以长江中游荆江出口熊家洲至城陵矶段典型断面为例，利用河岸稳定性与坡脚侵蚀模型(BSTEM)计算了2个典型断面在不同自然条件下的岸坡形态、水位条件、坡脚横向冲刷距离、植被类型及有护岸工程条件下河岸稳定的安全系数，分析了这些因素对河道岸坡稳定性的影响。结论表明:水位变化对河岸稳定性有重要影响，高、低水位岸坡稳定性与河岸组成密切相关，退水速率较快时，安全系数大幅度减小，易引起崩岸的发生；不同岸坡形态下河岸安全系数也不同，均随着坡脚横向冲刷距离的增大而减小；坡面实施护岸工程与植被覆盖会增加岸坡的稳定性。
Abstract
By using BSTEM (Bank Stability and Toe Erosion Model),the stability safety factors of two typical sections are calculated respectively under different conditions. These conditions include bank slope morphology,water level,lateral erosion distance of toe,vegetation type and revetment project. The impact of these factors on the river bank slope stability are also analyzed. Results show that water level variation has significant impact on riverbank stability. The stability of bank slope with high and low water levels is closely related with the riverbank composition. When the rate of water level recession is high,the safety factor reduces remarkably which is prone to cause bank collapse. It also shows that the safety factors are different in different bank slope morphologies,and the safety factor decreases as the lateral erosion distance of toe increases. Revetment project and vegetation coverage will increase the bank slope stability.
关键词
BSTEM /
河岸稳定性 /
崩岸 /
岸坡形态 /
水位变化
Key words
BSTEM /
riverbank stability /
bank failure /
bank morphology /
water level variation
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] 余文畴.长江中下游河道崩岸机理中的河床边界条件[J].长江科学院院报,2008,25(1):8-11.(YU Wen-chou. River Boundary Conditions of Mechanism of Bank Failure in Middle and Lower Reaches of Changjiang River[J]. Journal of Yangtze River Scientific Research Institute,2008,25(1): 8-11.(in Chinese))
[2] 余文畴,岳红艳.长江中下游崩岸机理中的水流泥沙运动条件[J].人民长江,2008,39(3):64-66.(YU Wen-chou,YUE Hong-yan. Flow and Sediment Motion Condition in Bank Collapsed Channel of Middle and Lower Yangtze River[J]. Yangtze River,2008,39(3): 64-66.(in Chinese))
[3] 陈引川,彭海鹰.长江下游大窝崩的发生及防护[C]∥长江中下游护岸工程论文集(3),武汉:长江科学院,1985:112-116.(CHEN Yin-chuan,PENG Hai-ying. Forming Conditions and Protective Measures of Bank Collapse in the Lower Yangtze River[C]∥Proceedings of the Middle and Lower Yangtze River Bank Protection Project(3),Wuhan: Yangtze River Scientific Research Institute,1985:112-116.(in Chinese))
[4] 马崇武,刘忠玉,苗天德,等.江河水位升降对堤岸变坡稳定性的影响[J].兰州大学学报(自然科学版),2000,36(3):56-60.(MA Chong-wu,LIU Zhong-yu,MIAO Tian-de,et al. The Influence of Water Level Changing on the Stability of River Embankment[J]. Journal of Lanzhou University (Natural Sciences),2000,36(3): 56-60.(in Chinese))
[5] 唐金武,邓金运,由星莹,等.长江中下游河道崩岸预测方法[J].四川大学学报(工程科学版),2012,(1):75-81.(TANG Jin-wu,DENG Jin-yun,YOU Xing-ying,et al. Forecast Method for Bank Collapse in Middle and Lower Yangtze River[J]. Journal of Sichuan University (Engineering Science Edition),2012,(1): 75-81.(in Chinese))
[6] THORNE C R,TOVEY N K. Stability of Composite River Banks[J]. Earth Surface Processes and Landforms,1981,6(5): 469-484.
[7] OSMAN A M,THORNE C R. Riverbank Stability Analysis I: Theory [J]. Journal of Hydraulic Engineering,1988,114(2): 134-150.
[8] THRONE C R,OSMAN A M. Riverbank Stability Analysis II: Application[J]. Journal of Hydraulic Engineering,1988,114 (2): 151-172.
[9] SIMON A,CURINI A. Pore Pressure and Bank Stability: The Influence of Matric Suction[C]∥Proceedings of Water Resources Engineering Conference 1998,Memphis,Tennessee: ASCE,August 3-7,1998: 358-363.
[10]SIMON A,COLLISON A J C. Quantifying the Mechanical and Hydrologic Effects of Riparian Vegetation on Streambank Stability[J]. Earth Surface Processes and Landforms,2002,27(5): 527-546.
[11]卢金友,渠 庚,李发政,等.下荆江熊家洲至城陵矶河段演变分析与治理思路探讨[J],长江科学院院报,2011,28(11):113-119.(LU Jin-you,QU Geng,LI Fa-zheng,et al. Channel Evolution of the Reach from Xiongjiazhou to Chenglingji in Lower Jingjiang River and Regulation Considerations[J]. Journal of Yangtze River Scientific Research Institute,2011,28(11): 113-119.(in Chinese))
[12]长江勘测规划设计研究有限研究公司. 长江中游熊家洲至城陵矶河段河势控制应急工程工程地质勘察报告[R]. 武汉:长江勘测规划设计研究有限研究公司,2011.(Changjiang Institute of Survey Planning Design and Research. Report on the Engineering Geology Investigation for the Regime Control Emergency Project from Xiongjiazhou to Chenglingji in the Middle Reach of the Yangtze River [R]. Wuhan: Changjiang Institute of Survey Planning Design and Research,2011.(in Chinese))
[13]姚仕明,何广水,卢金友.三峡工程蓄水运用以来荆江河段河岸稳定性初步研究[J].泥沙研究,2009,(6):24-30.(YAO Shi-ming,HE Guang-shui,LU Jin-you. Preliminary Study on Bank Stability in Jingjiang Reach since Operation of the Three Gorges Project[J]. Journal of Sediment Research,2009,(6): 24-30.(in Chinese))
基金
水利部公益性行业科研专项经费项目(200901004)
PDF(2799 KB)
