Research on the Disturbance Influence Law and Safety Distance of the Cable Tunnel Induced by the Construction of the Underground Subway Tunnel
In this paper,the influence of subway tunnel construction on the deformation and stress disturbance of cable tunnel with different section sizes is studied by means of numerical simulation for two common working conditions of underground tunnel with vertical and 45° down slope.On this basis,the relationship curve between the distance between two tunnels and the minimum safety factor of the secondary lining structure of the cable tunnel is obtained by checking the ring and longitudinal safety factor of the cable tunnel,and the corresponding safety protection distance is determined according to the control index of the secondary lining safety factor.The results show that the settlement and tensile stress of the cable tunnel structure caused by vertical underpass are higher than those under inclined underpass condition.The distance between the tunnel and the minimum safety factor of the secondary lining of the cable tunnel are linearly increased under both conditions.Under the same calculation conditions,the safety distance of vertical underpass is greater than that of parallel underpass 45°.
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