Analysis on characteristics and reactivation mechanism of secondary landslides in the front part of the Xijitan giant landslide, Guide Basin
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摘要:
黄河上游地区位于构造活动剧烈的青藏高原东北缘，其复杂的地质条件孕育了大量的滑坡、崩塌等地质灾害。文章以青海省贵德县尕让乡江拉新村北席芨滩巨型滑坡前缘次级滑坡为研究对象，采用无人机航测、InSAR地表位移监测、现场调查和室内力学试验等手段，详细分析了滑坡的地质背景、发育特征和复活机制。现场调查发现：滑坡区岩体结构破碎疏松，主要出露地层岩性为新近系泥岩和全新统坡积物；次级滑坡后缘发育多条大型裂缝和张拉带，地表变形明显，处于蠕滑变形阶段；密集发育的结构面对次级滑坡的复活起到控制作用，集中降雨导致的泥岩软化是诱发滑坡复活的关键因素，二者的互馈作用会持续降低滑坡区岩体的完整度和强度，导致次级滑坡的变形复活。研究结果可为黄河上游地区防灾减灾工作提供理论基础。
Abstract:The upper reaches of the Yellow River, located on the northeastern edge of the tectonically active Qinghai Tibet Plateau, are characterized by complex geological conditions that have led to a high incidence of geological disasters such as landslides and collapses. This study focuses on the secondary landslide at the front part of the Xijitan landslide on the north side in Jiangla Village, Garang Township, Guide County, Qinghai Province. Using methods including unmanned aerial vehicle surveying, InSAR surface displacement monitoring, and on-site investigation methods, a detailed analysis of the geological environmental conditions, development characteristics, and reactivation mechanism of the landslide are conducted. On-site investigation results indicate that the rock mass structure in the landslide area is fragmented, with concentrated rainfall. The main exposed strata are Neogene mudstone and Holocene slope deposits. Multiple large cracks and tension bands are developed at the rear edge of the landslide, and the surface deformation is obvious, in the stage of creep deformation. Analysis of the mechanism of landslide reactivation reveals that densely developed structures play a controlling role in the reactivation of secondary landslides, and the softening of mudstone caused by concentrated rainfall is a key factor in inducing landslide reactivation. The interaction between two factors continuously reduce the integrity and strength of the rock mass, leading to the deformation and reactivation of secondary landslides. The research results aim to provide a theoretical basis for disaster prevention and reduction work in the upper reaches of the Yellow River.
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表 1 泥岩峰值强度和残余强度拟合参数
Table 1. Fitting parameters for peak strength and residual strength of mudstone
a b R2 峰值强度 3.028 ± 0.479 7.835 ± 0.656 0.9523 残余强度 3.663 ± 0.209 1.517 ± 0.287 0.9935 
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