Abstract
In order to study the interaction between the left and right tunnels of suspension bridge tunnel-type anchorage, the finite difference numerical software is used to analyze the mechanical properties of the surrounding rock during the construction process. A numerical analysis model based on FLAC3D is established to analyze the stress, displacement and plastic zone changes of the surrounding rock of right tunnel anchor cavern during the construction of left tunnel anchor cavern. The right tunnel anchor cavern is excavated firstly, and then the left tunnel anchor cavern is excavated. The numerical simulation results show that the main displacement of the right tunnel occurs in the construction stage of the anchor plug body and the rear anchor cavern of the left tunnel. During the excavation of the left tunnel, the plastic zones of the left and right tunnel anchor caverns are only connected above the middle of the waist wall. Therefore, it is suggested that during the construction process, especially in the excavation stage of the anchor plug body and the rear anchor cavern, the area above the middle of the tunnel waist wall should be strengthened in time to ensure the construction safety.
Highlights
Tunnel anchor is a kind of anchorage in suspension bridge
Because tunnel anchors have high requirements for the integrity and strength of surrounding rocks, there are few cases of tunnel anchors used in the existing suspension bridges all over the world
In the 20th century, tunnel anchors were used in only 7 out of 39 suspension bridges built in the world, accounting for 17.9% of the total.(Zhu, Y. et al, 2005) At present, the research on tunnel anchors mainly adopts model tests and numerical simulations, including the ultimate bearing
Summary
Tunnel anchor is a kind of anchorage in suspension bridge. Compared with gravity anchor, tunnel anchor can significantly reduce the cost and has less influence on the surrounding environment. (Lu, Y.C., 2003) Tunnel anchors combine the surrounding rock and the anchorage to bear the force as a whole, which is more reasonable in the structure and is widely used in areas with small joints and good mechanical properties of rock mass. Because tunnel anchors have high requirements for the integrity and strength of surrounding rocks, there are few cases of tunnel anchors used in the existing suspension bridges all over the world. In the 20th century, tunnel anchors were used in only 7 out of 39 suspension bridges built in the world, accounting for 17.9% of the total.(Zhu, Y. et al, 2005) At present, the research on tunnel anchors mainly adopts model tests and numerical simulations, including the ultimate bearing. This paper aims to investigate the mechanical characteristics of surrounding rock of the right tunnel anchor cavern during the excavation of left tunnel anchor cavern. Based on a large-span suspension bridge tunnel anchor project in southwest China, a numerical calculation model is established to study the surrounding rock stress distribution, deformation characteristics and plastic zone of surrounding rock during excavation. The main stressbearing parts (middle and lower parts) of the anchor plug body is in the relatively complete III surrounding rock in the unloading zone
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