水位动态变化下水体驳岸渗流场及稳定性研究

目前水体驳岸设计只注重景观性与生态性,缺乏水位动态变化对驳岸渗流场及稳定性影响的研究。以澧水河2007-2012年水文地质资料为基础,从驳岸水位动态变化速度、岸坡安全系数两个角度,研究不同水位升降速度的驳岸稳定性变化规律。研究表明:水位动态变化对驳岸渗流场有明显影响,水位变化速度快,驳岸自由水面变化滞后越明显;驳岸水位上升时,其安全系数由大变小再到稳定;随着水位逐渐下降,驳岸安全系数先减小,当水位达到一定高度(此时安全系数最小)时,安全系数逐渐回升。研究结论用以指导水体驳岸设计,对水体驳岸在水位动态变化条件下安全运行具有现实意义。

Revetment seepage field and stability under conditions of dynamic changes of the water level

Current water revetment design focus only on landscape and ecology, there is the lack of study on the influence of the dynamic change of water level on revetment seepage field and the stability. On the basis of hydrogeological data of Lishui River during 2007-2012, from the angle of the rate of change of dynamic revetment level, slope safety factor, the variation law of revetment stability was studied for different rates of rise and fall of water level. Studies show that the dynamic change of water level had significant effect on revetment seepage field. Water level changes fast, free water surface of revetment lags more obviously. When the water level rises in revetment, the stability coefficient is from large to small and then stable. With the gradual decrease of water level, stability coefficient of revetment decreases firstly, when the water level reaches a certain height (minimum stability factor at this time), stability coefficient rises again gradually. The conclusion of the research can be used to guide the water revetment design and has practical significance for the safe operation of the water revetment under conditions of dynamic change of water level.