降雨和河流水位上升作用下沿河路基边坡稳定性研究

Study on the Stability of Subgrade Slope along the River under the Action of Rainfall and River Water Level Rise

由于山区气候多雨,强降雨和河流水位快速上升等现象时常发生,在复杂多变的降雨及河流水位作用下路基边坡极易发生失稳破坏。为了掌握降雨和河流水位上升对边坡稳定性的作用机理,确保沿河公路的安全运营,采用Midas-GTS/NX有限元分析软件建模,针对3种不同降雨工况和2种坡前水位上升速率进行边坡稳定性分析,并根据稳定性研究结果,提出坡面防渗措施。结果表明:1)降雨强度、坡前河流水位上升速率与边坡的稳定性呈负相关;2)在坡面铺设防水层可有效减少雨水渗入,提高边坡的安全系数及稳定性。

Due to the occurance of rainy climate in mountainous areas,phenomena such as heavy rainfall and rapid rise of river water level,and the roadbed slope is prone to instability and damage under the action of complex and changeable rainfall and river water level.In order to grasp the mechanism of rainfall and river water level rise on slope stability and ensure the safe operation of riverside highways,Midas-GTS/NX finite element modeling was used to analyze slope stability for three different rainfall conditions and two preslope water level rise rates,and according to the stability research results,slope seepage prevention measures were proposed.The results show that:1)The rainfall intensity and the water level rise rate of the river before the slope are negatively correlated with the stability of the slope;2)Laying a waterproof layer on the slope can reduce rainwater infiltration and improve the safety factor and stability of the slope.