Abstract
The landslide at the entrance of a railway tunnel is large scale, and serious diseases are prone to appear under natural disasters, which threaten the safety of the tunnel. According to its characteristics, on-site long-term monitoring experiments and numerical analysis were carried out, and the mechanism of interaction between landslide and tunnel engineering was analyzed. The results show that under the impact of rainfall and earthquake, the original internal stress balance in the landslide body is disturbed, leading to the increase in landslide thrust and damage of the tunnel lining. Simultaneously, the excavation of the tunnel can slack the surrounding rock to increase the landslide thrust and make the landslide be finally formed; this landslide conversely acts on the tunnel, resulting in deformation and destruction of the tunnel. During the monitoring, under the influence of rainfall and earthquake, the stress of the secondary lining was continuously increased by 25%. Tunnel construction caused a maximum deformation of 30 mm in the antislide pile at a distance of 2.12 m, and the slope and the tunnel were also affected. Under extreme conditions such as rainfall and earthquake, shear failure occurred at the vault, bottom, and waist of the right-line tunnel located at the junction of soil and rock; at this time, the tensile strength of the tunnel reached 93.8% of the limit value of concrete, which seriously affected the safety of the tunnel. As for the weakened tunnel structure, measures such as dense planting and strengthening of concrete strength should be adopted to enhance the safety of the tunnel structure.
Highlights
As the Chinese railway is gradually constructed in the mountainous area, linear projects such as tunnels will inevitably pass through poorly cut geological bodies. e weak engineering geological body often exists at the entrance and exit of the tunnel, where tunnel excavation can induce geological disasters such as landslides and collapses
The main methods for studying this interaction include theoretical analysis, model test, and numerical analysis. eoretical analysis is mainly to analyze the law of deformation and force and their influencing factors in the landslide deformation zone by constructing mechanical models of rock-tunnel structure based on this relative position relationship [8–10]; the model test is mainly to verify the interaction mechanism through laboratory tests and large-scale model tests [11–16]; numerical analysis is mainly to calculate and analyze the interaction mechanism under the influence of different factors and working conditions such as rainfall earthquake tunnel construction based on Advances in Materials Science and Engineering numerical calculation software such as finite element discrete element finite difference [17–21]
(2) e excavation of the tunnel causes the surrounding rock to relax and deform, destroy the stress balance of the slope, and cause the slope to have a downward creep trend, which leads to the continuous increase in the landslide thrust, which eventually acts on the tunnel, resulting in deformation and damage of the tunnel
Summary
As the Chinese railway is gradually constructed in the mountainous area, linear projects such as tunnels will inevitably pass through poorly cut geological bodies. e weak engineering geological body often exists at the entrance and exit of the tunnel, where tunnel excavation can induce geological disasters such as landslides and collapses. The main methods for studying this interaction include theoretical analysis, model test, and numerical analysis. Eoretical analysis is mainly to analyze the law of deformation and force and their influencing factors in the landslide deformation zone by constructing mechanical models of rock-tunnel structure based on this relative position relationship [8–10]; the model test is mainly to verify the interaction mechanism through laboratory tests and large-scale model tests [11–16]; numerical analysis is mainly to calculate and analyze the interaction mechanism under the influence of different factors and working conditions such as rainfall earthquake tunnel construction based on Advances in Materials Science and Engineering numerical calculation software such as finite element discrete element finite difference [17–21]. In this paper, based on a railway, the mechanism of landslide-tunnel interaction is studied using long-term onsite monitoring and numerical calculation
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