Dynamic evolution mechanism and subsequent reactivated ancient landslide analyses of the “6.17” Danba sequential disasters

Jiang, Nan; Li, Haibo; Hu, Yuxiang; Dai, Wei; Li, Cong-jiang; Zhou, Jia‐wen

doi:10.1007/s10064-022-02614-1

Cited by 11 publications

(1 citation statement)

References 31 publications

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“…However, little emphasis has been placed on monitoring slope activity for landslides that do not reactivate due to excavation but fail sometime after the completion of construction. Once a reactivated landslide is detected along the road, it is important to investigate its deformation characteristics, reveal the prerequisite and triggering factors, and indicate whether this landslide could reactivate catastrophically and induce devastating aftermath [12][13][14]. Enhanced efforts have been made to understand the characteristics and mechanisms of reactivated landslides, the deformations of which are mainly induced by precipitation, water level fluctuation and anthropogenic activity [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Insights into Deformation and Mechanism of a Reactivated Landslide Occurrence from Multi-Source Data: A Case Study in Li County, China

Du,

He,

et al. 2024

Remote Sensing

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The investigation of reactivated landslides in the alpine-canyon areas suffers the difficult accessibility of precipitous terrain. In particular, when reactivated landslides occur along the major roads, efforts are focused on measuring ground surface displacements during road construction. Nevertheless, the ancient landslide deposits may reactivate after several years of road operation, while they show a stable state during the road construction. The characterization of this type of reactivated landslides is challenging, due to their complex mechanism and the limited monitoring data. Appropriate multi-source data can provide insights into deformation fields and enhance the understanding of landslide mechanisms, ensuring the outperformance of remedial works. This paper reports a recent Tangjiawan reactivated landslide along the Wenchuan-Maerkang Highway in Li County, China. The outcomes, including satellite InSAR, in situ real-time monitoring, and detailed ground and UAV investigation, conducted at this landslide are presented. Early deformation of the reactivated landslide began from 2019, with an InSAR-derived velocity of −11.7 mm/year, furthermore, a significant subsidence of about 21.2 mm, which occurred within a span of only 12 days from 3 June 2020 to 15 June 2020, was observed. The deformation characteristics derived from in situ monitoring during the remedial works were likely firstly associated with the initial unreinforced slope condition and the heavy rainfall. Subsequently, the displacement evolution transformed into deformation induced by time-dependent reduction in slope strength under rainfall conditions. The existing of unconsolidated deposits derived from ancient landslides, along with a fragile geo-structure consisting of rock blocks and gravels interlayered with breccias, exacerbated by large relief created a predisposition for landslide reactivation. Furthermore, 13 days of antecedent cumulative rainfall totaling 224.5 mm directly triggered the occurrence of a landslide event. The significance and implications of integrating multiple monitoring techniques are emphasized.

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