In order to adapt to the needs of tunnel construction sites and optimize the technical parameters of tunnel construction according to the level of on-site construction technology,this paper analyzed the impact of bench height on the stability of the tunnel face during two-bench method construction under Class Ⅲ and Ⅳ surrounding rock conditions through theoretical calculations.It proposed a reasonable range for bench height and determined the bench length based on the mechanical equipment used in tunnel construction.According to the research results,it is recommended that when using the two-bench method in better geological conditions of Class Ⅲ and Ⅳ surrounding rock,the bench height should be controlled at 6～8 m,and the length of upper bench should be controlled at 65 m for Class Ⅲ rock and 50 m for Class Ⅳ rock.Field practice has verified that the determined technical parameters of the two-bench method can significantly improve construction efficiency while ensuring construction safety.
railway tunneltwo-bench methodconstructiontunnel face stabilitybench heightlength of upper bench
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