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Double-parameter threshold and its formation mechanism of the colluvial landslide: Xintan landslide, China

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Environmental Geology

Abstract

Data compiled from monitoring the displacement resulting from the Xintan landslide in China was analyzed. The stability of the demonstrated colluvial slope has a close correlation with two parameters, the velocity of the displacement and the angle of the surface vector. The stability trend can be described and evaluated by both the velocity of the displacement and the vector angles. The displacement vector angle, for which there is no substitute, serves as an explicit criterion for the stability of the slope, hence it is significant in the prediction of the catastrophic movement of landslides. A systematic analysis of the features of the vector angles of the surface displacement space and time was performed. The evolving mechanism of space-time and the characteristics of the displacement vector angles were deduced. On the basis of these deductions and by using principles of statistics, the double-parameter threshold for forecasting the stability of the colluvial slopes was established. According to the double-parameter threshold, a calculation and evaluation of stability was completed in terms of the monitoring data of the F-series of points on the Xintan slope. The forecast results coincided with the destabilized timetable, thus demonstrating that the double-parameter criterion has, to a certain extent, precision and practical application for forecasting of landslides.

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Acknowledgments

The study was supported by National Natural Science Foundation of China (40472141) and National Science Foundation of Shandong Province (Y2003E01). The authors would like to offer great thanks to Prof. Sun Guangzhou, Institute of Geology, Chinese Academy of Science, and Prof. Li Tiehan, China University of Geosciences, Beijing, for supplying the practical monitoring data of the Xintan slope. Postgraduates Wang Ronglu, Liuyan and Taojin have done much significant work on the monitoring and data analysis for this study.

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Correspondence to He Keqiang.

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Keqiang, H., Sijing, W. Double-parameter threshold and its formation mechanism of the colluvial landslide: Xintan landslide, China. Environ Geol 49, 696–707 (2006). https://doi.org/10.1007/s00254-005-0108-x

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  • DOI: https://doi.org/10.1007/s00254-005-0108-x

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