Abstract As for the shield construction in shallow-buried tunnels with ultra-small spacing, taking the double-line shield tunnel construction of the western bid section of the Tel Aviv Red Line light rail project as the engineering background, this paper conducts a systematic study on various aspects such as tunnel reinforcement construction,shield driving control, monitoring control and emergency management, etc. The results show that reinforcement construction is crucial in the shield tunnelling with small spacing, which can effectively reduce the tunnel construction risks; for the shield construction in unreinforced tunnels with small spacing, the earth pressure should be kept steady with strengthened fine control; the volume of mucking should also be strictly controlled with good soil conditioning, and the ground loss rate should be curbed under 0.3%; injection of bentonite or clay shock to the outside of the shield shell can effectively reduce the displacement of the adjacent tunnel; the backfill grouting volume and quality should be controlled with consideration to the real-time monitoring data; and during the tunnel construction process, adjacent existing buildings should be monitored with strengthened vigor.
Abstract：
As for the shield construction in shallow-buried tunnels with ultra-small spacing, taking the double-line shield tunnel construction of the western bid section of the Tel Aviv Red Line light rail project as the engineering background, this paper conducts a systematic study on various aspects such as tunnel reinforcement construction,shield driving control, monitoring control and emergency management, etc. The results show that reinforcement construction is crucial in the shield tunnelling with small spacing, which can effectively reduce the tunnel construction risks; for the shield construction in unreinforced tunnels with small spacing, the earth pressure should be kept steady with strengthened fine control; the volume of mucking should also be strictly controlled with good soil conditioning, and the ground loss rate should be curbed under 0.3%; injection of bentonite or clay shock to the outside of the shield shell can effectively reduce the displacement of the adjacent tunnel; the backfill grouting volume and quality should be controlled with consideration to the real-time monitoring data; and during the tunnel construction process, adjacent existing buildings should be monitored with strengthened vigor.
SUN Qingtian1 WANG Xinyu2 YANG Zhuangzhi1
.Excavation Technology of Shield Tunnels with Ultra-small Spacing in Complex Environment[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(1): 200-206
2022, Vol. 59 