The drainage tunnel needs to withstand both external soil and water pressure and internal water pressure.Compared to ordinary shield tunnels,the axial pressure level of the lining structure is reduced and there is a risk of cracking.Usually,a secondary lining is applied inside the original tunnel segment to form a double-layer lining structure.Based on an existing large-diameter tunnel into a regulating and storage tunnel,Numerical simulation methods were used to analyze the effects of interface bonding methods,secondary lining materials,and secondary lining thickness on the stress characteristics and safety of the double-layer lining struc-ture.The force transmission mechanisms of different forms of double-layer lining structures were clarified,and suggestions were provided for structural selection and secondary lining design.
NETL
NSTL
万方数据
