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Analysis of the Effect of Anchoring Durability on Tunnel

Author: JuSong
Tutor: ChenQiHui
School: Shandong Institute of Architecture
Course: Bridge and Tunnel Engineering
Keywords: Anchorage Durability Tunnel structure Numerical simulation
CLC: U455.4
Type: Master's thesis
Year: 2011
Downloads: 34
Quote: 0
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Abstract


With the popularity of new Austrian method around the world, the quantity of the anchoring structure in our country is a huge amount. Since 1980, the railway tunnels according to the principle of NATM tunnel construction took 10% of the total number and total length. There has been instances of the failure of anchorage durability.In the past, the anchorage design was based on the overall stability, took the static design. Under the precondition of Equilibrium conditions, the anchoring system was considered to be permanent, the concept of progressive failure was not considered. But as a structure in a high stress state, buried in the ground mostly, and affected by construction environment, corrosive media and other factors, the anchoring structure will inevitably appear durability problems. There will appear problems such as anchorage body corrosion, stress relaxation, gradually decay of anchorage strength and other issues. Many factors will significantly affect the life of anchoring system.The anchorage structures are used a huge amount, service in bad environment, have a higher durability require, and most are designed as the main support structure. In the event of durability, it will lead to very serious consequences, we must pay close attention. The research on the durability of anchoring structure not only have large economic value, but also related to people’s safety and national security.In this article numerical model was established through the section DK423+505 in the entrance of Daiyunshan tunnel to simulate the tunnel excavation and support the process and analysis the rock stress and supporting internal forces. Compared with the surrounding rock displacement by the actual measurement, the finite element model was proved to be correct and feasible.Based on the model, the surround rock strengthen effect and the anchoring support effect were considered to simulate influence of the anchoring structures durability on the tunnel rock and support by changing the rock parameter or the bolt strength and the friction coefficient. In addition, the Influencing of the the rock level and the depth of tunnel was simulated. The results show that:1, the reducing of the anchoring structure durability caused the stress decrease of rock around the tunnel, increase in supporting structure internal forces, and the decline in bolt axial force.2, the reducing of the anchoring structure durability caused the increase of horizontal convergence of the key points, the crown settlement and the bottom edge uplift. The vertical displacement was of the most obvious.3, the higher level surrounding rock can withstand higher loads. The quantity of rock stress and support internal forces was influenced by the depth of the tunnel, and tunnels of different rock levels and depth appears similar in the trend of rock stress and support internal forces.

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CLC: > Transportation > Road transport > Tunnel project > Tunnel construction > Construction methods
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