关键词: 道路工程, 加筋土挡墙, 土工格栅, 变形, 蠕变效应, 有限元分析

Abstract:

In order to explore the long-term performance of the geogrid-reinforced soil retaining walls and the softsoil ground under combined action,the creep properties of the geogrid and the soft soil were investigated throughcreep tests,and a constitutive model considering the creep effect was established based on experimental results.Then,a case study on a geogrid-reinforced soil retaining wall built on soft soil ground was performed by using the finiteelement method,and the long-term deformation performance of the wall considering the creep effect of reinforcementmaterial was analyzed.The results show that ( 1) the proposed numerical model is effective in simulatingthe long-term creep behaviors of the reinforced soil retaining wall on soft soil ground; ( 2) the lateral displacementof the reinforced wall gradually increases with time and becomes larger at the central part but smaller at the twoends of the wall; ( 3) with the prolonging of time,the position of maximum lateral displacement along the wall becomeshigher; and ( 4) due to the influence of foundation deformation,the positions of maximum tension and strainof each geogrid layer are different from the Rankine failure surface stated by the current design theory.In addition,the distribution law of geogrid tension and strain along the wall at different times,which is obtained by numericalsimulation,provides some references for the design of reinforced soil retaining walls on soft soil ground.

Key words: road engineering, reinforced soil retaining wall, geogrid, deformation, creep effect, finite element analysis