不同渗透系数对边坡稳定性影响分析

Analysis of Influence of Different Permeability Coefficient on Slope Stability

蓄水与排水过程中库区水位不断发生变化,沿岸边坡内部地下水位也随之发生变化,边坡不同渗透能力对水位的变化会产生不同的响应,边坡内部渗透后水压力随水位变化而变化,进而促使库岸边坡发生滑塌,影响库岸边坡的稳定性。为此,结合某水电站库岸边坡,通过Geo-Studio软件构建3种不同的渗透系数数值模型,从不同渗透系数对浸润曲线和库岸边坡安全稳定性方面,分析了渗透系数的变化对库岸边坡稳定性变化的影响。研究表明:库岸边坡的浸润曲线变化趋势和渗透系数变化呈现正相关规律,渗透系数越大的边坡在水位上升时浸润曲线的位置变化趋势越来越明显,渗透系数越小的边坡浸润曲线变化趋势越来越接近于不规则曲线,此时边坡内具有较大的水力梯度;渗透系数相同的库岸边坡稳定性在水位上升条件下边坡稳定性增大,在水位下降条件下边坡的稳定性减小,渗透系数越低边坡的安全系数值对库水位变动的反应越迟缓。

During the process of water storage and drainage,the water level in the reservoir area changes continuously,and the groundwater level inside the bank slope also changes accordingly.Different infiltration capacities of the slope will have different responses to the change of the water level.The water level changes,which in turn causes the bank slope to collapse and affects the stability of the bank bank.Therefore,combined with the reservoir bank slope of a hydropower station,three different permeability coefficient numerical models were constructed by Geo-Studio software.Influence of changes in the stability of bank slopes.The results show that the change trend of the infiltration curve and the change of the permeability coefficient of the reservoir bank slope show a positive correlation law,the slope with a larger permeability coefficient has a more and more obvious change trend of the position of the infiltration curve when the water level rises,and the slope with a smaller permeability coefficient is more and more obvious.The trend of the infiltration curve is getting closer and closer to the irregular curve,and the slope has a large hydraulic gradient at this time.The stability of the lower slope decreases,and the lower the permeability coefficient,the slower the response of the safety factor of the slope to the change of reservoir water level.