Abstract Many active faults, especially strike-slip faults, exist along the Sichuan-Tibet Railway, and it is easy for strike-slip fault dislocations to make a tunnel that passes through an active fault zone suffer serious structure damages. Taking a railway tunnel that passes a fault zone as the engineering background, this paper adopts the finite-difference numerical simulation to evaluate the safety of the tunnel structure by analyzing the displacement, stress and strain of the tunnel structure under different strike-slip fault dislocations. The research shows that: with strike-slip fault dislocation, the larger the dislocation is, the greater the displacement of the tunnel structure will be except longitudinal displacement, and the greatest impact the strike-slip fault dislocation will have on the tunnel structure in the fault area and the hanging wall area; after the strike-slip fault dislocation is larger than 0.6 m, the stress on the tunnel structure is less affected by the dislocation; After the strike-slip fault dislocation is greater than 0.6 m, the tunnel structure starts to be damaged, and the damage rage increases with the increase of the dislocation.
Abstract：
Many active faults, especially strike-slip faults, exist along the Sichuan-Tibet Railway, and it is easy for strike-slip fault dislocations to make a tunnel that passes through an active fault zone suffer serious structure damages. Taking a railway tunnel that passes a fault zone as the engineering background, this paper adopts the finite-difference numerical simulation to evaluate the safety of the tunnel structure by analyzing the displacement, stress and strain of the tunnel structure under different strike-slip fault dislocations. The research shows that: with strike-slip fault dislocation, the larger the dislocation is, the greater the displacement of the tunnel structure will be except longitudinal displacement, and the greatest impact the strike-slip fault dislocation will have on the tunnel structure in the fault area and the hanging wall area; after the strike-slip fault dislocation is larger than 0.6 m, the stress on the tunnel structure is less affected by the dislocation; After the strike-slip fault dislocation is greater than 0.6 m, the tunnel structure starts to be damaged, and the damage rage increases with the increase of the dislocation.
TANG Langzhou1,
2 YU Li1,
2 WANG Yusuo1 etc
.Numerical Analysis on the Effect of Strike-slip Fault Dislocation on the Structural Safety of Railway Tunnels[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(1): 214-224
2022, Vol. 59 