Semi-analytical Solution of Relative Displacement of Soil Layer Caused by Construction of Adjacent Double-track Tunnel
The construction of adjacent double-line tunnels will have mutual influence,and the section convergence deformation of double-hole tunnels is quite different from that of single-hole tunnels.A new displacement boundary condition was proposed based on the characteristics of the deformation of the adjacent double-line tunnel.By introducing the displacement release coefficient 77,the displacement generated by the tunnel excavation and the lining construction was considered respectively.According to the theory of complex variable function and alternating method,the semi-analytical solution of the adjacent double-line shield tunnel after excavation was obtained.and the theoretical solution was verified by two field engineering monitoring data.Finally,the geometrical parameters of the tunnel were analysed to obtain the disturbance pattern of ground deformation under the influence of different factors in the construction of a two-lane tunnel.The results show that the lateral deformation of the tunnel has a large effect on the shape and size of the surface settlement curve,however,it has a small effect on the width of the surface settlement trough.Displacement release coefficients have a significant effect on surface settlement,which decreases as the displacement release coefficient increases and vice versa.The greater the depth of the tunnel,the smaller the surface settlement value and the larger the area of influence,and when it exceeds a certain depth,the change in the surface settlement value is relatively small.As d/R increases,the surface settlement curve shape evolves from V-U-W.
万方数据
维普
