Study on Stability of Embankment Slope under Different Drawdown Conditions
In order to study the influence of water level drawdown speed on the stability of embankment slope,this paper selects a section of the Songhua River embankment section as a model test design section.Through indoor model tests,the displacement,pore water pressure and earth pressure of embankment slope under different water level drawdown speeds are monitored by using automatic terrain measurement system and high-precision sensors,At the same time,Geo-Studio software was used to analyze the infiltration line and stability of embankment slopes under different water level drop rates.Research shows that:The total soil water stress and pore water pressure inside the embankment decrease with the decrease of water level,and the decrease rate increases with the increase of water level decrease rate.The decrease amplitude near the upstream slope surface is greater than that inside the slope body,and the effective stress shows an upward trend.When the water level drops to the bottom of the slope,the decrease rate of total soil water stress and pore water pressure begins to gradually decrease.The location where the maximum settlement occurs on the upstream slope of the embankment is mainly concentrated near the boundary between the water level and the slope.There is a significant arch displacement in the middle of the slope,and as the water level decreases,both the maximum settlement and arch displacement of the slope show an increasing trend.The stability coefficient of the embankment slope first rapidly decreases with the decrease of water level,and the decreasing speed of the stability coefficient increases with the increase of water level decreasing speed.When the water level drops to the foot of the slope,the stability coefficient of the slope gradually increases,and then tends to remain unchanged.The stability coefficient of the slope ultimately reaches the same level under different water level decreasing speed conditions.
embankment slopethe rate of water level declinemodel testingnumerical simulationslope stability
NETL
NSTL
万方数据
维普
