工程地质学报2016，Vol.24Issue(5)：741-751,11.DOI:10.13544/j.cnki.jeg.2016.05.003
考虑不同泄流槽方案的堰塞坝溃决机理分析--以唐家山堰塞坝为例
BREACHING MECHANISM ANALYSIS OF LANDSLIDE DAMS CONSIDER-ING DIFFERENT SPILLWAY SCHEMES-A CASE STUDY OF TANGJIA-SHAN LANDSLIDE DAM
摘要
Abstract
In recent years,many landslide dams are triggered by frequent tectonic activities and extreme climate. They are seriously threating the lives and properties in both upstream and downstream areas.Constructing spillway is the most common risk mitigation measure.The excavation volume of spillways is largely restricted by the limited available time and extremely terrible transportation conditions.It is urgently demanded to optimize spillway design and reduce the risk of dam failure to the minimum.This paper provides a breaching analysis method for landslide dams by considering the effect of different spillway design,which is applied to a case study of the Tangjiashan Landslide Dam.The instantaneous erosion rate during dam breaching can be obtained based on the interaction of hydraulic and soil erosive parameters.The influence of different spillways on the whole breaching process as well as the optimal spillway design are subsequently achieved.The case study shows that peak outflow rate could be reduced from the recorded 6500m3·s-1 to 1 700m3·s-1 with the optimal design.The main reason is that a large longitudinal gradient incurs significant erosion in the spillway before dam breach,resulting in two peak outflow rates of largely reduced values.Comparing to a single trapezoidal spillway,combined spillways have smaller hydraulic radius,which reduces the less erosion and higher water level before dam breach,leading to higher peak outflow rate.Therefore,the risk mitigation effect of combined spillways is not as good as that of a single spillway with the same excavation volume.关键词
堰塞坝/泄流槽/优化设计/峰值流量/复合槽Key words
Landslide dam/Spillway/Optimal design/Peak discharge rate/Combined spillway分类
天文与地球科学引用本文复制引用
石振明,郑鸿超,彭铭,张利民..考虑不同泄流槽方案的堰塞坝溃决机理分析--以唐家山堰塞坝为例[J].工程地质学报,2016,24(5):741-751,11.基金项目
“十二五”国家科技支撑计划（2012BAJ11 B04），国家自然科学基金（41372272，41402257）资助． （）
