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甘肃岷县永光1#流滑型黄土滑坡的远程滑动特征

吴玮江 王国亚 张国信 冯乐涛 姚正学 宿星

吴玮江,王国亚,张国信,等. 甘肃岷县永光1#流滑型黄土滑坡的远程滑动特征[J]. 中国地质灾害与防治学报,2023,34(6): 1-10 doi: 10.16031/j.cnki.issn.1003-8035.202209046
引用本文: 吴玮江,王国亚,张国信,等. 甘肃岷县永光1#流滑型黄土滑坡的远程滑动特征[J]. 中国地质灾害与防治学报,2023,34(6): 1-10 doi: 10.16031/j.cnki.issn.1003-8035.202209046
WU Weijiang,WANG Guoya,ZHANG Guoxin,et al. Long-runout characteristics of the Yongguang 1# loess flowslide in Minxian County, Gansu Province[J]. The Chinese Journal of Geological Hazard and Control,2023,34(6): 1-10 doi: 10.16031/j.cnki.issn.1003-8035.202209046
Citation: WU Weijiang,WANG Guoya,ZHANG Guoxin,et al. Long-runout characteristics of the Yongguang 1# loess flowslide in Minxian County, Gansu Province[J]. The Chinese Journal of Geological Hazard and Control,2023,34(6): 1-10 doi: 10.16031/j.cnki.issn.1003-8035.202209046

甘肃岷县永光1#流滑型黄土滑坡的远程滑动特征

doi: 10.16031/j.cnki.issn.1003-8035.202209046
基金项目: 国家自然科学基金项目(42067066);甘肃省科学院项目(2022JK-04)
详细信息
    作者简介:

    吴玮江(1963-),男,甘肃天水人,研究员,长期从事地质灾害防治研究。E-mail:wwj0408@163.com

  • 中图分类号: P642.22

Long-runout characteristics of the Yongguang 1# loess flowslide in Minxian County, Gansu Province

  • 摘要: 流滑型黄土滑坡是黄土地区沿沟道或斜坡远程滑动和堆积的长条状特殊类型滑坡,常造成难以预料的严重灾害。2013年7月22日7时45分,甘肃岷县漳县Ms6.6级地震诱发的岷县永光1#滑坡体积约23×104 m3,造成12人遇难。滑坡前后缘高差175 m,总长度1030 m,其比值为0.17,属远程滑坡。通过现场调查和滑动过程观察资料的综合分析,探讨了其滑动过程特征、不同部位的滑速及变化情况,分析了滑动机理。受地震作用促发和地形条件等影响,永光1#滑坡经历了2次加速—减速的复杂滑动过程,滑坡首先在前部平台区整体滑动50~130 m,前缘约6×104 m3滑体再沿前部沟道滑动740 m,最大滑距达870 m,滑动总历时约7 h,最大滑速约10.6 m/s,平均滑速0.034 m/s。永光1#滑坡由地震和前期降水耦合作用形成,地震前大量降水的入渗和软化,滑动过程中高含水率滑带土产生高孔隙水压力,甚至导致液化发生,圈闭的沟道地形和滑带土的低渗透性,使孔隙水压力消散非常缓慢,在全滑程中滑带土摩阻力大幅降低,持速效应明显,是永光1#滑坡远程滑动的主要原因。
  • 图  1  7•22岷县漳县地震烈度与构造背景图

    Figure  1.  Seismic intensity and structural background map of the July 22 earthquake in Minxian-Zhangxian earthquake

    图  2  永光滑坡正射影像图

    Figure  2.  Orthophoto image map of Yongguang landslide

    图  3  永光滑坡平面图

    Figure  3.  Plan view of the Yongguang landslide

    图  4  永光1#滑坡工程地质剖面图

    Figure  4.  Engineering geological cross-section of the Yongguang 1# landslide

    图  5  永光1#滑坡滑源区—平台堆积区

    Figure  5.  Sliding source area of Yongguang 1# landslide:platform accumulation area

    图  6  流通区—沟道堆积区及堰塞湖

    Figure  6.  The sliding body flowing along the channel and barrier lake

    图  7  滑坡前舌及挤压变形的小桥

    Figure  7.  Small bridge at the front lobe of the landslide with extrusion deformation

    图  8  流通区下段与主沟道处滑坡堆积

    Figure  8.  Landslide Deposits in the lower section of the runout zone and the accumulation of sliding body in the main channel

    图  9  流通区滑速计算剖面简图

    Figure  9.  Simplified profile for calculating slide velocity in the runout zone

    图  10  永光1#滑坡滑速分析图

    Figure  10.  Analysis of the sliding speed of the Yongguang 1# landslide

    图  11  2013年岷县降水量曲线

    Figure  11.  The precipitation curve for Minxian County in 2013

    图  12  滑体土动三轴试验曲线图

    Figure  12.  Dynamic triaxial test curve of the sliding soil

    图  13  饱和滑体振动液化现象

    Figure  13.  Vibration-induced liquefaction in the saturated sliding mass

    图  14  主沟道中的饱和滑带与液化现象

    Figure  14.  Saturated sliding zone and liquefaction phenomenon in the main channel

    图  15  沟道中滑带孔隙水压力作用模式图

    Figure  15.  Schematic diagram of pore water pressure in sliding zone of the channel

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  • 收稿日期:  2022-09-29
  • 修回日期:  2022-11-06
  • 网络出版日期:  2023-10-20

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