Analyze the fluid-structure interaction of transient seepage field and stress field of unsaturated cutting slope under different rainfall intensities relying on the cutting slope project of Shanghai-Nantong Railway to discuss the different responses of cutting slope.It focuses on researching the influence of rainfall intensity to the safety factor of slope.The results show that ① the variation trend of the slope vertical displacement is similar.The rainfall intensity has little impact on the vertical displacement of the slope to a certain extent.With the increase of rainfall intensity,the variation trend of horizontal displacement of the slope speeds up and the central horizontal displacement is lagging compared to that of the slope toe.② the horizontal displacement of the slope shows three phases with the increase of rainfall time:initial stable phase,slow change phase and direct ratio change phase.The slope instability resulted from rainfall time should be focused on.③ when the rainfall intensity increases to 18 mm/h from 0,the safety factor of the slope decreases to 1.305 from 1.795,around 27 ％.When the rainfall intensity increases to 18 mm/h from 15 mm/h,the safety factor of the slope decreases by about 16 ％.The larger the rainfall intensity,the greater influence it has to the overall safety of the slope.%以沪通铁路某路堑边坡工程为依托,对非饱和路堑边坡在不同降雨强度下瞬态渗流场与应力场流固耦合进行分析,探讨路堑边坡在不同降雨强度下的响应,重点研究了降雨强度对边坡安全系数的影响.结果表明:①监测点边坡竖直位移随降雨强度变化趋势相似,当降雨达到一定强度时,降雨强度对边坡竖直位移影响较小;随着降雨强度增加,边坡水平位移从缓慢变化过渡到加速变化,且边坡中部水平位移相对坡脚水平位移具有滞后性;②边坡水平位移随降雨时间增加呈现三个阶段:初始稳定阶段、缓慢变化阶段、正比关系变化阶段,应重视降雨时间效应引起的边坡失稳破坏;③降雨强度从0增加到18 mm/h时,边坡安全系数由1.795降低到1.305,降低约27％,降雨强度从15 mm/h增加到18 mm/h,边坡安全系数降低约16％,降雨强度越大对边坡整体安全性影响越大.
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