The Chengmen Station of Fuzhou Metro Line 4 is 90 ° orthogonal to the Chengmen Station of the existing Line 1.There are three major difficulties in the construction of the main structure:zero distance under-crossing of the existing line,crossing of strata containing weak confined water,and large cross-section excavation construction.Taking the construction of the main structure of the project as an ex-ample,this paper analyzes the difficulties and countermeasures of the frozen excavation method in crossing existing lines at zero distance from the aspects of frozen curtain design,support design,structural grouting,and thawing settlement compensation.Practice has shown that the use of horizontal frozen water stop curtain,CRD mining method,and horizontal grouting reinforcement method for the implementation of frozen underground excavation construction in this project was successful,which provide a reference for similar engineering frozen excavation construction.
metro stationmain structureunder-crossing existing linefreezing underground excavation
维普
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