Abstract：
Enlarging shield tunnel internal launching excavation method was adopted in construction of a middle air shaft along a Guangzhou subway line interval. Considering that this method has much higher risks than tunnel external vertical shaft launching excavation, stratum pre-strengthening was carried out in advance to ensure the safe dismantlement of duct pieces. Enlarging shield tunnel blasting excavation technique was adopted to successfully solve difficulties in rock stratum excavation and quicken the excavation speed.
ZHOU Yong-qu,PENG Fei. Study on Launching Excavation and Blasting Excavation Construction
Techniques in Enlarging Shield Tunnel[J]. Architecture Technology, 2018, 49(11): 1177-.
