易贡滑坡堰塞湖溃坝洪水分析.pdf

Journal of Engineering Geology工程地质学报1004-9665/2010/18(1)-0078-06
易贡滑坡堰塞湖溃坝洪水分析
邢爱国徐娜娜宋新远
(上海交通大学土木工程系上海200240)
摘要滑坡堰塞坝体主要由块石、碎石土等松散材料组成,随着上游水位的不断上升,极易失稳,一旦决口将对给下游人民
的生命财产安全造成极大的威胁。因此,研究堰塞坝溃坝问题具有重要的学术意义和应用价值。2000年4月9日,西癜林芝
地区波密县易贡癜布河扎木弄沟发生大规模山体滑堵塞易贡疲布江形成坝高60m,长约2500m,库容可达288×10°m3,体
积约2.8x103~3.0x10°m3的滑坡堰塞湖,2000年6月10日堰塞坝溃决。本文以易贡堰塞激坝为例,从连续性方程及
Navier- Stokes方程出发,结合标准型湍流模型,并采用VOF方法进行自由面处理,基于流体计算软件uet模拟分析∫潰坝洪
水在下游弯曲河道的演进过程及不同位蛩的流速变化。数值模拟结果与实测资料记录基本一致,表明该模型能够模拟溃坝
洪水在地形复杂弯曲河道中的演进过程。
关鍵词堰塞湖溃坝数值模拟 Lent
中图分类号:P642.22文就标识码:A
NUMERICAL SMMULATION OF LAKE WATER DOWN-STREAM FLOODING
DUE TO SUDDEN BREAKAGE OF YIGONG LANDSLIDE DAM IN TIBET
XING Aiguo XU Nana SONG Xinyuan
Department of Civil Engineering, Shanghai Jiao Tong Universiy, Shanghai 200240)
Abstract The dam of the landslide debris barrier lake mainly consists of boulder and stony soil and it is more vul-
nerable to instability as the result of a rise in water level. The dam-break may cause huge economic property and
life loss. Therefore the study of dam-break problem has important academic significance and application value. A
high-speed giant landslide occurred in Yigong River in the Bomi, Tibet, on April 9, 2000. A landslide dam was
formed suddenly with 2500 m long, 2500 m wide and 60 m high, 280-300 million m in volume. A debris barrier
lake was formed. Taking the dam-break of Yigong barrier lake as an example, according to the continuity equation
and Navier-stokes equation, combining with standard turbulence model, and tracking the free-surface with VOF
method, via computational fluid dynamics software Fluent, this paper analyzes the dam-break flood evolution in
downstream river course and the velocity changes at different sites. The simulation results are consistent with the
observed data. At the same time, it shows that the model can simply simulate the flood evolution in the river bend
with complex terrain after dam-break. The study can provide the prevention of dam-break disaster in terms of down-
floodi
Key words Dam-break, Numerical simulation, FLUENT, Yigong landslide, River flooding
收稿日期:2009-09-08;收到修改稿日期:2009-12-06
基金项目:国家科技支撑计划项目(2006BAC04BO2);国家自然科学基金项目(40602035);上海市重点学科建设项目资助(B208)
第一作者简介:邢爱国,从事地质灾害防治方面的教学与研究工作.Email:xingguo@situ,edu.cn