1. State Nuclear Electric Power Planning, Design and Research Institute, Beijing 100095, China; 2. Civil and Environmental Engineering Institute, University of Science and Technology Beijing, Beijing 100083, China; 3. Institute of Environmental Systems, Kyushu University, Fukuoka 812-8581, Japan
Abstract：The rainfall is one of the main factors to induce landslides. The percolation process of the rainfall in the landslide mass is described. Some factors are taken into consideration, including change of wetting characteristics of soils, development tendency of the wetting front and transformation between the infiltrated rainfall amount and the groundwater level. The classical Green-Ampt model is coupled with 3D limit equilibrium model, which assumes infiltration area to be saturated and consideres arbitrary rainfall intensity. A real-time evaluation model for infiltration-stability is established based on grid data format of GIS. It can quantitatively assess stability of landslide by the location of the sliding surface. Finally, there are some examples to validate that the proposed method can be employed to assess and analyze the stability of a single landslide.
[1] 中国地质环境监测院. 全国地质灾害通报2010年1～12月[OL]. 中华人民共和国国土资源部http://219.142.70.139/ ReadNews.asp?NewsID=44485. (China Geological Environ- mental Monitoring Institute. National geological disasters bulletin (January～December 2010) [OL]. Ministry of Land Resources of the Peoples Republic of China. http://219. 142.70.139/ReadNews.asp?NewsID=44485. (in Chinese))[2] 吴宏伟, 陈守义, 庞宇威. 雨水入渗对非饱和土坡稳定性影响的参数研究[J]. 岩土力学, 1993, 20(1): 1–14. (WU Hong-wei, CHEN Shou-yi, PANG Yu-wei. Parametric study of effects of rain infiltration on unsaturated slopes[J]. Rock and Soil Mechanics, 1993, 20(1): 1–14. (in Chinese))[3] 詹良通, 吴宏伟, 包承纲, 等. 降雨入渗条件下非饱和土膨胀土边坡原位监测[J]. 2003, 24(2): 151–158. (ZHAN Liang-tong, NG Wang-wai Charles, BAO Cheng-gang. Artificial rainfall infiltration tests on a well-instrumented unsaturated expansive soil slope[J]. Rock and Soil Mechanics, 2003, 24(2): 151–158. (in Chinese))[4] 谢谟文, 蔡美峰. 信息边坡工程学的理论与实践[M]. 北京:科学出版社, 2005. (XIE Mo-wen, CAI Mei-feng. The theory and practice of information slope engineering[M]. Beijing: Science Press, 2005. (in Chinese))[5] 汪成民, ?用太, 萬迪堃, 等. 地下水微动态研究[M]. ?京: 地震出版社, 1998. (WANG Cheng-min, CHE Yong-tai, WAN Di-kun, et al. Micro dynamic research on groundwater[M]. Beijing: Seismological Press, 1988. (in Chinese))[6] 王政友. 降雨入渗补给地下水滞后时间分析探讨[J]. 水文, 2011, 31(2): 42–45. (WANG Zheng-you. Discussion on lag time of rainfall penetration recharge to groundwater[J]. Journal of China Hydrology, 2011, 31(2): 42–45. (in Chinese))[7] 朱文彬, 刘宝琛. 降雨条件下土体滑坡的有限元数值分析[J]. 岩石力学与工程学报, 2002, 21(4): 509–512. (ZHU Wen-bin, LIU Bao-chen. Forming and development process of soil landslide during rainfall[J]. Chinese Journal of Rock Mechanics and Engineering, 2002, 21(4): 509–512. (in Chinese))[8] SERRANO S E. Improved decomposition solution to Green-Ampt equayion[J]. Journal of Hydrologic Engineering, 2003, 8(3): 158–160. [9] CHU S T. Infiltration during unsteady rain[J]. Water Resour Res, 1978, 14(3): 461–466.[10] 刘传正. 重大地质灾害防治理论与实践[M]. 北京: 科学出版社, 2009. (LIU Chuan-zheng. The theory and methods on mega-hazards mitigation[M]. Beijing: Science Press, 2009. (in Chinese))[11] 邱 骋, 谢谟文, 江崎哲郎. 公路沿线花岗岩风化区滑坡危险度评价-以日本49号国道合户地区为例[J]. 中国地质灾害与防治学报, 2005, 16(1): 23–28. (QIU Cheng, XIE Mo-wen, ESAKI Tetsuro. Landslide hazard assessment on highway slope in weathered granite zone—An example of No.49 National Highway in Hehu area, Japan[J]. The Chinese Journal of Geological Hazard and Control, 2005, 16(1): 23–28. (in Chinese))[12] FREDLUND D G, KRAHN J. Comparison of slope stability methods of analysis[J]. Canadian Geotechnical Journal, 1977, 14: 429–439.[13] XING Z. Three-dimensional stability analysis of concave slopes in plan view[J]. Journal of Geotechnical Engineering, 1988, 114(6): 658–671.
