Based on the large-scale mechanized construction of Chengzaishan Tunnel in the reconstruction and expansion project of Shenshan West Expressway, the characteristics and limitations of the mechanized double-side heading method and the mechanized bench cut method were analyzed, proposing the conversion technology of the double-side heading method to the bench cut method. Through numerical simulation of settlement and stress, the feasibility and safety of the conversion technology were analyzed. The results showed that the whole construction conversion process is relatively stable, the structure of advanced support and tunnel support is reasonable, and there is no safety hazard, which can provide some guidance for on-site construction.
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