水位下降对裂隙性路基边坡稳定性影响机理分析

为揭示水位下降对裂隙性路基边坡稳定性的作用机理,基于饱和-非饱和渗流理论,研究了裂隙深度、裂隙开口宽度、裂隙分布位置、库水位下降速率等对裂隙性边坡稳定性的影响。结果表明:裂隙越深,饱和区域越大,边坡稳定性越低;裂隙开口宽度的大小对稳定性的影响不大;裂隙分布在坡面和坡底时稳定性较低;库水位下降速率主要影响裂隙层达到饱和的快慢,对边坡的长期稳定性的影响则可忽略;裂隙边坡稳定性随库水位不断下降而减小,当库水位水位较低或稳定后,其安全系数基本不变。在库水位下降直至稳定过程中,安全系数无裂隙边坡始终大于裂隙边坡。

Influence Mechanism Analysis of Water Level Depression on the Stability of Fractured Subgrade Slope

In order to expose the action mechanisms of water level depression on the stability of fractured subgrade slope,the influencing factors of the stability of fractured subgrade slope including fracture depth,opening width,distribution position,reservoir water level lowering rate are analyzed based on saturated-unsaturated seepage theory.The results show that deeper fracture and larger saturated area lead to lower slope stability.Fracture width has little influence on stability.The stability is lower when fracture spreads in the surface and the bottom of slope.The lowering rate of reservoir water level mainly affects the velocity of fracture layer to reach at saturated condition and has little influence on long-term stability of slope.Fractured slope stability decreases with the falling of water level.When the water level is lower or stable,its safety factor remains unchanged.During water level lowering until stable,the safety factor of non-fractured slope is still larger than that of fractured slope.