Abstract Aiming at the problems encountered in the Chengdu metro construction driven by a shield machine in a sandy cobble stratum (such as smaller shield torque; serious wear of the cutter, cutterhead and screw conveyor: poor muck conditioning; and obvious post-construction settlement), some countermeasures are carried out to improve the design of the CREC-TBM. These measures include a reasonable main drive torque and precise penetration in order to avoid the risks of an automatic reduction of speed and effectively prevent the cutterhead from getting stuck. Attributed to the good design and arrangement of the cutterhead and cutter, muck accumulation and muck cakes are reduced, thereby benefiting muck mixing. With sound muck conditioning, cutter wear and replacement frequency are reduced and the driving distance is extended accordingly. The results show that the CREC-TBM is suited to construction in the water-rich sandy cobble stratum, with post-construction settlement meeting the relative specifications.
Abstract：
Aiming at the problems encountered in the Chengdu metro construction driven by a shield machine in a sandy cobble stratum (such as smaller shield torque; serious wear of the cutter, cutterhead and screw conveyor: poor muck conditioning; and obvious post-construction settlement), some countermeasures are carried out to improve the design of the CREC-TBM. These measures include a reasonable main drive torque and precise penetration in order to avoid the risks of an automatic reduction of speed and effectively prevent the cutterhead from getting stuck. Attributed to the good design and arrangement of the cutterhead and cutter, muck accumulation and muck cakes are reduced, thereby benefiting muck mixing. With sound muck conditioning, cutter wear and replacement frequency are reduced and the driving distance is extended accordingly. The results show that the CREC-TBM is suited to construction in the water-rich sandy cobble stratum, with post-construction settlement meeting the relative specifications.
CAO Zhi
.The Application of CREC-TBM to the Chengdu Metro Construction
in a Sandy Cobble Stratum
[J] MODERN TUNNELLING TECHNOLOGY, 2014,V51(2): 127-132
2014, Vol. 51 