Abstract
In order to study the antibreaking effect of the fiber reinforced concrete lining in the tunnel, this paper takes the a subway tunnel engineering project in F2-3 section of Jiujiawan fault as the research background and carries out the antibreaking model test of the fiber reinforced concrete lining in the active fault zone of high earthquake intensity. The results show that the antibreaking effect of the principle stress and the longitudinal strain of the fiber reinforced concrete lining are 30%∼40% and 80%∼90%, respectively, and the minimum value of the structural safety factor is increased by 4∼5 times. The antibreaking effect of hybrid fiber reinforced concrete lining is better than that of steel fiber reinforced concrete lining. The safety of steel polypropylene hybrid fiber reinforced concrete tunnel lining is the highest, and its minimum structural safety factor is 1.62. In the aspect of improving the antibreaking effect of the tunnel, the toughening effect of fiber reinforced concrete is stronger than that of reinforcing. The research results are of great significance to improve the antibreaking effect of tunnels in active fault areas with high earthquake intensity.
Highlights
In recent years, the development trend of tunnel engineering is rapid
The transportation infrastructure construction in western China continues to develop in depth, and traffic tunnels in active fault zones with high earthquake intensity continue to emerge, such as the Erlangshan Tunnel of Yakang Expressway, Lanjiayan Tunnel of Mianyang-Maoxian Highway, series of tunnels of Lhasa-Shigatse Railway, and series of tunnels of Sichuan-Tibet railway
In this paper, based on a subway tunnel engineering in F2-3 section of Jiujiawan fault, the model test research on the antibreaking performance of the fiber reinforced concrete lining in active fault zone with high earthquake intensity is carried out, which is of great significance to improve the safety and stability of the traffic tunnel structure in the mountainous area with high earthquake intensity
Summary
The development trend of tunnel engineering is rapid. More and more tunnel projects, even under extreme conditions, have been put into use and operation. E main research contents include the following parts Experts such as Xiong et al used numerical simulation and model tests to study the mechanical response and damage mechanism of stick-slip dislocation of the fault [4, 5]. Liu et al and other experts used the model test to study the antibreaking effect of the measures of reducing dislocation joints, reducing dislocation layers, and thickening the secondary lining [8,9,10]. In this paper, based on a subway tunnel engineering in F2-3 section of Jiujiawan fault, the model test research on the antibreaking performance of the fiber reinforced concrete lining in active fault zone with high earthquake intensity is carried out, which is of great significance to improve the safety and stability of the traffic tunnel structure in the mountainous area with high earthquake intensity
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