Influence on a Bank Slope Accumulations' Stability of the Rising or Falling Speed of a Reservoir Water Level
Influence on a Bank Slope Accumulations' Stability of the Rising or Falling Speed of a Reservoir Water Level
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发表时间：
2011
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通讯作者：
Huang Run-qiu
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作者：
Huang Run-qiu
库水位升降过程中，岸坡堆积物渗流及稳定性的变化是一个动态过程。采用有限元法与平衡分析相结合的方法，分析了库水位升降速度对堆积物渗流及稳定性影响的作用机理和规律。分析结果表明，库水位升降速度对堆积物渗流及稳定性影响较大堆积体的瞬态渗流特征明显，水位上升速度越快越有利于堆积体的稳定性，但下降速度越快越不利于堆积体的稳定性，下降速度从0.5 ~ 5 m/d增加，堆积体的稳定性系数降低15%~20%，最危险水位一般位于堆积体底部以上堆积体高度的1/3 ~ 1/5处。
The change of the bank slope accumulations'seepage and its stability is a dynamic process during the period of rising or falling of reservoir water level.The combination of the FEM method and equilibrium analysis was applied to analyze the action mechanism and laws of the water level's rising and falling speed effect on accumulations'seepage and stability.The analysis results showed that the water level's rising and falling speed can influence the congeries's transient seepage obviously,and faster rising speed of water level is favorable to the accumulations'stability.But the faster falling speed is unfavorable,and the stability coefficient will reduce by 15%~20% with the falling speed increased from 0.5 to 5 m/d,and the most dangerous water levels are commonly located at one-third to one-fifth of the congeries's height up the accumulations' bottom.