In large-diameter shield tunneling,navigating through complex strata such as muddy clay,silty clay,sandy clay,and the seismic fault zones of rivers presents significant challenges.One major cause of quality issues is the buoyancy of the segments.Based on theoretical analysis,it is recommended to employ double-liquid grouting technology during synchronous grouting.This approach has shown remarkable practical effects and high technological content.Comparative monitoring before and after grouting indicates minimal surface settlement,effective pressure maintenance,reduced segment buoyancy,and negligible misalignment,with no other abnormal conditions observed.This validates the safety and feasibility of the synchronous grouting technique used in shield tunneling projects.
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