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Huangtupo landslide stability under water level fluctuations of the Three Gorges reservoir

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Abstract

The Huangtupo riverside slope, which extends an area of 1.35 × 106 m2 and has a total volume of 6.934 × 107 m3, is one of the most noted large-scale landslides with great concern about the safety of immigrants in the Three Gorges reservoir area of China. During the normal operation, the reservoir water level fluctuates periodically. Water level fluctuation will soften the strength of the geologic materials on the banks, induce underground water fluctuation, and in turn affect the slope stability. On the basis of the thorough engineering geological survey, the analysis of engineering geological conditions and deformation mechanism is conducted primarily. Then, the Huangtupo landslide is divided into four minor landslides, all of which have typical three-dimensional characteristics. To these landslides, a three-dimensional rigorous limit equilibrium method is proposed, which can accommodate failure surfaces of any shape, and satisfies all the equilibrium conditions. In terms of the strength parameters of geologic materials, the stability evolution of the four minor landslides at the Huangtupo landslide under periodical water level fluctuation is investigated in detail. From the results, the 3D safety factors turned out to be somewhat bigger than the 2D results even though they displayed the same trends. The differences between 2D and 3D results are about 2.92–6.11 %. The maximum reduction in safety factors with the rapid down of water level is 0.11. It is suggested that the safety margin of the two minor landslides near the riverside is insufficient and might become instable under periodical water level fluctuation.

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Acknowledgments

This study is also supported by the National Basic Research Program of China (973 Program), under the Grant No. 2011CB013505 and No. 2014CB047100.

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Correspondence to Hong Zheng.

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Supported by National Natural Science Foundation of China (Grant Nos : 11202223 & 11572009).

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Sun, G., Zheng, H., Tang, H. et al. Huangtupo landslide stability under water level fluctuations of the Three Gorges reservoir. Landslides 13, 1167–1179 (2016). https://doi.org/10.1007/s10346-015-0637-7

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  • DOI: https://doi.org/10.1007/s10346-015-0637-7

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