降雨对公路边坡渗流场与稳定性影响研究

降雨是诱发土质公路边坡产生滑坡的主要原因之一。以某公路边坡为研究对象，采用有限元流固耦合方法，定量分析不同降雨强度、降雨历时对公路边坡渗流场与稳定性的影响。结果表明:降雨强度越大，降雨持续时间越长，边坡体积含水量越早达到饱和且达到饱和的范围越大，边坡的基质吸力下降速率越快且消散范围越大，边坡抗剪强度降低越多，稳定性持续下降；当降雨强度达到大暴雨或降雨持续时间达到6天时，该边坡的稳定性系数小于1，有可能失稳，应及时采取防治措施。

Research on Seepage Field and Stability of Highway Slope under Rainfall Conditions

Rainfall is one of the main reasons incurring landslide along highway soil slope. Taking a highway slope as the object, how rainfall in different intensity and duration affects the seepage field and stability of slope was researched quantitatively by means of finite element analysis of fluid-structure coupling. The result shows that, with the greater rainfall intensity and the longer rainfall duration, the volumetric water content of the slope reaches saturation earlier in greater scope of saturation, and the matric suction of the slope decreases at faster speed in greater scope of dissipation, then the shearing strength of the slope reduces more and the stability thereof keeps going down; where the rainfall goes to the intensity of downpour or lasts for 6 days, the stability coefficient is less than 1, and the slope may be unstable and should be adopted in time.