堰塞坝漫顶溃决过程数值模拟及应用

沈光泽; 盛金保; 向衍; 钟启明

doi:10.11779/CJGE2018S2017

堰塞坝漫顶溃决过程数值模拟及应用 English Version

沈光泽¹,
盛金保^1,2,
向衍^1,2,
钟启明^1,2

1. 南京水利科学研究院,江苏南京 210029;
2. 水利部土石坝破坏机理与防控技术重点实验室,江苏南京 210029

基金项目: 国家重点研发计划项目课题（2016YFC0401600）; 国家自然科学基金项目（51539006,51779153,51509164,51679151）

详细信息

作者简介:
沈光泽（1991- ）,男,黑龙江伊春人,博士研究生,主要从事大坝风险管理领域的研究。E-mail: gzshen@nhri.cn。

中图分类号: TV641
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出版历程
- 收稿日期: 2018-07-21
- 发布日期: 2018-10-29

Numerical modeling of breach process of landslide dams due to overtopping and its application

1. Nanjing Hydraulic Research Institute, Nanjing 210029, China;
2. Key Laboratory of Earth-Rock Dam Failure Mechanism and Safety Control Techniques, Ministry of Water Resources, Nanjing 210029, China

摘要

摘要: 堰塞坝作为自然形成的天然坝体,其结构不稳定性强,绝大多数的堰塞坝最终都将发生漫顶溃决,一旦溃决,将会对下游带来巨大的生命和财产损失。因此,有必要合理预测堰塞坝的溃决流量过程,为溃坝应急预案的编制提供理论与技术支撑。本文充分考虑堰塞坝的形态特征及坝料的物理力学特性,建立了一个可合理模拟堰塞坝漫顶溃坝过程的数学模型。该模型可较好地反映水动力条件下的溃口发展过程和下泄流量过程。选择西藏易贡堰塞坝溃坝案例对模型进行验证,通过计算结果与实测资料的对比发现：计算得到的溃口峰值流量、最终溃口宽度、峰值流量到达时间等参数的最大相对误差均在±15%以内;溃口流量过程与实测资料也吻合较好,有效地验证了模型的合理性;参数敏感性分析结果显示,残留坝高、冲蚀模式（单侧与两侧冲蚀）、冲蚀系数等参数对溃坝过程均有重要影响。
- 堰塞坝 /
- 漫顶溃坝 /
- 数值模拟 /
- 参数敏感性分析
Abstract: As a production of natural process, the landslide dam has poor structural stability, and most of which will finally fail due to overtopping, which will pose tremendous risks to the people and property in the inundated area. Therefore, it is of significant importance to predict the discharge hydrograph for the breach process of landslide dams so as to provide theoretical and technique supports to the dam emergency plan for dam breaching. In this study, based on the geometrical characteristics, physical and mechanical properties of a landslide dam, a numerical model for the breach process of the landslide dam due to overtopping failure is developed. This model can reasonably reflect the evolution and discharge hydrograph of the breach under the hydrodynamic condition. Meanwhile, the dam breach case of Yigong landslide dam is chosen as the representative to testify the proposed model. The comparison of the measured and calculated results shows that, the relative errors for the peak discharge, final breach widths, and time to peak are within ±15%; furthermore, the breach discharge hydrograph is in accordance with the measured one. Thus, the rationality of the model is verified effectively. The sensitivity studies show that the dam breach process is sensitive to the residual dam height, the erosion mode (one- or two- sided breach), and the soil erodibility.
- landslide dam /
- overtopping failure /
- numerical modeling /
- sensitivity analysis of parameters

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参考文献(22)

