Key Construction Techniques of CSM Overall Water-resisting Curtain in Upper-soft and Lower-hard Stratum
In upper-soft and lower-hard stratum with rich water environment,the construction quality of the water-resisting curtain of excavation directly affects the safety and deformation control of the excavation.Based on the deep and large excavation project of the Zhoucun Station of Qingdao Metro Line 7,this paper explores the key construction techniques of the CSM method to form an overall water-resisting curtain from the perspectives of construction machinery,construction methods,and information technology.The study was conducted systematically on the selection and configuration of CSM cutterhead,the determination of material mix proportions through trial wall tests,the multipoint grouting technology and grouting parameters of double wheel trench cutter,methods of slurry preparation and storage,method of jump-and-stack looping construction,and the information monitoring method for the entire CSM drilling process.Based on the field monitoring results,the depth of the cement soil wall of the CSM method exceeds the design wall depth by 0.5%.The maximum drawdown of the peripheral water level during the excavation of the excavation is 1.5m,and the maximum settlement value of the right adjacent provincial road is 13.1mm.The excavation of the excavation is safe.The results show that the CSM integral waterproof curtain has strong adaptability and good wall quality.
subwaysexcavationupper-soft and lower-hard stratumCSM methodwater-resisting curtain
NETL
NSTL
万方数据
