关键词: 稳定性评价;预警分析;信息分解;双树复小波;尖点突变理论;V/S分析;八字门滑坡;三峡库区;

Abstract: In order to realize the landslide stability evaluation and early warning classification, taking the Bazimen landslide in the Three Gorges Reservoir area as an example, this paper first uses double tree complex wavelet to realize the decomposition of landslide deformation information, so as to eliminate the error information of landslide deformation data and ensure the accuracy of subsequent analysis data.Secondly, it uses the cusp catastrophe theory to realize the evaluation of landslide stability.Finally, it uses the limit displacement criterion and V/S analysis to achieve the status of landslide early warning and late warning.The case analysis results shows that the landslide deformation data does contain a certain amount of error information, which has a great influence on the landslide stability evaluation and early warning analysis.Double tree complex wavelet can effectively separate the useful information and error information of landslide deformation, but in the process of information decomposition, we should pay attention to parameter optimization and selection to ensure the separation effect.The current situation of the Bazimen landslide is in a stable state, and the stability at the rear part of landslide is relatively stronger, and the stability at front is relatively weaker.In terms of early warning analysis, it is known that the early warning level of the status quo of the Bazimen landslide is grade III,and its late warning shows that its deformation will continue to increase.Therefore, it is suggested that the landslide should be monitored at a high frequency, and the avoidance measures should be prepared to ensure the safety of life and property of residents in the region.

Key words: stability evaluation; early warning analysis; information decomposition; double tree complex wavelet; cusp catastrophe theory; V/S analysis; Bazimen landslide; Three Gorges Reservoir area;