水库初次蓄水速度直接影响土石坝的渗流安全，水位上升使得坝体内应力场复杂多变，影响渗流性态，而忽略应力场影响对渗流分析易造成偏差。基于饱和-非饱和土渗流理论，在考虑初始应力场和渗流场的基础上针对蓄水速度对渗流场的影响进行数值模拟，并对比和研究了蓄水过程中考虑和不考虑应力场影响下的渗流性态。结果表明，蓄水速度较慢时，应力对各水力要素影响不明显，提高蓄水速度，心墙上游局部存在较大的水力梯度，孔隙水压力突变并集中分布，对坝体不利，考虑应力耦合影响计算结果偏于安全。因此，初次蓄水渗流分析有必要考虑应力场的影响，并严格控制初次蓄水速度。

The initial impounding speed of a reservoir directly affects the seepage safety of the earth-rock dam. The rise of water level makes the stress field of the dam complicated and fickle, and may affect the seepage state. Ignoring the influence of the stress field in seepage analysis can easily cause some deviation. Based on the saturated-unsaturated seepage theory, with consideration to the initial stress field and seepage field, we analyzed the influence of different impounding speeds on the seepage field using numerical simulation, and then compared and studied the seepage behaviors with or without consideration to the influence of the stress field. The results showed that at a slow impounding speed, the stress had non-significant influence on the hydraulic factors. As the impounding speed increased, there was a large hydraulic gradient in part of the upstream side of the core wall, and the pore water pressure changed abruptly and concentrated, causing harm to the dam. The calculation result leaned towards safe when the influence of seepage-stress coupling was considered. Therefore, it is necessary to consider the influence of the stress field in the seepage analysis of the initial impoundment, and to strictly control the initial water impounding speed.

流域水循环模拟与调控国家重点实验室开放基金项目（IWHR-SKL-201518）