Abstract：
In the first instance of cutting a pile group in front of a shield using the mined method in a soft plastic flow stratum, the alternative construction in terms of mined excavation and pile cutting is very risky and difficult.Based on a shield tunnel section from the Daminglu station to the Mingfa Square station, which passes underneath the Jiagang street box culvert, and with respect to the characteristics and restricted conditions of the pile group and shield-driven tunnel, it is recommended that the upper tunnel section is excavated by mined method and enclosed at first, and then the shaft is constructed followed by the other lower tunnel section, as well as a pile cutting technique with combination of the splitter and pneumatic pick is adopted. By using these key construction techniques,construction period is shortened and some risks are eliminated, such as: large soft soil deformation due to excavation, large vibrations in pile cutting, and the work face collapse due to long exposure time.
.Key Technology for Cutting a Pile Group in Front of a Shield in Soft Plastic Flow Strata by Mined Excavation Method[J] MODERN TUNNELLING TECHNOLOGY, 2018,V55(2): 194-200
2018, Vol. 55 