摘要
针对杭新景高速公路粗粒土斜坡路堤在雨后产生不均匀沉降以及失稳破坏的问题,基于饱和-非饱和渗流理论,结合相关试验数据以及气象资料,采用数值软件分析了降雨入渗条件下粗粒土斜坡路堤渗透特性、稳定性以及沉降变形的变化规律。研究结果表明,基岩倾角越大,粗粒土斜坡路堤中越容易产生正孔隙水压力;不同的基岩倾角下,粗粒土斜坡路堤的安全系数都随降雨的持续而降低,当降雨停止后安全系数又迅速恢复;基岩倾角越大,相同条件下斜坡路堤的安全系数越低,降雨对粗粒土斜坡路堤安全系数的影响越小;粗粒土斜坡路堤的最大沉降值随着基岩倾角的增大而增大。
In order to analyze the uneven settlement and instability of coarse-grained soil of embankment upon slopes in Hangxinjing expressway, based on the saturated-unsaturated seepage theory and combined with relevant experimental data and meteorological data, coarse-grained slopes＇seepage characteristics and change of stability under rainfall infiltration are analyzed using numerical software. Research indicates the greater the inclination of the bedrock, the more prone to the positive pore water pressure in the coarse grained embankment. In different bedrock inclination, the safety factor of the coarse grained soil em- bankment decreases with the rainfall, after the rain stopped, the safety factor quickly restored. The greater the inclination of bedrock, the lower the safety factor of slope embankment under the same conditions. The greater the inclination of bedrock, the smaller the effect of rainfall on the safety factor of coarse-grained soil of embankment upon slopes. The maximum settlement value of coarse-grained soil of embankment upon slopes increases with the inclination of bedrock.
出处
《长沙理工大学学报（自然科学版）》
CAS
2017年第1期17-23,共7页
Journal of Changsha University of Science and Technology:Natural Science
基金
国家自然科学基金资助项目(51508042
51678073
51508040
51578079)
湖南省重点研发计划项目(2016SK2023)
关键词
降雨入渗
粗粒土
斜坡路堤
路堤渗透特性
路堤稳定性
rainfall infiltration
coarse-grained soil
embankment upon slopes
seepage characteristics of embankment
embankment stability
