ABSTRACT
The deformation of the adjacent road structure during the construction of the proposed tunnel project and after it is completed and put into use is analyzed through the three-dimensional and two-dimensional numerical simulation calculation of the typical section, and the safety of the adjacent road structure is evaluated. The analysis results show that the excavation and construction of the adjacent road slope only cause stress changes in its local scope and have little impact on the stress of the follow-up ramp tunnel implementation scope. It can be considered that the excavation of the adjacent road slope does not affect the surrounding rock conditions of the later ramp tunnel implementation. After the excavation and construction of the side slope adjacent to the road are completed, the tunnel can meet its stability under the support conditions during the subsequent tunnel excavation. The deformation caused by the subsequent tunnel construction is only in the local area around the tunnel and has little impact on the deformation of the retaining wall. Therefore, the ramp tunnel construction is safe and has little impact on the adjacent road retaining wall, meeting the requirements.
