库水位上升条件下边坡渗流场模拟

库水位的上升将导致边坡体内渗流场的变化,进而引起边坡的失稳破坏。边坡体内的渗流场是饱和渗流与非饱和渗流共同作用的结果,通过对库水位上升过程中坡体内地下水位线的位置变化及相应的渗流场参数的计算表明:由于上部松散堆积体与基岩渗透系数的差异,基岩内地下水位线的抬升速度明显滞后于上部松散堆积体;体积含水量、压力水头、流速和水力梯度等渗流参量在基岩中的变化幅度较小,而在上部松散堆积体中的变化幅度则相对较大。这说明库水位上升对上部松散堆积体的影响相对来说还是比较明显的。

SIMULATION OF SEEPAGE FIELD IN BANK SLOPE DUE TO RESERVOIR WATER LEVEL CHANGE

Reservoir water level change can change the seepage field in the bank slope of the reservoir, and further cause the instability and failure of the slope. The seepage field in the slope can be divided in saturated and unsaturated seepage fields. The paper presents the calculated results of the position change of the underground water level line and the corresponding seepage field parameters. The results show that the rising velocity of the underground water level line in the bedrock evidently lags that in the upper loose deposit. This difference is due to the difference of the permeability coefficients between upper loose deposit and the base rock. The variation magnitudes of the seepage parameters such as the volume content, the pressure head, the flow velocity and the hydraulic gradient in the bedrock are rather smaller than those in the upper loose deposit. It indicates that the influence of the reservoir water level rise on the upper loose deposit is much more evident.