浅埋隧道复杂交叉口变形的数值分析

以重庆轨道交通六号线曹家湾站为工程依托,基于岩体非线性弹塑性理论,对浅埋隧道施工通道交叉段进行数值分析及力学特性研究。运用有限差分数值软件FLAC3D建立了浅埋隧道复杂交叉段的三维模型,研究了隧道交叉口3个不同截面的拱顶沉降和围岩收敛,以及初期支护钢筋的内力变化特征,并与现场监控量测数据变化情况进行对比分析。研究结果表明:主、支通道交叉区域段受力存在相互影响;3个截面的拱顶、内空位移均有明显变化;在交叉隧道拱顶、拱肩区域,初支钢筋受应力影响较大。

Numerical Analysis of Complex Intersections Deformation of Shallow Tunnel

Based on the rock nonlinear elastic-plastic theory and with the CaoJiawan station of Chongqin Rail Transit line 6 as an engineering case, makes numerical analysis and mechanical properties study on the channel cross section of shallow tunnel. Establishes a three-dimensional model of the complicated cross section of shallow tunnel by the finite element numerical software FLAC3D, studies the vault sedimentation and surrounding rock convergence of three different sections of the tunnel crossing as well as the variable characteristics of internal force of primary support steel, and compares with the data from field monitoring and measuring. The results show that the interrelationship exists in main channel cross section and secondary channel cross section; the vault and vacancy shift of three sections obviously changes; the initial branch bars are subjected to stress influences in the cross tunnel vault and arch area.