In order to meet the increasing traffic demand,highway reconstruction and expansion projects are gradually increasing,and reducing the uneven settlement of the new and old roadbed is the key to ensure the road quality and safety.In order to study the influence of different construction schemes on the settlement of new and old roadbed,PLAXIS 3D was used to establish a numerical model of roadbed,and numerical analysis was carried out on the construction schemes of geogrids,excavation steps and soil reinforcement under new roads.The influence of each parameter on road settlement was studied,and optimization and safety analysis of each construction parameter was carried out to ensure the economy and safety of roads.
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