Abstract
In this paper, the Wushi tunnel of Qingyun Expressway in Guangdong Province is taken as the engineering background, the shallow buried section of mountain tunnel is the area with frequent tunnel diseases, in order to solve the problems of poor self-stability of the excavation surface, destruction of supporting structure and water inrush caused by fully weathered surrounding rock in shallow tunnel, after integrating the treatment technology of the existing fully weathered surrounding rock shallow buried tunnel, pre-reinforcement treatment of fully weathered granite with cover grouting technology on deep surface, the working face is excavated after being pre-supported by a double-layer advanced small pipe and using a new type of self-adhesive waterproof membrane to ensure the waterproof effect of the lining, safe and efficient completion of shallow tunnel excavation, Then backfill the soil of the construction surface to carry out ecological restoration work. Through the study of this process, the construction process flow of the fully weathered surrounding rock shallow buried tunnel is summarized, and the key points of each construction stage are pointed out to ensure the construction quality and optimize the construction technology of the shallow buried section of the mountain tunnel, which provide a reference for other similar engineering problems.
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