Construction Method of Loess Tunnel Through Landslide

Abstract

The invention discloses a construction method for a loess tunnel passing through a landslide body. The tunnel entrance section and the tunnel exit section are constructed at the same time; while the tunnel entrance section and the tunnel exit section are being constructed, the inclined The entrance section of auxiliary construction of well and the exit section of auxiliary construction of inclined shaft shall be constructed. The invention is reasonable in design, simple in construction and good in use effect. Before excavation, cement-soil mixing piles are used to reinforce the loess layer in the construction area where the entrance section of the tunnel is located, and effectively limit the length and depth of reinforcement. The loose soil in the tunnel body is consolidated to ensure the safety and reliability of the construction process at the entrance section of the tunnel passing through the landslide. The construction process of the loess tunnel can be quickly completed, and the stability of the excavated tunnel hole can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, in particular to a construction method for loess tunnels passing through landslide bodies. Background technique [0002] Loess refers to sediments of yellow silt transported by wind during the Quaternary period in the geological era. Loess collapsibility coefficient (also called collapsibility coefficient) is a mechanical parameter to evaluate the collapsibility of loess. Under a certain pressure, loess collapsibility coefficient refers to the ratio of the difference between the height of the soil sample before and after soaking in water and the original height of the soil sample. The collapsibility coefficient of loess is an important index to evaluate the collapsibility of loess, which can be directly measured by experiment. According to the different collapsibility coefficient of loess, loess can be divided into collapsible loess and non-collapsible loess. Among them, non-collaps...

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Problems solved by technology

[0006] The construction of the entrance section of the loess tunnel passing through the landslide is very difficult, especially when the entrance section of the tunnel is located in the front of the landslide, the construction difficulty is even greater. After analysis, the main problems are as follows: Inducing the sliding of the landslide body can easily bring safety hazards and interference to the tunnel construction; second, the tunnel entrance (ie, the tunnel entrance) is located at the front edge (ie, the front) of the landslide body, and the infiltration of surface water makes the water content of the new loess higher , the slope of the tunnel entrance and the excavation of the open tunnel cannot guarantee its stability, and landslides are extremely prone to occur; third, when the tunnel dark tunnel passes through the landslide body, it is easy to cause disturbance to the landslide body during the excavation operation, so that the tunnel body is in contact with the landslide Under the interaction of different bodies, dislocation will be generated, which will lead to the destruction of the tunnel structure; fourthly, after the excavation of the tunnel body, the water on both sides of the tunnel body will flow to the tunnel body for discharge. shift

In addition, due to the special mechanical properties and structural characteristics of loess, the poor stability and low bearing capacity of surrounding rock have become the main problems faced by loess tunnel construction

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