考虑引流槽开挖措施的堰塞坝溃决机制分析  

Breaching mechanism analysis of landslide dam considering drainage channel excavating measures

作　　者：王琳[1] 李炎隆[1] 李守义[1] 薛一峰[2] 司政[1] Wang Lin;Li Yanlong;Li Shouyi;Xue Yifeng;Si Zheng(State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China,Xi’an University of Technology,710048,Xi’an,China;Water and Electricity Engineering Branch,Shaanxi Province Institute of Water Resources and Electric Power Investigation and Design,710001,Xi’an,China)

机构地区：[1]西安理工大学省部共建西北旱区生态水利国家重点实验室,西安710048 [2]陕西省水利电力勘测设计研究院水电工程分院,西安710001

出　　处：《应用力学学报》2019年第6期1412-1419,I0011,共9页Chinese Journal of Applied Mechanics

基　　金：国家优秀青年科学基金项目(51722907);国家自然科学基金重点项目(41731289);国家自然科学基金(51579208)

摘　　要：基于土水耦合机制,耦合溃口水力学、溃口扩展、溃口侵蚀、洪水调节模型,提出了考虑引流槽开挖措施的堰塞坝溃决机制分析方法,并应用于红石岩堰塞坝案例,定量分析了不同开挖措施导致的溃决洪峰流量、洪峰时间、总泄洪量以及对下游梯级水库群的风险效应。结果表明,若单一考虑坝址的溃决洪水,不同开挖措施的溃决洪峰流量及溃决时间相差不多,溃决洪峰流量差值在360m3/s范围内变化。当开挖的引流槽宽度增加时,堰塞坝洪峰流量降低,总泄洪量增加,到达洪峰时间相差不多,下游水库群的最高水位、出库洪峰流量降低,漫顶时间推迟。当深度增加时,堰塞坝溃决洪峰流量、总泄洪量降低,到达洪峰时间提前,下游水库群的最高水位、出库洪峰流量降低,漫顶时间提前。以下游梯级水库群不翻坝为首要风险安全控制标准,可确定引流槽开挖最优方案为宽20m、深10m。This paper provides a breaching analysis method for landslide dam by considering the excavating measures of the drainage channel, based on the interaction of hydraulic and soil, which is applied to a case study of the Hongshiyan Landslide Dam. By coupling erosion, lateral enlargement, hydraulics and flood regulation model, it analyzes quantitatively the peak discharge, the breach time, the total amount of the released reservoir storage and its risk influence on the downstream cascade reservoirs in different excavating measures. The case study shows that the peak discharge and the breach time of landslide dam varies within 360 m3/s in different excavating measures. It is quickly determined that 20 m width and 10 m depth is the optimal excavating measure, when the primary risk safety control standard is the downstream cascade reservoirs not overtopping. With the width of drainage channel increases, the peak discharge decreases, the total amount of the released reservoir storage increases, the overtopping time is similar. The highest water level and the discharge of the downstream reservoirs decreases, the overtopping time increases. With the depth of drainage channel increases, the peak discharge and the total amount of the released reservoir storage decreases, the overtopping time decreases. The highest water level, the discharge, and the overtopping time of the downstream reservoirs decreases.

关 键 词：堰塞坝 引流槽 开挖措施 梯级水库群 

分 类 号：TV641[水利工程—水利水电工程]