摘要
为了研究土石坝在洪水作用下的渗流稳定性,依托实际水库工程,以土石坝的坝体为主体,重点考虑洪水、水库、泄洪洞模型输入输出的约束关系,建立了该土石坝洪水过程的结构图仿真模型,并计算得到了在典型洪水过程中水库水位变化曲线;在此基础上采用有限元法,考虑非饱和区的影响,对土石坝非稳定渗流场进行了模拟;利用暂态渗流场计算结果,运用Morgenstern-Price法计算分析了土石坝上、下游坝坡的稳定性。结果表明:上、下游坝坡的稳定系数变化趋势与库水位一致,即坝坡稳定系数随库水位的上升而增大,随库水位的下降而减小。库水位变化的结构图仿真、渗流计算、稳定系数计算构建了较为完整的解决方案,为洪水作用下的土石坝渗流稳定性分析提供了新的手段。
Seepage stability is the key factor to earth-rockfill dam safety under flood. Based on an actual project,the block diagram simulation model of the earth-rockfill dam is established considering the complex input-output constraint relations among the flood, the reservoir and the spillways. Then the changing process of the reservoir level is simulated during the typical flood. On the basis of the computed curve of the reservoir levels, the finite element method is adopted to simulate the unstable seepage field of the dam considering the non-saturated region.Finally, the stabilities of the upstream and downstream dam slope are analyzed by Morgenstern-Price method, and the corresponding stability coefficients under different reservoir levels are obtained. The results show that the changes of the stability coefficient of the upstream and downstream dam slopes coincide with the rising and falling of the reservoir water level. The integrated scheme including the block diagram simulation of the reservoir level,seepage and stability computation, provides a new approach for analyzing the seepage and stability of earth-rockfill dams under the flood condition.
出处
《应用力学学报》
CAS
CSCD
北大核心
2014年第1期110-115,10,共6页
Chinese Journal of Applied Mechanics
基金
教育部新世纪优秀人才支持计划(NCET-12-0404)
国家创新研究群体科学基金(51021004)
国家自然科学基金(51379006)
关键词
土石坝
渗流
稳定性分析
洪水
结构图仿真
earth-rockfill dam
seepage
stability analysis
flood
block diagram simulation.
