Abstract：There are many factors affecting bank collapse, and the causes are complex. Most of the existing studies focus on a single factor, and the relationship between the factors is unclear. Combined with laboratory flume test and numerical calculation, the process of bank collapse under the action of multiple factors is analyzed, and the mechanical mechanism of bank instability is revealed. The analysis results show that shear, tension and axial failure as well as soil shedding caused by the reduction of matrix suction are the main types of bank collapse caused by lateral flow scouring. The reduction of relative water depth (bank height/near shore water depth) causes the bank failure type to change from axial failure to shear failure. The joint action of seepage and lateral flow will greatly accelerate the bank collapse process.
龚政, 张凯丽, 赵堃. 多因素作用下河道崩岸过程试验与数值模拟研究[J]. 中国防汛抗旱, 2022, 32(9): 16-20.
GONG Zheng, ZHANG Kaili, ZHAO Kun. Experimental and numerical simulation of bank collapse process under multi factors. journal1, 2022, 32(9): 16-20.
[1] Van Eerdt M M.Salt marsh cliff stability in the Oosterschelde[J].Earth Surface Processes and Landforms,1985,10(2):95-106. [2] 余文畴,卢金友.长江河道崩岸与护岸[M].北京:中国水利水电出版社,2008. [3] 假冬冬,杨俊,陈长英,等.中国北方季节性冰冻河流岸滩崩塌数值模拟——以松花江为例[J].水科学进展,2021,32(5):717-726. [4] 卢金友,朱勇辉,岳红艳,等.长江中下游崩岸治理与河道整治技术[J].水利水电快报,2017,38(11):6-14. [5] 朱海丽,李志威,胡夏嵩,等.黄河源草甸型弯曲河流的悬臂式崩岸机制[J].水利学报,2015,46(7):836-843. [6] 余明辉,陈曦,魏红艳,等.不同近岸河床组成情况下岸坡崩塌试验[J].水科学进展,2016,27(2):176-185. [7] 夏军强,邓珊珊.冲积河流崩岸机理、数值模拟及预警技术研究进展[J].长江科学院院报,2021,38(11):1-10. [8] 况卫明,黎良辉,赖敬飞,等.水位骤变条件下河流崩岸模型试验及机理研究[J].水电能源科学,2021,39(1):130-133. [9] Zhang K,Gong Z,Zhao K,et al.Experimental and numerical modeling of overhanging riverbank stability[J].Journal of Geophysical Research:Earth Surface,2021,126(10):e2021JF006109. [10] 黄本胜,白玉川,万艳春.河岸崩塌机理的理论模式及其计算[J].水利学报,2002(9):49-54. [11] Rinaldi M,Darby S E.Modelling river-bank-erosion processes and mass failure mechanisms:progress towards fully coupled simulations[J].Developments in Earth Surface Processes,2007(11):213-239. [12] Fox G A,Wilson G V.The role of subsurface flow in hillslope and stream bank erosion:a review[J].Soil Science Society of America Journal,2010,74(3):717-733. [13] 王延贵,匡尚富.河岸崩塌类型与崩塌模式的研究[J].泥沙研究, 2014(1):13-20. [14] 夏军强,宗全利,许全喜,等.下荆江二元结构河岸土体特性及崩岸机理[J].水科学进展,2013,24(6):810-820. [15] 许琳娟,江恩慧,李军华,等.近岸水流对二元结构河岸冲刷模拟试验[C]//中国水利学会2020学术年会论文集第三分册.2020:108-115. [16] 赵堃,龚政,陈海英.长江中下游条崩型崩岸机理分析[J].江苏水利, 2021(S2):53-56,92. [17] Zhao K,Gong Z,Zhang K,et al.Laboratory experiments of bank collapse:The role of bank height and near-bank water depth[J].Journal of Geophysical Research:Earth Surface,2020,125(5):e2019JF005281.
2022, Vol. 32 
