类矩形盾构隧道装配式衬砌结构设计参数研究

Study on Design Parameters of Assembled Lining Structure of Quasi-rectangular Shield Tunnel

以曲墙曲拱的类矩形断面形式设计两车道拼装式盾构隧道衬砌,考虑地层抗力系数、覆土厚度、设计荷载等因素的影响,建立类矩形盾构隧道衬砌的梁-弹簧模型。结合昆明地区典型地质剖面,分别对均质环模型和梁-弹簧模型进行内力计算,验证计算模型的合理性。研究结果表明:随着地层抗力系数的增加,衬砌结构弯矩及剪力逐渐减小,轴力逐渐增大,改善了管片结构的受力状态。

The lining structure of two-lane tunnel is designed based on the cross section of quasirectangular with curved wall and arch.Considering the strata resistance coefficient,soil thickness,design loads and other factors,the beam spring model for quasi-rectangular shield tunnel lining is established.Based on the typical geological section of Kunming,the internal force calculation was carried out by homogeneous ring model and beam spring model to verify the rationality of the calculation model.The results showed that with the increase of the ground resistance coefficient of lining structure,the bending moment and shear force decreases and axial force increases gradually,which improved the stress state of the segment structure.