Abstract
With the aggravation of climate warming, unstable soil slopes are more and more common in permafrost regions. The long-term monitoring of a slow earthflow (K178 + 530 landslide) in the Xiao Xing’an Mountains permafrost area in Northeast China was carried out. The deformation characteristics and occurrence mechanism of the landslide were studied using field investigation, on-site drilling, sensor monitoring, laboratory test, Google satellite image, unmanned aerial vehicle photogrammetry, and high-density resistivity. To analyze the variation laws of pore water pressure and effective stress and their influence on slope deformation, a coupled hydro-thermo-mechanical model was established to reconstruct the deformation process of the slope. The results show that the groundwater recharge from the permafrost degradation and surface infiltration reduces the soil cohesion and internal friction angle near the main scarp and increases the soil gravity, thus providing dynamic and mechanical conditions for slope deformation. The melting of the continuous segregation ice in the active layer and surface infiltration reduces the soil strength of the sliding surface and provides deformation conditions for the start of the landslide. The combination of these two factors finally led to the occurrence of the landslide. According to its deformation mechanism, it can be judged that the landslide is a thrust-type landslide. In addition, after the melting of the segregation ice, the upper soil slides along the slope under the action of gravity, causing the sliding surface to be parallel to the slope surface. The soil near the main scarp slides downward and accumulates near the toe to form several transverse ridges. The instability of the transverse ridges produces secondary sliding which causes the toe to advance continuously. The numerical simulation results can intuitively reflect the stage deformation characteristics of the slope, pore water pressure changes, and effective stress distributions, which provides a supplement for further understanding the formation mechanism and deformation process of the landslide.
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All the data used in this study are available from the corresponding author upon request.
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Acknowledgements
We thank the Field scientific observation and research station of the Ministry of Education-Geological environment system of permafrost area in Northeast China (MEORS-PGSNEC) for its help.
Funding
This work was supported by the National Natural Science Foundation of China (Grant No. 41641024) and the Science and Technology Project of Heilongjiang Communications Investment Group (Grant No. JT-100000-ZC-FW-2021-0182).
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Conceptualization: WS; Writing-original draft preparation: MM, WS; Writing-review and editing: WS, MM, CZ and YG; Visualization: MM and WS; Supervision: WS; Project administration: WS; Funding acquisition: WS; All authors have read and agreed to the published version of the manuscript.
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Zhang, C., Ma, M., Shan, W. et al. Process and numerical simulation of landslide sliding caused by permafrost degradation and seasonal precipitation. Nat Hazards 120, 5429–5458 (2024). https://doi.org/10.1007/s11069-024-06433-3
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DOI: https://doi.org/10.1007/s11069-024-06433-3