水位升降速率对河堤边坡稳定性影响及其机理探讨  

Discussion of the influence of water level lifting rate on the stability of river embankment slope and its mechanism

作　　者：吴传余 WU Chuanyu(Anhui Hydrographic Office Pishihang Evaporation Experiment Station,Liuan 237011,China)

机构地区：[1]安徽省水文局淠史杭蒸发实验站,安徽六安237011

出　　处：《水利建设与管理》2018年第3期44-47,22,共5页Water Conservancy Construction and Management

摘　　要：为分析水位升降速率对河堤稳定性的影响,分别计算了不同水位升降速率下河堤安全系数,并基于其应力分布对其形成机理进行初步探讨。结果表明:水位下降时,坡外水压力减小迅速,而坡体内水压减小相对滞后,形成由坡内指向坡外的压力差,增大的坡体下滑力导致河堤库岸边坡不稳定;而水位上升时,垂直坡面向里的渗透力以及坡面的水压力增强了河堤边坡稳定性。The embankment safety coefficient under different water level lifting rates is respectively calculated for the analysis of the influence of water level lifting rate on the stability of embankment.The forming mechanism is preliminarily discussed based on the stress distribution.Results show that the water pressure outside the slope is reduced rapidly during water level falling,the water pressure reduction in the slope relatively lags behind,thereby forming pressure difference from slope internal area to slope external area.The increased slope slide force leads to river embankment slope instability.The river embankment slope stability is enhanced due to the inward permeability from vertical slope and the water pressure on the slope.

关 键 词：岸坡 水位升降 安全系数 稳定性 

分 类 号：TV91[水利工程—水利水电工程]