The Design and Construction Technology of High-Fill and Deep-Excavation Roadbed Slope for Municipal Road

QIAO Yatao

Abstract：The stability of high-fill and deep-excavation subgrade slopes is of critical importance in the field of municipal road engineering.The alteration of the original topography,landform and geological structure caused by filling and excavation operations renders subgrade slopes susceptible to engineering hazards such as instability and landslides under the long-term influence of natural and anthropogenic factors(e g.atmospheric precipitation,traffic loads).These hazards have the potential to not only hinder the effective use of roads but also pose a significant threat to human life and property.Consequently,there is a compelling need to investigate and develop effective design and construction methodologies for high-fill and deep-excavation subgrade slopes within municipal road infrastructure.The road project of Bayi Avenue was selected as the research object,and the following research methodology was employed:firstly,an analysis of the basic conditions of the area was conducted;secondly,the slope stability coefficient was calculated and determined using slope stability analysis software;thirdly,the layout parameters for anchor rods and anchor cables were designed.During the construction process,BFRP anchor rods were compared with ordinary steel rebars for support,and ecological protection measures such as hanging nets and hydroseeding were implemented.Following construction,the ANSYS finite element software was utilized to simulate and test the safety coefficient of the slope after the implementation of the support and reinforcement structure.The reinforcement support conditions were determined through displacement testing,and a low-temperature environment and precipitation environment were established to verify the construction effect.The simulation results demonstrate that the safety coefficient is higher when the anchor rod length in this support and reinforcement design is 10 meters.The utilization of this support reinforcement design results in the lowest displacement,however,low temperature freezing will increase displacement.Furthermore,even after prolonged exposure to rainwater,this support reinforcement design maintains reasonable stress,ensuring high safety and stability.