舟曲立节北山高位滑坡变形特征及成因研究

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中图分类号：P642 文献标志码：A 文章编号：1000-0844（2025）06—1303—12

Abstract： The reactivated Lijie North Mountain landslide in Zhouqu County， Gansu Province，has triggered repeated debris flows with ongoing creep deformation， posing significant threats to adjacent villages，roads，and downstream areas.By integrating field investigations，satellite imagery analysis， global navigation satellite system，and micro-deformation radar monitoring，this study reveals the landslide's developmental features， deformation process， evolutionary trend， and genetic mechanism. Results are as follows： （1） The Lijie North Mountain slope exhibits a polyline profile （steep upper/lower sections，gentle midsection， and flat base） with a maximum elevation difference of 1450m ， forming a large high-position colluvial landslide under multifactor coupling.（2） Comprising 1O ancient/recent sliding zones with complex interactions and failure modes，the landslide exhibits a multistage retrogressive failure pattern characterized by sequential bottom-up progression where frontal sliding mechanically destabilizes rear blocks，leading to a headward erosion mechanism.（3） Influenced by tectonic structure，topography，and rainfall，the landslide exhibits an integral instability potential， forming a cascading hazard chain （landslidedebris flow-barrier lake）.Multisource monitoring integrated with landslide characteristics enables an accurate interpretation of the deformation processand a mechanistic analysis，providing a scientific basis for the early warning and mitigation of analogous high-position accumulation landslides.

Keywords： high-position and long-runout landslide; creep deformation; GNSS monitoring; micro deformation radar;genetic mechanism

0 引言

舟曲县白龙江流域地处青藏高原东缘中的高山峡谷区，区内新构造运动活跃，强烈的侵蚀切割作用形成了差异性不协调河谷地貌，岩体结构复杂易碎，软弱岩层发育，流域性大型-巨型高位堆积层滑坡多发，并在发生滑坡时可形成滑坡补给泥石流的灾害链[1-3]。（剩余14535字）