In this paper, The construction disturbance effect of subway tunnel on the cable tunnel of various cross-sectional sizes under various spacing is studied using numerical simulation. The two common working conditions are orthogonally undercrossing and obliquely underpassing cable tunnels under subway undercover tunnel. The main conclusions are: (1) The settlement and tensile stress value of the existing cable tunnel generated by the orthogonally undercrossing is higher than that of the obliquely underpassing; (2) The larger the cross-sectional size of the existing cable tunnel, the higher its structural longitudinal stress and the lower the safety.
The construction of shield tunnel cause the disruption on the urban cable tunnels nearby, resulting in the emergence of structural diseases in cable tunnels. Numerical simulation is used to derive the mechanical response law on the cable tunnel during shield tunnel construction. Different affecting aspects are explored, such as geographical location relationship, cable tunnel section size, and spacing, and finally the safety of cable tunnel is analyzed.
This paper focuses on the construction influence of the foundation pit on the adjacent existing cable tunnel. And the retaining structure of the pit is soil nailing wall. Three-dimensional finite difference method is used to simulate the influence of the foundation pit excavation on the tunnel. And many influence factors are considered in analyzing disturbing deformation and safety of the tunnel, such as pit depth, spacing between pit and tunnel, and buried depth of the tunnel. The calculation results show that the horizontal displacement is the dominant deformation on the slope stability for the foundation pit with soil nailing wall. With the increase of the pit depth, the safety of tunnel structure is non-linearly weakened. While the spacing between pit and tunnel became large, the tunnel safety increases nonlinearly. But the safety of the tunnel increases firstly and then decreases with the increase of the tunnel buried depth. The research results can provide reference for the protection of the existing cable tunnels while adjacent foundation pit construction.
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