厦门轨道交通1号线某区间盾构隧道施工引起的地表变形特征研究

Analysis of Surface Settlement Characteristics Induced by Shield Tunneling in A Section on Xiamen Rail Transit Line 1

依托厦门轨道交通吕厝站—城市广场站区间盾构隧道工程,针对典型风化花岗岩地层盾构施工引起地表变形的问题,采用现场监测数据统计分析结合数值模拟的方法,开展地表横向、纵向变形规律的研究。结果表明:厦门典型风化花岗岩地层盾构隧道施工的主要横向影响范围大致为轴线两侧20 m内,沉降槽宽度参数约为0.55;纵向影响范围大致分布在刀盘前方5~10 m至盾尾后方20~30 m的范围内;此外,典型风化花岗岩地层盾构施工引起的地表沉降均值约为-15.0 mm,地层损失率约为1.0%。

Based on the shield tunnel project between Lvcuo Station and City Square Station in Xiamen urban rail transit,the surface deformation caused by shield tunneling in typical weathered granite strata is studied by using the field monitoring data analysis and the numerical simulation method,the transverse and longitudinal deformation laws of the surface are analyzed.The results show that the main lateral influence range of shield tunneling in Xiamen metro is approximately 20 m on both sides of the two tunnel axis,and the width parameter of the settlement trough is around 0.55 m.The influence range of longitudinal surface deformation is approximately 5~10 m in front of the shield cutter,and 20~30 m behind the shield tail.In addition,the mean surface settlement caused by shield tunneling in typical weathered granite strata is about-15.0 mm,and the formation loss rate is about 1.0%.