库水位变化对路基边坡稳定性的影响研究

Research on Influences of Reservoir Water Level Changes on Stability of Roadbed Slopes

在渗流计算理论与极限平衡方法的基础上,对库水位升降作用下路基边坡的瞬态渗流场与稳定性进行数值模拟与研究。研究结果表明:1)在库水位上升过程中,浸润线位置几乎与库水位的变化"同步",只存在短时间的"滞后"效应;而在库水位下降过程中,滑坡体内浸润线位置严重滞后于库水位的变化。2)库水位上升期间,路基边坡孔隙水压力增加,安全系数增加,最高库水位(175 m)持续期,路基边坡孔隙水压力增加,安全系数缓慢降低;库水位下降期间,路基边坡孔隙水压力降低,安全系数迅速降低,最低库水位(145 m)持续期,路基边坡孔隙水压力降低,安全系数缓慢增加。

Based on seepage calculation theory and limit equilibrium method, this paper carries out numerical simulation and research on transient seepage field and stability of roadbed slopes under the effect of reservoir water level changes. The results of research show that ： 1 ） the position of seepage line is almost ＂synchronous＂ with reservoir water level changes during increase of reservoir water level, and only the ＂lagging＂ effect exists for short time ; while during decrease of reservoir water level, the position of seepage line inside the landslide mass seriously lags behind reservoir water level changes. 2 ） during increase of reservoir water level, water pressure in voids of roadbed slopes increases and safety factor gradually reduces; during increase of reservoir water level, water pressure in voids of roadbed slopes decreases, and safety factor quickly decreases, in persistent period of the minimum reservoir water level （145m） , water pressure in voids of roadbed slopes decreases and safety factor slowly increases.