Study on the stability of subgrade slope under graded excavation and rainfall conditions

In order to analyze the stability of subgrade slope and explore the deformation and failure mechanism of slope, so as to guide the dynamic construction of expressway engineering and ensure the safety of construction site and the safe operation of highway. In this paper, PLAXIS 2D finite element analysis model is established based on the slope classification excavation project of Yuxiang double line expressway project, and the stability of slope classification excavation and rainfall conditions is studied. The calculation results show that: 1) After two excavations, the soil on the top of the slope is reduced and the safety factor of the slope is improved; After two excavations, the soil on the top of the slope is reduced and the safety factor of the slope is improved. 2) In the aspect of excavation, the protection setting of window-hole retaining wall is unreasonable, and the plastic points of soil near the anti-slide pile are concentrated, which may lead to plastic failure. 3) Under rainfall conditions, the overall deformation of the slope develops towards the toe of the slope. During the construction process, temporary protection should be set at the toe of the slope.