利用黏土和黄砂混合配制试验筑坝材料,开展水槽试验,模拟均质土石坝漫顶破坏过程,研究溃坝模式对溃坝参数的影响。试验中观测到3种漫顶破坏模式:陡坎蚀退冲刷溃决模式(M1)、剪切蚀退坍塌溃决模式(M2)和浸泡剥蚀破坏模式(M3)。相同库容和坝高条件下,不同模式最大溃决流量差异较大:Qp(M2)>Qp(M1,M3);定义水流开始漫顶至水库内库存水流构成漫坝破坏的主要动力源的时间为漫顶临界时间TC,则TC(M2)<TC(M1)<TC(M3)。溃坝模式反映了漫顶流量、初始溃口、坝高和筑坝材料等因素对漫顶溃决的综合影响,是除坝高、库容外溃坝参数预测的重要影响因子。
Abstract
In order to simulate overtopping breach of homogeneous earth-rock dams, we carried out experiment in water tank using sand and clay to make mixed materials for dam, and discussed the impact of overtopping breach mode on dam-break parameters. We divided the overtopping breach modes into three kinds: erosion and scour of scarp(M1), erosion and collapse of shear (M2) and erosion and collapse of soak (M3). In the presence of given capacity of reservoir and dam height, maximum breach discharges (Qp) of different modes are obviously unequal, and Qp of M2 is the biggest. Breach Critical time(TC) is referred to as the time from the beginning of overtopping to the developing of breach, and TC of M2 is the smallest, followed by that of M1 and M3. Breach mode depicts the effects of overtopping flow, initial breach, dam height and dam materials on dam-break process. Besides dam height and capacity of reservoir, breach mode is another important factor for dam-break prediction and disaster assessment.
关键词
土石坝 /
漫顶溃决 /
破坏模式 /
溃决参数 /
灾害评估
Key words
earth-rock dam /
overtopping breach /
breach mode /
parameters of breach /
disaster assessment
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参考文献
[1]解家毕, 孙东亚. 全国水库溃坝统计及溃坝原因分析[J]. 水利水电技术, 2009. 40(012): 124-128.
[2]LUO Y , CHEN L , XU M, et al. Review of Dam-break Research of Earth-rock Dam Combining with Dam Safety Management[J]. Procedia Engineering,2012, 28(12): 382-388.
[3]WU Wei-ming,ALTINAKAR M S,BRADFORD S F, et al. Earthen Embankment Breaching[J]. Journal of Hydraulic Engineering, 2011, 137(8): 1549-1564.
[4]CHINNARASRI C, TINGSANCHALI T, WEESAKUL S, et al. Flow Patterns and Damage of Dike Overtopping[J]. International Journal of Sediment Research,2003,18(4):301-309.
[5]FROEHLICH D C. Embankment Dam Breach Parameters and Their Uncertainties[J]. Journal of Hydraulic Engineering,2008, 134(12): 1708-1721.
[6]ALQASER G, RUFF J F. Progressive Failure of An Overtopped Embankment[C]∥American Society of Civil Engineers. Proceedings of 1993 ASCE National Conference on Hydraulic Engineering. San Francisco, California, USA, July 25-30, 1993: 1957-1962.
[7]POWLEDGE G R, RALSTON D C, MILLER P, et al. Mechanics of Overflow Erosion on Embankments I: Research Activities[J]. Journal of Hydraulic Engineering, 1989,115(8): 1040-1055.
[8]ZHANG J Y, LI Y, XUAN G X, et al. Overtopping Breaching of Cohesive Homogeneous Earth Dam with Different Cohesive Strength[J]. Science in China Series E: Technological Sciences, 2009, 52(10): 3024-3029.
[9]COLEMAN S E, ANDREWS D P, WEBBY M G. Overtopping Breaching of Noncohesive Homogeneous Embankments[J]. Journal of Hydraulic Engineering, 2002, 128(9):829-838.
[10]PICKERT G, WEITBRECHT V, BIEBERSTEIN A. Breaching of Overtopped River Embankments Controlled by Apparent Cohesion[J]. Journal of Hydraulic Research, 2011, 49(2): 143-156.
[11]YOU Luo, LI Chen, MIN Xu , et al. Breaking Mode of Cohesive Homogeneous Earth-rock-fill Dam by Overtopping Flow[J]. Natural Hazards,2014,74(2):527-540.
[12]CHINNARASRI C,JIRAKITLERD S,WONGWISES S.Embankment Dam Breach and Its Outflow Characteristics[J]. Civil Engineering and Environmental Systems, 2004,21(4): 247-264.
[13]WEBBY M G. Discussion of “Peak Outflow from Breached Embankment Dam” by David C. Froehlich[J]. Journal of Water Resources Planning and Management, 1996, 122(4): 316-317.
[14]HAGEN V K. Re-evaluation of Design Floods and Dam Safety[C]∥International Commission on Large Dams .Proceeding of 14th Congress of International Commission on Large Dams. Rio de Janeiro, Brazil, August 9-14, 1982:475-491.
[15]MACDONALD T C , MONOPOLIS J L. Breaching Characteristics of Dam Failures[J]. Journal of Hydraulic Engineering, 1984, 110(5): 567-586.
[16]COSTA J E. Floods from Dam Failures[R]. Denver, USA: U.S. Geological Survey,1985: 54.
[17]FROEHLICH D C. Peak Outflow from Breached Embankment Dam[J]. Journal of Water Resources Planning and Management, 1995,121(1): 90-97.
[18]PIERCE M W, THORNTON C I, ABT S R. Predicting Peak Outflow from Breached Embankment Dams[J]. Journal of Hydrologic Engineering, 2009, 15(5): 338-349.
[19]李 云, 祝 龙, 宣国祥, 等. 土石坝漫顶溃决时间预测分析[J]. 水力发电学报, 2013, 32(5): 174-178.
基金
国家自然科学基金项目(10932012,51409132)
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