Influence of impounding speed on the seepage state of the core dam under the hydro-mechanical coupling
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Abstract:
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.
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