Research on Safety Control Technology of Subway Transverse Channel Excavation in Ultra-shallow Buried Water-rich Sand Layer
This paper proposes a full-section pre-grouting reinforcement method of"advance pipe shed+horizontal drilling in and out of the tunnel advanced sub-grouting",which is suitable for the construction of urban subway sand underground transverse passages.The slurry con-struction is completed outside the cave,and does not intersect with the excavation construction in the cave,which greatly improves the con-struction efficiency.Numerical simulation is used to analyze the displacement field and stress field change law of surrounding rock under differ-ent grouting reinforcement thickness and excavation step by CRD method,and reasonable construction parameters are proposed and successfully applied to the sand excavation of a transverse channel.The results show that the surface deformation control effect of this scheme is good,and the construction efficiency can be improved.
Ultra shallow buried weak strataAdvance pre groutingNumerical analysisOn site monitoring
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