Study on the Reuse of Slurry Shield Waste Slurry in Sandy Cobble Stratum for Synchronous Slurry
To solve the problem of difficult treatment of a large amount of waste slurry generated during the construction of slurry balanced shield and the high cost of synchronous grouting of shield,it is proposed to reuse the waste slurry generated by slurry balanced shield to prepare synchronous grouting slurry.Relying on the Zirui Tunnel Project of Chengdu Pujiang Railway,which mainly crosses sandy cobble stratum,this research studies the influence of slurry cement ratio(waste slurry to cement mass ratio)and slurry sand ratio(waste slurry to sand mass ratio)on the performance of synchronous grouting slurry.In addition,based on the reuse of waste slurry to prepare synchronous grouting slurry,the feasibility of replacing part of cement with refractory slurry is studied.The results show that:1)with the increase of the slurry cement ratio of synchronous grouting slurry,the fluidity of synchronous grouting slurry increases,the setting time prolongs,and the 28d compressive strength of the cube decreases;2)with the increase of slurry sand ratio,the fluidity of synchronous slurry increases,the setting time prolongs,and the 28d compressive strength of cube decreases;3)the addition of refractory mud will increase the compressive strength of synchronous grouting slurry,reduce the fluidity of synchronous grouting slurry and shorten the setting time of synchronous grouting slurry.Therefore,it is feasible to replace part of cement with refractory mud in the preparation of synchronous grouting slurry,and it can bring certain economic benefits.
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