三洞并行盾构隧道开挖引起的地表沉降研究

Study on Ground Surface Settlement Caused by Excavation of Three-parallel Shield Tunnel

针对三洞隧道开挖引起的地表沉降规律,以南通轨道交通1号线孩-环区间盾构隧道工程为依托工程,采用现场数据监测、理论分析和数值模拟,研究了三洞并行盾构隧道施工对地表沉降规律的影响。研究结果表明:提出一种计算三洞并行隧道开挖地表沉降曲线的“三阶段分析法”,综合比较“三阶段分析法”得到的沉降预测曲线、现场沉降实测数据的拟合曲线及数值模拟的沉降计算曲线可知,提出的“三阶段分析法”和数值模拟方法均能较好地反映三洞并行盾构隧道的真实施工情况。

Focusing on the settlement law of the ground surface caused by the excavation of the three-parallel tunnel,and based on the shield tunnel engineering in Hai–Huan section of Nantong Rail Transit Line 1,this paper studied the influence of the construction of the three-parallel shield tunnel on the settlement law of the ground surface by field data monitoring,theoretical analysis,and numerical simulation.As a result,a"three-stage analysis"for calculating the surface settlement curve of excavation of the three-parallel tunnel was proposed.Comprehensively comparing the settlement prediction curve obtained from the"three-stage analysis",the fitting curve of field settlement data,and the settlement calculation curve from the numerical simulation,both the"three-stage analysis"and the numerical simulation can well reflect the real construction situation of the three-parallel shield tunnel.