2023年积石山地震诱发金田-草滩村滑坡滑动过程与成因机理研究
作者:
作者单位:

1.中国地震局兰州地震研究所;2.青海省地震局

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基金项目:

青海省重点研发与转化项目(2022-SF-138);国家自然科学(42172227)。


Sliding process and causative mechanisms of the Jintian-Caotan landslide-mudflow hazard chain induced by the 2023 Jishishan Earthquake
Author:
Affiliation:

1.China Earthquake Administration Lanzhou Institute of Seismology,Lanzhou;2.Qinghai Earthquake Agency

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    摘要:

    北京时间2023年12月18日23时59分,甘肃省积石山县发生Ms6.2地震。该地震在青海省民和回族土族自治县中川乡草滩村引发了一次严重的滑坡-泥流灾害事件。本研究通过详细的地质调查、低空摄影测量技术、现场工程地质测绘以及含水率实验等手段,对该滑坡的基本特征、滑坡动态发展过程及其成灾原因进行了调查分析。研究结果显示,此次滑坡事件经历了分级和分块启动,随着不同块体的逐渐演变,共经历6个主要滑动阶段,呈现出渐退式的滑移特征。分析认为,滑坡的原因如下:村民长期灌溉活动导致地下形成了饱水黄土层,在地震作用下,这些饱水黄土层的孔隙水压力急剧增加,导致黄土液化,随后,液化的饱水黄土层携带着上覆的非饱和土层迅速向沟道滑移。此外,滑坡体与地下涌出的泉水及水渠中不断的补给水混合,进一步加剧了滑坡-泥流灾害的形成。研究区域附近多分布类似的灌溉区,因此在未来地震发生时,对这类滑坡事件的预防与治理将成为重要的研究方向。

    Abstract:

    At 23:59 on December 18, 2023, a magnitude Ms6.2 earthquake occurred in Jishishan County, Gansu Province. This earthquake triggered a severe landslide-debris flow disaster in Caotan Village, Zhongchuan Town, Minhe County, Qinghai Province. Based on the detailed geological survey, low-altitude photogrammetry, onsite engineering geology mapping, and soil water content experiments, basic characteristics, dynamic development process, as well as causes of the landslide disaster were investigated and analyzed. The results suggest that the landslide initiated in a phased and block-wise manner, undergoing six significant sliding stages. This progression exhibits a characteristic of progressively retreating slip. The analysis suggests that the landslide was predominantly attributed to such composite factors: prolonged irrigation activities undertaken by local inhabitants culminated in the establishment of saturated loess layers beneath the surface. Subsequent to the strong earthquake shaking, the pore water pressure within these saturated loess layers experienced a rapid escalation, inducing a state of liquefaction in the loess.

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  • 收稿日期:2024-01-13
  • 最后修改日期:2024-01-25
  • 录用日期:2024-01-31
  • 在线发布日期: 2024-01-31