某一级公路半填半挖段路基稳定性仿真研究

Simulation Study on Stability of Semi-filled and Semi-excavated Subgrade of a First Grade Highway

随着公路建设的发展,半填半挖路基工程越来越多,其稳定性研究越来越受到科研人员的关注。为了保障某一级公路半填半挖段路基施工安全,从路基稳定性影响因素入手,对路基稳定性的评价方法进行了介绍,并采用Plaxis有限元软件,就路基填筑高度对该边坡稳定性的影响进行了数值模拟研究。得到以下主要结论:随着填筑高度增加,增量位移从填土路基外逐渐向填土路基内转移,最终逐渐发展为一条光滑的圆弧,该圆弧即为路堤边坡失稳时的破裂面;当填筑高度小于12m时,破裂面位于填挖交界面附近,之后随着填筑高度增加,破裂面上移至填土路堤内部;当填筑高度达20m时,破裂面发展成为一条坡顶至坡底的狭长圆弧面。

With the development of highway construction,more and more semi-filled and semi-excavated subgrade projects have been built,and the research on its stability has attracted more and more attention from researchers.In order to protect the safety of the construction of a first grade highway,This paper starts with the influencing factors of roadbed stability,the evaluation method of roadbed stability is introduced,and,the influence of filling height on stability of roadbed slope is studied by Plaxis software.The main conclusions are as follows:With the increase of filling height,incremental displacement is transferred from outside to inside of the filling roadbed,and eventually develops into a smooth circular arc,which is the rupture surface of the embankment slope when it is unstable;When the filling height is less than 12 m,the fracture surface is located near the filling-excavation interface.Then,with the increase of filling height,the fracture surface moves to the interior of the filling embankment.When the height of filling reaches 20 m,the fracture surface develops into a circular arc surface.