[1]	陈生水. 土石坝溃决机理与溃坝过程模拟[M]. 北京: 中国水利水电出版社, 2012. (CHEN Sheng-shui.Breach mechanism and simulation of breach process for earth-rock dams[M]. Beijing: China Water Power Press, 2012. (in Chinese))
[2]	陈生水, 赵天龙, 钟启明. 堰塞坝溃坝数学模型研究与应用[J]. 水利水运工程学报, 2015(3): 1-8. (CHEN Sheng-shui, ZHAO Tian-long, ZHONG Qi-ming.Dam-break numerical model for a landslide dam and its application[J]. Hydro-Science and Engineering, 2015(3): 1-8. (in Chinese))
[3]	任强, 陈生水, 钟启明, 等. 堰塞坝的形成机理与溃决风险[J]. 水利水电科技进展, 2011, 31(5): 30-34. (REN Qiang, CHEN Sheng-shui,ZHONG Qi-ming, et al.Formation mechanism and breaching failure risk of landslide dams[J]. Advances in Science and Technology of Water Resources, 2011, 31(5): 30-34. (in Chinese))
[4]	严祖文, 魏迎奇, 蔡红. 堰塞坝形成机理及稳定性分析[J]. 中国地质灾害与防治学报, 2009, 20(4): 55-59. (YAN Zu-wen, WEI Ying-qi, CAI Hong.Formation mechanism and stability analysis of landslide dam[J]. The Chinese Journal of Geological Hazard and Control, 2009, 20(4): 55-59. (in Chinese))
[5]	石振明, 马小龙, 彭铭, 等. 基于大型数据库的堰塞坝特征统计分析与溃决参数快速评估模型[J]. 岩石力学与工程学报, 2014, 33(9): 1780-1790. (SHI Zhen-ming, MA Xiao-long, PENG Ming, et al.Statistical analysis and efficient dam burst modelling of landslide dams based on a large-scale database[J]. Chinese Journal of Rock Mechanics and Engineering, 2014, 33(9): 1780-1790. (in Chinese))
[6]	谢亚军, 朱勇辉, 国小龙. 土坝溃决研究进展及存在问题[J]. 长江科学院院报, 2013, 30(4): 29-33. (XIE Ya-jun, ZHU Yong-hui, GUO Xiao-long.Advances and problems in earth-dam failure research[J]. Journal of Yangtze River Scientific Research Institute, 2013, 30(4): 29-33. (in Chinese))
[7]	ASCE/EWRI Task Committee on Dam/Levee Breach. Earthen embankment breaching[J]. Journal of Hydraulic Engineering, 2011, 137(12): 1549-1564.
[8]	DAVIES T R, MANVILLE V, KUNZ M, et al.Modeling landslide dambreak flood magnitudes: case study[J]. Journal of Hydraulic Engineering, 2007, 133(7): 713-720.
[9]	CHANG D S, ZHANG L M.Simulation of the erosion process of landslide dams due to overtopping considering variations in soil erodibility along depth[J]. Natural Hazards and Earth System Sciences, 2010, 10(4): 933-946.
[10]	SHI Z M, GUAN S G, PENG M, et al.Cascading breaching of the Tangjiashan landslide dam and two smaller downstream landslide dams[J]. Engineering Geology, 2015, 193: 445-458.
[11]	CHEN Z Y, MA L Q, YU S, et al.Back analysis of the draining process of the Tangjiashan landslide lake[J]. Journal of Hydraulic Engineering, 2015, 141(4): 05014011.
[12]	WANG L, CHEN Z Y, WANG N X, et al.Modeling lateral enlargement in dam breaches using slope stability analysis based on circular slip mode[J]. Engineering Geology, 2016, (209): 70-81.
[13]	SINGH V P.Dam breach modeling technology[M]. Dordrecht: Kluwer Academic Publishes, 1996.
[14]	US Dept of Agriculture, Natural Resources Conservation Service[R]. Natural Resources Conservation Service[R]. Washington DC: National Engineering Handbook, 1997.
[15]	WU W M.Simplified physically based model of earthen embankment breaching[J]. Journal of Hydraulic Engineering, 2013, 139(8): 837-851.
[16]	CHANG D S, ZHANG L M, XU Y, et al.Field testing of erodibility of two landslide dams trigged by the 12 May Wenchuan earthquake[J]. Landslides 2011, 8(3): 321-332.
[17]	ANNANDALE G W.Scour technology-mechanics and engineering practice[M]. New York: Mcgraw-Hill, 2006.
[18]	NIU Z P, XU W L, LI N W, et al.Experimental investigation of the failure of cascade landslide dams[J]. Journal of Hydrodynamics, 2012, 24(3): 430-441.
[19]	张婧, 曹叔尤, 杨奉广, 等. 堰塞坝泄流冲刷试验研究[J]. 四川大学学报(工程科学版), 2010, 42(5): 191-196. (ZHANG Jing, CAO Shu-you, YANG Feng-guang, et al.Experimental study on outlet and scour of blocked dam[J]. Journal of Sichuan University (Engineering Science Edition), 2010, 42(5): 191-196. (in Chinese))
[20]	刘宁, 杨启贵, 陈祖煜. 堰塞湖风险处置[M]. 武汉:长江出版社, 2016. (LIU Ning, YANG Qi-gui, CHEN Zu-yu.Hazard mitigation for landslide lakes[M]. Wuhan: Changjiang Press, 2016. (in Chinese))
[21]	王琳. 堰塞湖溃决洪水分析方法及侵蚀试验研究[D]. 西安: 西安理工大学, 2017. (WANG Lin.Study on flood analysis method and erosion test of landslide lake[D]. Xi'an: Xi'an University of Technology, 2017: 33-48. (in Chinese))
[22]	邢爱国, 徐娜娜, 宋新远. 易贡滑坡堰塞湖溃坝洪水分析[J]. 工程地质学报, 2010, 18(1): 78-83. (XING Ai-guo, XU Na-na, SONG Xin-yuan.Numerical simulation of lake water down-stream flooding due to sudden breakage of Yigong landslide dam in Tibet[J]. Journal of Engineering Geology, 2010, 18(1): 78-83. (in Chinese))