InSAR monitoring of short-term rapid slip in open-pit mine: a case study of tailings reservoir No.2 and 4,Dexing copper mine

doi:10.13474/j.cnki.11-2246.2026.0521

Abstract

Abstract: [Purposes]Tailings reservoir slides and their secondary hazards have become one of the major geological hazards in open-pit mines.Large-scale,short-critical and long-time dynamic monitoring of tailings reservoir landslide hazards is the basis for smart mine construction management and safe exploitation of mineral resources,and is also a powerful guarantee for preventing and warning the occurrence of landslide geological hazards in open-pit mining.[Methods]In this paper,we combine short-critical D-InSAR and long-time sequence PS-InSAR.Based on low-medium resolution Sentinel-1 satellite SAR wide mode images from November 2020 to March 2021,and taking tailings reservoirs No.2 and 4 of Dexing copper mine as the study area,it is used to monitor and analyse the short-time displacement characteristics,long-time displacement trends and influencing factors of the tailings reservoir in terms of slip profiles,PS single point positioning and time-series cumulative slip.Based on the coherence coefficient of SAR image interference,the large-scale slip deformation of tailings reservoir slope is analyzed.[Findings]The monitoring results show that the the tailings reservoir slip is mainly related to the dam elevation gradient and precipitation.Tailings reservoir No.2 slip occurs in the tailings sand reservoir,with a maximum slip rate is -439 mm/a.Tailings reservoir No.4 slip is mainly distributed in the upper half of the dam body,and the slip rate gradually increases from the top of dam to the central drainage channel,with a maximum rate of -619 mm/a.The time series results show that the slip initially starts near the central drainage channel of the dam body,and the maximum cumulative slip is -220 mm.The coherence coefficient method can effectively monitor large-scale slip of tailings reservoir slope.[Conclusions]The results show that the combined InSAR monitoring technique and coherence coefficient method can provide technical support for the large-area,short-period and long time series slip monitoring of the open-pit tailings reservoir.

Key words: tailings reservoir, slip, PS-InSAR, D-InSAR, coherence coefficient, Dexing copper mine

CLC Number:

P237

LU Li, XU Xiaobo, QIN Yousen. InSAR monitoring of short-term rapid slip in open-pit mine: a case study of tailings reservoir No.2 and 4,Dexing copper mine[J]. Bulletin of Surveying and Mapping, 2026, 0(5): 128-135.

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