Research on settlement control technology for construction of shallow-buried railway tunnel under highway
When excavating shallow-buried large-section tunnel under an existing highway,it will easily have adverse effects on the pavement structure of the existing highway,and it may lead to road settlement and even road damage,threatening road operation safety and sabotaging road quality.To explore the principal solutions to this issue,based on the construction practice of blasting excavation of Huangbailing tunnel of Hefei-Fuzhou high-speed railway under Deshang highway,the CRD method,CD method and step method are used to carry out finite elements analysis of the engineering situation respectively,and the relationship among pavement settlement,surrounding rock stress and surrounding rock deformation is explored.The analysis results show that the effect is good when the step method is adopted,and the stratum is reinforced by the combined method of small pipe and pipe-roof combination,combined with the observation of ground settlement and structure section,and the blasting technology is optimized,so as to ensure the deformation and settlement of surrounding rock in a reasonable range during blasting construction,and to ensure the smooth development of construction of this tunnel.
railwaytunnelsettlement controlthrough under highwayCRD methodCD methodstep methodfinite elements analysis
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