Abstract：An elastoplastic finite element program (2D) is developed，in which the processes of foundation pit excavation layer by layer and block by block，culvert construction，and the foundation pit filling by using the method of increasingly adding filling-element gravity and grinding force，are presented respectively. The whole continuous processes of culvert construction including foundation-pit excavation，the body construction，and foundation pit filling，are simulated and investigated. Especially，it shows that the differences of stress field and deformation field between those formed by excavating and natural gravity field are distinct. The results show that the stress field formed by excavation is lower than that of natural gravity field by 10%–18%，and there are some stress concentration zones. The deformation fields are different as following：(1) at the end of the filling，the maximal settlement is located at 1/2 to 1/3 height of fill but not at the top of the fill，which is in good agreement with the results of theoretical analysis；and (2) the maximal lateral displacement is under the foot of slope at a certain depth. It will shift to the central axes of excavation pit with the increment of excavation depth. These results can provide reasonable references to the analysis and design of culvert structure and construction in civil engineering practices.
