南京地铁软流塑地层施工沉降分新与控制

南京地铁2号线上海路一新街口站区间施工采用暗挖法施工，该地区为软流塑淤泥质地层，为防止地表过大沉降，必须对其进行地层加固。在施工中采用水泥一水玻璃双液浆全断面劈裂注浆的工艺进行地基预加固，并采用超前小导管和喷锚支护等施工方法，有效地控制了施工中的地表沉降，确保了开挖过程中隧道本身和地表建筑物和管线的安全。

Analysis and Control of Construction Settlement of Soft Flow Plastic Layers of Nanjing Metro

Tunneling method is used for construction of the section between Shanghai Road - Xinjiekou station on Nanjing Metro Line 2. With soft flow plastic muddy layer, ground reinforcement must be used to prevent surface excessive settlement. The foundation pre-reinforcementis used in the construction by double liquid slurry technology with cement - fiber glass in fracturing grouting to the full section. Meanwhile probe piping and spray anchor support construction methods are also used to effectively control surface subsidence in the construction in order to ensure the excavation of the tunnel and the safety of the surface buildings and pipeline.