With the development of city underground space is more and more,Shield method the use of more and more.But tunneling inSand and gravel strata，Large torque, the earth pressure is difficult to control, serious tool wear,tool change danger etc,so brings a lot of difficulties to shield tunnel construction.In order to adapt to the shieldconstruction sand and gravel strata better,In the practical experience of Beijing Haidian 500KV cabletunnel engineeringthree subject of earth pressure balance shield in sandy cobble stratum,Puts forward the concept of bentonitefermentation system and bentonite pump, mortar pump system, the use of saving thebentonite and mortar car, saving theconvergence time, shield tunneling in sandy cobble stratum has a certain role in promoting, the promotion of a certainsignificance.
NETL
NSTL
万方数据
