1.防灾科技学院,河北 三河 065201
2.青海省地震局,青海 西宁 810001
常晁瑜(1990—),男,副教授,博士。主要从事岩土工程研究。E-mail:changchaoyu@126.com
乔峰(1990—),男,副教授,博士。主要从事岩土工程研究。E-mail:qiaofengCT@163.com
收稿:2024-01-31,
修回:2024-03-30,
纸质出版:2025-04-28
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常晁瑜,乔峰,薄景山等.甘肃积石山6.2级地震诱发中川乡流滑成因初探[J].防灾减灾工程学报,2025,45(02):349-356.
CHANG Chaoyu,QIAO Feng,BO jingshan,et al.A Preliminary Study on Causes of Flowslide in Zhongchuan Township Triggered by M6.2 Jishishan Earthquake in Gansu Province[J].Journal of Disaster Prevention and Mitigation Engineering,2025,45(02):349-356.
常晁瑜,乔峰,薄景山等.甘肃积石山6.2级地震诱发中川乡流滑成因初探[J].防灾减灾工程学报,2025,45(02):349-356. DOI: 10.13409/j.cnki.jdpme.20240131003.
CHANG Chaoyu,QIAO Feng,BO jingshan,et al.A Preliminary Study on Causes of Flowslide in Zhongchuan Township Triggered by M6.2 Jishishan Earthquake in Gansu Province[J].Journal of Disaster Prevention and Mitigation Engineering,2025,45(02):349-356. DOI: 10.13409/j.cnki.jdpme.20240131003.
2023年12月18日,甘肃临夏州积石山县6.2级地震触发了一种不同于传统滑坡的特殊流滑地质灾害。目前,这类灾害的成因与机理尚不清晰,前期识别仍存在一定困难。该研究对中川乡流滑进行了详细调查和分析,对于此类灾害的防范具有重要的理论和现实意义。此次积石山地震所诱发的地质灾害具有低角度黄土斜坡流滑的特征,滑动距离较长,堆积区涌出浓稠泥浆,导致大量房屋掩埋,20人失踪。通过现场详细的考察和分析,探讨了流滑的成因、运移特征以及涌动速度。调查结果表明:(1)此次灾害发生于黄河的三级和二级阶地上,上下高差79.2 m,滑动距离约3.1 km,总体坡度仅1.5°,属于强震诱发低角度黄土斜坡流滑。(2)本次流滑成因初步可以归纳为连续灌溉导致滑源土体高度饱水、强烈地震触发欠固结饱和黄土的结构性丧失、低塑性指数黄土发生流动破坏以及路基溃坝和冲沟变窄增强破坏。
On December 18
2023
a 6.2 magnitude earthquake in Jishishan County
Linxia Prefecture
Gansu Province triggered a special flowslide
which differed significantly from conventional landslides. Currently
the causes and mechanisms of such disasters are unclear
and their early identification remains challenging. This study conducted detailed field investigation and analysis of the Zhongchuan Township flowslide
which could provide important theoretical and practical implications for preventing such disasters. The geological disaster triggered by the Jishishan earthquake was a low-angle loess slope flowslide
with a long sliding distance and viscous mud outbursts in the accumulation area
submerging multiple houses and leaving 20 people missing. Through in-depth field investigation and analyses
the causes
movement patterns
and surge velocities of the flowslide were explored. The results showed that: (1) the flowslide occurred on the second and third terraces of the Yellow River
with an elevation difference of 79.2 m
a sliding distance of approximately 3.1 km
and an overall slope angle of merely 1.5°. This event was identified as a low-angle loess slope flowslide triggered by a strong earthquake. (2) The primary causes of the flowslide included high saturation of source loess induced by continuous irrigation
structural collapse of under-consolidated saturated loess triggered by a strong earthquake
flow failure of low-plasticity-index loess
and enhanced damage due to embankment failure and gully constriction.
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