Numerical researches on deformation characteristics and prediction of reservoir landslides
TANG Xiao-song1, 2, ZHENG Ying-ren1, 2, TANG Hui-ming3, LIU Zhi-xiang4
1. Logistical Engineering University, Chongqing 400041, China; 2. Chongqing Engineering and Technology Research Center of Geological Hazard Prevention and Treatment, Chongqing 400041, China; 3. Faculty of Engineering, China University of Geosciences, Wuhan 430074, China; 4. Civil King Software Technology Co., Ltd., Beijing 100044, China
Abstract：Reservoir landslide is different from other mountain landslides, and its stability is obviously influenced by the fluctuation of water level. Due to its particularity and importance, the researches on the deformation characteristics and prediction of reservoir landslides have become the focus and difficult points. The fluctuation of reservoir water level will change the hydraulic boundary conditions and lead to unstable flows in the seepage field of the slope. The traditional analysis method cannot study the failure characteristics of deformation, the dynamic variation of stability and the prediction of unstable failure. So based on the numerical limit analysis, the deformation characteristics of landslides during the descending of water level and the dynamic variation law of stability are studied. The deformation characteristics of landslides are quantitatively studied through displacement-time relationship curve and its logarithmic relationship curve. The angle between the section of steep rise (acceleration section) of horizontal displacement and horizon is put forward to be the criterion for sliding prediction. It provides a new idea for understanding the failure mechanism of reservoir landslides and the improvement of prediction.
 黄润秋),许 强 中国典型灾难性滑坡[M].北京:科学出版社,2008. (HUANG Run-qiu, XU Qiang. Catastrophic landslides in China[M]. Beijing: Science Press, 2008. (in Chinese)  黄润秋). 20世纪以来中国的大型滑坡及其发生机制[J]. (岩石力学与工程学报), 2007,26(3):433-454. (HUANG Runqiu. Large-scale landslide and their sliding mechanisms in China since the 20th century[J]. Chinese Journal of Rock Mechanics and Engineering,2007,26(3): 433-454. (in Chinese)  HU X L, POTTS M D, ZDRAVKOVI L,et al. Jinle landslide stability under water level fluctuation of Three Gorges reservoir[J]. Earth Science-Journal of China University of Geosciences, 2007,32(3):403-408.  章广成). 水位变化对滑坡稳定性的影响研究[D]. 武汉: 中国地质大学, 2005.(ZHANG Guang-cheng. The researches on the influence of the fluctuation of water level on landslide stability[D]. Wuhan: China University of Geosciences, 2005.( (in Chinese))  时卫民). 三峡库区滑坡与边坡稳定性实用分析方法研究[D]. 重庆: 后勤工程学院, 2004.(SHI Wei-min. The research on the practical method to analyzing the landslide and Slope Stability in the Three-gorge Reservoir Area[D]. Chongqing: China University of Geosciences, 2004.( (in Chinese))  时卫民),(郑颖人). 库水位下降情况下滑坡的稳定性分析[J]. (水利学报), 2004(3):67-71. (SHI Wei-min, ZHENG Ying-ren. Analysis on stability of landslide during reservoir drawdown[J]. Journal of Hydraulic Engineering, 2004(3): 67-71.( (in Chinese))  GRIFFITHS D V, LANE P A. Slope stability analysis by finite elements[J]. G000e9;otechnique, 1999,49(3):387-403.  DESAI C S. Drawdown analysis of slopes by numerical method[J]. Journal of the Geotechnical Engineering, 1977,103(GT7):667-676.  唐哓松),(郑颖人). 应用 PLAXIS有限元程序进行渗流作用下的边坡稳定性分析[J]. (长江科学院院报), 2006,23(4):13-16. (TANG Xiao-song, ZHENG Ying-ren. Stability analysis of soil slope under seepage by plaxis finite element program[J]. Journal of Yangtze River Scientific Research Institute, 2006, 23(4): 13-16.( (in Chinese))  MATSUI T, SAN K C. Finite element slope stability analysis by shear strength reduction technique[J]. Soils and Foundations, 1992,32(1):59-70.  ZIENKIEWICZ O C, HUMPHESON C, LEWIS R W. Associated and non-associated visco-plasticity and plasticity in soil mechanics[J]. G000e9;otechnique, 1975,25(4):671-689.  郑颖人),(赵尚毅). 有限元强度折减法在土坡与岩坡中的应用[J]. (岩石力学与工程学报), 2004,23(19):3381-3388. (ZHENG Ying-ren, ZHAO Shang-yi. Application of FEM strength reduction in soil slope and rock slope[J]. Chinese Journal of Rock Mechanics and Engineering, 2004, 23(19): 3381-3388.( (in Chinese))  郑颖人),(赵尚毅),(李安洪) 有限元极限分析法及其在边坡中的应用[M].北京:人民交通出版社,2011. (ZHENG Ying-ren, ZHAO Shang-yi, LI An-hong. FEM limit analysis and its application in slope engineering[M] Beijing: China Communications Press,2011. (in Chinese))  郑颖人),(赵尚毅). 岩土工程极限分析有限元法及其应用[J]. (土木工程学报), 2005,38(1):91-98. (ZHENG Ying-ren, ZHAO Shang-yi. Limit state finite element method for geotechnical engineering analysis and its applications[J]. China Civil Engineering Journal, 2005, 38(1): 91-98.( (in Chinese))  郑颖人),(唐晓松). 库水作用下的边(滑)坡稳定性分析[J]. (岩土工程学报), 2007,27(8):1115-1121. (ZHENG Ying-ren, TANG Xiao-song. Stability analysis of slopes under drawdown condition of reservoirs[J]. Chinese Journal of Geotechnical Engineering, 2007, 27(8): 1115-1121.( (in Chinese))  唐晓松),(郑颖人),(林成功) 水位下降过程中超孔隙水压力对边坡稳定性的影响[J]. 水利水运学报,2007, 111(1): 1-6. (TANG Xiao-song, ZHENG Ying-ren, LIN Cheng-gong. Effect of excess pore water pressure on stability of slopes under drawdown condition[J] Hydro-Science and Engineering,2007, 111(1): 1-6.(in Chinese))  陈卫兵),(郑颖人),(冯夏庭). 考虑岩土流变特性的强度折减法研究[J]. (岩土力学), 2008,29(1):101-105. (CHEN Wei-bing, ZHENG Ying-ren, FENG Xia-ting. Study on strength reduction technique considering rheological property of rock and soil medium[J]. Rock and Soil Mechanics, 2008, 29(1): 101-105.( (in Chinese))  谭万鹏),(郑颖人),王 凯. 考虑蠕变特性的滑坡稳定状态分析研究[J]. (岩土工程学报), 2010,32(增刊2):5-8. (TAN Wan-peng, ZHENG Ying-ren, WANG Kai. Stable state of landslide considering creep properties[J]. Chinese Journal of Getechnical Engineering,2010,32(S2): 5-8. (in Chinese)  谭万鹏),(郑颖人),(陈卫兵). 动态、多手段、全过程滑坡预警预报研究[J]. (四川建筑科学研究), 2010,36(1):106-111. (TAN Wan-peng, ZHENG Ying-ren, CHEN Wei-bing. Studies on the land-slope forecast and early warning by more means in full dynamic discourse[J]. Sichuan Building Science, 2010, 36(1): 106-111.( (in Chinese))