duo-yin, ZHANG Dan. Disaster-causing mechanism of Yongguang landslide under Minxian-Zhangxian Ms6.6 Earthquake[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(S2): 165-168. DOI: 10.11779/CJGE2019S2042
Citation: WU Zhi-jian, CHEN Yu-jin, WANG Qian, ZHAO Duo-yin, ZHANG Dan. Disaster-causing mechanism of Yongguang landslide under Minxian-Zhangxian Ms6.6 Earthquake[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(S2): 165-168. DOI: 10.11779/CJGE2019S2042
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岷县漳县6.6级地震永光村滑坡致灾机制分析  English Version

  • 1. 南京工业大学交通运输工程学院,江苏 南京 210009;
    2. 中国地震局黄土地震工程重点实验室,甘肃 兰州 730000;
    3. 甘肃省科学院,甘肃 兰州 730000;
    4.兰州交通大学,甘肃 兰州 730000

基金项目: 国家自然科学基金项目（41472297）; 南京工业大学引进人才科研启动费项目（39831115）
详细信息
    作者简介:

    吴志坚(1974— ),男,安徽安庆人,博士,教授,主要从事岩土地震工程与冻土工程领域的研究。E-mail: zhijianlz@163.com。

Disaster-causing mechanism of Yongguang landslide under Minxian-Zhangxian Ms6.6 Earthquake

  • 1. College of Transportation Science & Engineering, Nanjing Tech University, Nanjing 210009, China;
    2. Key Laboratory of Loess Earthquake Engineering, China Earthquake Administration, Lanzhou 73000, China;
    3. Gansu Academy of Sciences, Lanzhou 730070, China;
    4. Lanzhou Jiaotong University, Lanzhou 730070, China

摘要

    摘要
  • 摘要: 2013年7月22日甘肃省定西市岷县漳县MS6.6级地震,诱发了大量黄土滑坡和崩塌灾害。基于对岷县梅川镇永光村西侧泥流状黄土滑坡的现场勘察、探井取样和高密度面波勘探,得到了该滑坡的地形条件和土层分布特点。通过对滑坡体土样进行室内动三轴液化试验,验证了该滑坡土体在地震作用下发生液化的可能。结合动力有限元法和强度折减法,分析了该滑坡在地震作用下的动力响应特征和动力稳定性的影响因素。结果表明：震前的持续强降雨,导致滑坡体表层黄土含水率升高,抗剪强度降低,在强地震荷载作用下,黄土层之间存在拉应力效应,表层土体发生液化,造成该斜坡失稳瞬间发生,发生长距离滑移。
    Abstract: The Minxian-Zhangxian MS6.6 earthquake induced a large number of loess landslides and collapses on July 22, 2013. Based on the field borehole survey, soil sampling and surface wave investigation, the topography and distribution of soil layers of the west Yongguang loess landslide are identified. Moreover, the liquefaction probability of the landslide loess is proven through dynamic triaxial liquefaction tests. The dynamic response characteristics and stability influence factors of the landslide under strong earthquake effect are analyzed combining the dynamic finite element method and the strength reduction method. The results show that the water content increases and shear strength decreases at the loess on the slope surface because of heavy rain before the earthquake, and tensile stress and liquefaction occur in the surface of loess slope, which causes the collapse instantaneously and long sliding distance.
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    • 参考文献(5)
  • [1] 王兰民, 吴志坚. 岷县漳县6.6级地震震害特征及其启示[J]. 地震工程学报, 2013, 35(3): 401-412.
    (WANG Lan-min, WU Zhi-jian.Earthuake damage characteristics of the Minxian-Zhangxian Ms6.6 Earthquake and Its lessons[J]. China Earthquake Engineering Journal, 2013, 35(3): 401-412. (in Chinese))
    [2] 袁中夏, 王兰民, 王平. 黄土液化机理和判别标准的再研究[J]. 地震工程和工程振动, 2004, 24(4): 164-168.
    (YUAN Zhong-xia, WANG Lan-min, WANG Ping.Further study on mechanism and discrimination criterion of loess liquefaction[J]. Earthquake Engineering and Engineering Vibration, 2004, 24(4): 164-168. (in Chinese))
    [3] 李荣建, 郑文, 王莉平, 等. 非饱和土边坡稳定性分析方法研究进展[J]. 西北地震学报, 2011, 33(增刊1): 2-9.
    (LI Rong-jian, ZHENG Wen, WANG Li-ping, et al.Progress and developing trend on stability analyses of unsaturated soil slope[J]. Northwestern Srtsmolocttal Journal, 2011, 33(S1): 2-9. (in Chinese))
    [4] 车爱兰, 吴志坚, 彭冬, 等. 黄土斜坡震害面波勘探调查及其动力稳定性分析—以甘肃岷县、漳县Ms6.6地震为例[J]. 地震工程学报, 2013, 35(4): 724-729.
    (CHE Ai-lan, WU Zhi-jian, PENG Dong, et al.Surface wave investigation and dynamic stability analysis for earthquake-induced loess landslides[J]. China Earthquake Engineering Journal, 2013, 35(4): 724-729. (in Chinese))
    [5] 林杭, 熊威, 李正明. 边坡剪应变滑动面程序嵌入及参数分析[J]. 岩土工程学报, 2013, 35(增刊1): 52-56.
    (LIN Hang, XIONG Wei, LI Zheng-ming.Embedded program for slip surface by shear strain of slopes and parametric analysis[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(S1): 52-56. (in Chinese))
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出版历程
  • 收稿日期:  2019-04-27
  • 发布日期:  2019-07-19

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