带加强节点土工格栅加筋路堤动力响应的颗粒流分析

Analysis of Dynamic Response of Embankment Reinforced with Geogrid with Strengthening Nodes Based on PFC2D

采用基于离散元理论的颗粒流软件建立了路堤二维数值模型,研究了交通荷载下无筋路堤、普通土工格栅加筋和带加强节点土工格栅加筋路堤的不同动力响应.通过比较不同工况的位移矢量图和颗粒接触力分布情况,发现由于加强节点的存在,带加强节点的土工格栅比普通土工格栅能更有效地减少路堤顶部的累积沉降,限制边坡的隆起;相比无筋路堤,加筋路堤的加载板正下方颗粒接触力集中形成柱状承载结构,能够有效地将上部荷载均匀传递给下部土体.

The embankments were simulated by the software of particle flow code based on the discrete ele- ment theory. Different dynamic responses were investigated in the cases of unreinforced embankment, em- bankment reinforced with traditional geogrid and embankment reinforced with geogrid with strengthening nodes. The displacement fields and the distribution of contact forces of soil particles in three cases were an- alyzed. Compared to the embankment reinforced with traditional geogrid, due to the existence of the strengthening nodes, the geogrid with strengthening nodes can effectively reduce the accumulated settle- ment of the embankment and restrict the lateral displacement of the slope. In the case of reinforced em- bankment, multiple vertical force-bearing columns develop below the loading platen, resulting in uniformly distributed forces within the embankment.