Deformation Monitoring and Prediction of a Reservoir Landslide in Sichuan Province, China

Abstract:

Hydropower reservoirs change the local geo-environment greatly and often induce reservoir bank landslides. Hongyanzi landslide is a large rejuvenated ancient landslide in Pubugou Hydropower Station reservoir area in western China Sichuan Province. To study the deformation of the Hongyanzi landslide, we arranged multi-parameter monitoring using GPS, fixed borehole tilt-meter, osmometer, and crack-meter and collected continuous data of displacement and ground water table. The monitoring data, together with the reservoir water level data, show that the landslide deforms obviously during reservoir water level is falling, while it deforms little in the other period. Comprehensive analysis of the deformation and reservoir water level implies that the seepage force caused by water level difference between the inner and outer slope may be the key factor. Through regression analysis, the authors established a forecast model for landslide deformation based on ground water table and reservoir water level; thus concluded that reducing the falling velocity of reservoir water level may slow the landslide deformation down.

• Periodical: Applied Mechanics and Materials (Volumes 580-583)
• Pages: 2694-2701
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.580-583.2694
• Online since: July 2014
• Authors: Bing Han*, Sheng Shan Hou, Bin Zhu, Li Chao Wang, Ang Li, He Jiong Ye
• Keywords: Deformation Prediction, Ground Water, Hongyanzi Landslide, Multi-Parameter Monitoring, Reservoir

References

[1] Wu Yan-qing, Groundwater flow and geological hazards, Underground Space, 1999, 19(4) 303－310. (In Chinese).

[2] Jones F. O., Embody D. R., Peterson W. L., Landslides along the Columbia River Valley, Northeastern Washington, US Geol. Surv. Prof. 367, 98(1961).

DOI: 10.3133/pp367

[3] Hiroyuki N, Discussion on the reservoir landslide, Bulletin of Soil and Water Conservation, 1990, 10(1): 53－64.

[4] Wang Shitian, Liu Hanchao, Zhang Zhuoyuan, Research on the water-rock interaction and its environmental effects in reservoir areas, Journal of Geological Hazards and Environment Preservation, 1997, 8(1): 69–88. (In Chinese).

[5] Tang Hui-ming, Zhang Guang-cheng, Study on slope stability during reservoir water level falling, Rock and Soil Mechanics, 2005, 26(SUP. 2): 11－15. (In Chinese).

[6] Committee on Reservoir Slope Stability, Reservoir Landslides: Investigation and Management, Paris: International Commission on Large Dam (2002).

[7] Chengdu Hydroelectric Investigation & Design Institute, Geological hazard assessment of Pubugou Hydropower Station(2003). (In Chinese).

[8] Sichuan Institute of Geological Engineering Investigation, Drilling and experiment report for Hongyanzi landslide(2013). (In Chinese).

[9] China Earthquake Administration, Seismic intensity map for Lushan Ms7. 0 Earthquake(2013).

[10] China Strong Motion Networks Center, Strong motion records for Lushan Ms7. 0 Earthquake(2013). (In Chinese).

[11] Zhu Dong-lin, Ren Guang-ming, Nie De-xing, Effecting and forecasting of landslide stability with the change of reservoir water level, Hydrogeology and Engineering Geology, 2002, 23(3): 378－381. (In Chinese).

[12] Liao Hong-jian, Sheng Qian, Gao Shi-hang, Influence of drawdown of reservoir water level on landslide stability, Chinese Journal of Rock Mechanics and Engineering, 2005, 24(19): 56－60. (In Chinese).

[13] Liu Xin-xi, Xia Yuan-you, Zhang Xian-shu, Effects of drawdown of reservoir water level on landslide stability, Chinese Journal of Rock Mechanics and Engineering, 2005, 24(8): 1439－1444. (In Chinese).

[14] Liu Xin-xi, Xia Yuan-you, Lian Cao, Research on method of landslide stability valuation during sudden drawdown of reservoir level, Rock and Soil Mechanics, 2005, 26(9): 1427－1432. (In Chinese).