软弱地层盾构渣土制备同步注浆浆液及工程应用

Shield Muck Generated from Soft Soil Stratum for Preparation of Grouting Material and Its Engineering Applications

依托苏州市轨道交通8号线隧道工程,采用软弱地层盾构渣土制备同步注浆浆液以减少渣土排放。基于室内试验,测试了渣土浆液的强度、初凝时间、稠度、泌水率等指标,并通过现场试验,将渣土浆液用于盾构隧道壁后注浆。结果表明:渣土浆液能够满足同步注浆浆液性能要求,软土地层盾构渣土可以通过调节配比等方法改善其性能,证明了利用软土地层中土压平衡盾构渣土制备同步注浆浆液的可行性。渣土浆液已用于苏州轨道8号线盾构掘进过程中同步注浆,能较好地控制盾构沉降及管片上浮。盾构渣土制备同步注浆浆液可减少每公里盾构成本约75万元,降低10%渣土排放量,具有良好的经济和环保效益。

Based on the Suzhou Rail Transit Line 8 subway project,the synchronous grouting slurry was prepared using shield muck generated from soft clay stratum to reduce slag discharge.Based on lab testing,the strength,initial setting time,consistency,bleeding rate,etc.of the shield muck-produced grouting slurry were evaluated.Through engineering practice,the shield muck produced grouting slurry was used for grouting during shield excavation.The results show that the shield muck-produced grouting slurry met the performance requirements for synchronous grouting,and the performance of the muck-produced slurry could be improved by adjusting the mix ratio,demonstrating the feasibility of using soil pressure balance shield muck in soft soil strata to prepare synchronous grouting slurry.The slurry has been used for synchronous grouting during the excavation of the shield in the Suzhou Rail Transit Line 8 project,and the shield settlement and uplift value of lining segments are well controlled.Using shield muck for the preparation of grouting material can reduce the tunnel cost by approximately 750 thousand Yuan per kilometer and decrease the soil discharge by 10%,achieving considerable economic and environmental benefits.