冻结层上水渗流对斜坡稳定性影响分析  

Influence of suprapermafrost water seepage on the stability of the frozen sloping embankment

作　　者：张进元 Zhang Jinyuan(Qinghai Communication Holding Construction Engineering Group Co.,Ltd.,Xining 810000,China)

机构地区：[1]青海省交控建设工程集团有限公司,西宁810000

出　　处：《青海交通科技》2024年第1期46-52,共7页Qinghai Transportation Science and Technology

基　　金：青海省科技计划项目(2023—SF—125)。

摘　　要：为了研究冻土斜坡路基中冻结层上水渗流对斜坡稳定性的影响,本文基于强度折减法、莫尔—库仑屈服准则和达西定律建立数值模拟模型,对路基修筑前后、缓坡陡坡工况下的冻结层上水渗流场和土体变形进行了模拟计算。结果表明:路基修筑改变了渗流路径和渗流速度。受路基传热的影响,路基下多年冻土产生融化,冻土上限有所下降并形成融化槽。冻土上限界面是潜在的滑移面,斜坡坡度越大,多年冻土上限融化下降的深度越大,产生塑性变形而滑动失稳的可能性越大。建议做好路基排水,避免水分在路基坡脚聚集,以提高路基稳定性。In order to study the influence of the suprapermafrost water seepage on the stability of the frozen sloping embankment,a numerical simulation model based on strength reduction method,Mohr-Coulomb yield criterion and Darcy’s Law was established to simulate the water seepage and soil deformation in frozen layer before and after the embankment construction.The simulation process was conducted on a finite element software.The results show that the embankment construction changes the seepage path and the seepage path has been prolongated,the seepage velocity has been slow down.Affected by the heat transfer of the embankment,the permafrost underneath the embankment has been melt,and the permafrost table drops down and forms a melting trough.The area around the permafrost table is the potential slip region.The greater the slope angle,the greater the thaw depth,and the greater the possibility of plastic deformation and sliding instability.In order to improve the stability of the embankment,it is recommended to do a good job of embankment drainage to avoid water accumulation at the foot of the embankment slope.

关 键 词：多年冻土 斜坡路基 冻结层上水 渗流 强度折减法 

分 类 号：U416.168[交通运输工程—道路与铁道工程]