硬岩地层TBM掘进引起地表变形的计算分析

Calculation and Analysis of Surface Deformation Caused by TBM Tunneling in Hard Rock Strata

以重庆轨道交通环线凤鸣山站—上桥站区间隧道工程为依托,以现场监测数据为基础,采用数据拟合的方式比较经典Peck公式、Sagaseta公式及Loganathan公式在砂岩与砂质泥岩地层的城市地铁TBM隧道地表施工沉降计算中的精准性。研究表明经典Peck公式拟合的砂岩与砂质泥岩地层TBM施工地表沉降更为精准,最后采用ANSYS数值模拟进一步验证了Peck公式用于砂岩与砂质泥岩地层TBM双线隧道地表施工沉降计算的可靠性。

According to the tunnel construction of Chongqing rail link from Fengming Mountain Station to Shangqiao Station,based on in-site monitoring data,research adopts data fitting to compare the accuracy of classic Peck formula,Sagaseta formula,Loganathan formula in the TBM surface calculation of urban metro tunnel in sandstone and sandy mudstone stratum. Research turns out that the classical Peck formula is more accurate in fitting in surface subsidence of sandstone and sandy mudstone stratum,and finally adopts ANSYS numerical simulation to further testify the Peck formula＇s reliability in surface settlement calculation of TBM double track tunnel in sandstone and sandy mudstone stratum.