Abstract The foam system is a key factor affecting the safety, quality, and efficiency of EPBS during metro tunnelling. Using the shield tunnelling on Hangzhou Metro Line 1 as an example, and in light of the existing problems of the foam system-such as control difficulties, inconvenient maintenance, and complicated and dependent systems-relevant improvements are proposed in this paper aimed at achieving complete control and independence of the system. Excellent performance of the improved foam system were verified by comparing its operability, control precision, failure rate, and economic benefits before and after the improvement. Meanwhile, based on the improved foam system and a field test of its construction parameters during shield tunnelling in a silty soil stratum in Hangzhou, the influence of the foam output on cutter torque and advancing speed was analyzed, showing that the improved foam parameters are appropriate for tunnelling in a silty soil stratum.
Abstract：
The foam system is a key factor affecting the safety, quality, and efficiency of EPBS during metro tunnelling. Using the shield tunnelling on Hangzhou Metro Line 1 as an example, and in light of the existing problems of the foam system-such as control difficulties, inconvenient maintenance, and complicated and dependent systems-relevant improvements are proposed in this paper aimed at achieving complete control and independence of the system. Excellent performance of the improved foam system were verified by comparing its operability, control precision, failure rate, and economic benefits before and after the improvement. Meanwhile, based on the improved foam system and a field test of its construction parameters during shield tunnelling in a silty soil stratum in Hangzhou, the influence of the foam output on cutter torque and advancing speed was analyzed, showing that the improved foam parameters are appropriate for tunnelling in a silty soil stratum.
WANG Zhan-1,
WANG You-Yuan-1,
SU Lin-Wang-1 etc
.Improvement of the Shield Foam System and Relevant Field Tests
[J] MODERN TUNNELLING TECHNOLOGY, 2014,V51(6): 179-185
2014, Vol. 51 