北京地铁8号线鼓—中区间盾构长距离穿越古建民房群沉降控制技术

Settlement Control Technologies for Long-distance Shield Boring Underneath Old Residual Building Groups:Case Study on Guloudajie Station-China Art Gallery Station Section of Line 8 of Beijing Metro

为解决北京地铁8号线鼓楼大街站—中国美术馆站区间盾构长距离穿越古建民房群沉降控制及沉降监测难题,通过工程类比及理论计算,确定区间中心线两侧15 m为强烈影响区,并对该范围内房屋进行分段、分类监测。针对区间下穿、旁穿及叠落下穿民房群的不同穿越形式,采取洞内径向注浆、地表袖阀管注浆及洞内注浆结合地表袖阀管注浆等加固措施,在富水卵石层中通过进行渣土改良及同步注浆结合洞内径向注浆方式,有效地控制了地表建筑群的沉降,确保了穿越工程的顺利实施。

The running tunnel from Guloudajie Satation to China Art Gallery Station on Line 8 of Beijing Metro crosses underneath old residual building groups for long distance. There is great difficulty in the monitoring and control of the settlement induced by tunneling. The zone within the scope of 15 m on both sides of the center line of the running tunnel is determined, by means of engineering analogy and theoretical calculation, as the zone heavily influenced by tunneling. The buildings located in the mentioned zone are monitored on basis of their positions and types. Technologies, including insidetunnel radial grouting, ground surface Soletanche grouting and insidetunnel grouting assisted by ground surface Soletanche grouting, are adopted to cope with different conditions. Furthermore, ground conditioning and simultaneous grouting assisted by insidetunnel radial grouting are made in waterrich cobble strata. In the end, the ground surface settlement is brought under effective control and safe and successful shield boring is guaranteed.