水位变化对浸水拓宽路基渗流特征和稳定性的影响  

Impact of Water Level Changes on Seepage Characteristics and Stability of Soaking Widened Subgrade

作　　者：李芬[1] 刘亦韬 赵澳权 LI Fen;LIU Yitao;ZHAO Aoquan(School of Naval Architecture,Ocean and Energy Power Engineering,Wuhan University of Technology,Wuhan 430063,China;Anhui Jianghuai Automobile Group Co.,Ltd.,Hefei 230022,China)

机构地区：[1]武汉理工大学船海与能源动力工程学院,湖北武汉430063 [2]安徽江淮汽车集团股份有限公司,安徽合肥230022

出　　处：《郑州大学学报(工学版)》2025年第2期127-134,共8页Journal of Zhengzhou University(Engineering Science)

基　　金：国家自然科学基金资助项目(52178353)。

摘　　要：沿河路基长期受单侧水位变动的影响,会加大路基整体失稳的风险。为分析浸水拓宽路基在水位季节变动情况下的渗流特征和稳定性,基于FLAC 3D软件的二次开发实现对路基渗流特性的实时计算,并在此基础上对土体强度参数进行修正,研究水位季节变动对拓宽路基稳定性的影响。结果表明:在路基近水面一定区域内,不同时间相同水位下路基孔隙水压和饱和度曲线随水平距离的分布规律不同;高水位期其曲线形成类似滞回圈形态,中间区域的孔隙水压和饱和度在水位下降期大于水位上升期;低水位期其曲线在一定深度处交汇,但近水区域的孔隙水压和饱和度在水位下降期大于水位上升期;迎水面边坡安全系数随水位季节变化变动幅度较大,最大达22%,背水面受其影响较小,变化幅度仅为4.5%;迎水面边坡安全系数变化趋势与水位季节变化趋势成呈相关,背水面则截然相反;水位季节性涨落过程中,最不利工况在水位达到峰值时出现,潜在滑动面出现在背水面新旧路基结合处。The subgrade along the river was affected by unilateral water level changes for a long time,which could increase the risk of overall instability of the subgrade.In order to analyze the seepage characteristics and stability of the flooded widened subgrade with the condition of seasonal change of water level,the seepage characteristics of the subgrade were calculated in real time based on the secondary development of FLAC 3D software,and the soil strength parameters were corrected on this basis,and the influence of seasonal change of water level on the stability of the widened subgrade was studied.The results showed that the distribution of pore water pressure and saturation curves of subgrade with horizontal distance was different at the same water level at different times in a certain area near the water surface of the subgrade.During the high water level period,the curve formed a hysteresis circle-like shape,and the pore water pressure and saturation in the middle region were greater than those in the water level rise period.In the low water level period,the curves converge at a certain depth,but the pore water pressure and saturation in the near water area were greater than those in the water level rise period.The safety factor of the frontal slope varied greatly with the seasonal change of water level,with a maximum of 22%,while the backwater surface was less affected by it,with a variation of only 4.5%.The change trend of safety factor of frontal slope was positively correlated with the seasonal trend of water level,while that of backwater surface was diametrically opposite.In the process of seasonal fluctuations of water level,the most unfavorable condition occurred when the water level reached its peak,and the potential sliding surface appeared at the junction of the old and new subgrade on the backwater.

关 键 词：拓宽路基 水位变化 渗流特征 稳定性 

分 类 号：U416.1[交通运输工程—道路与铁道工程]