Through landslide body loess tunnel construction method

Abstract

The invention discloses a through landslide body loess tunnel construction method. The through landslide body loess tunnel construction method comprises the following steps of constructing a tunnel entrance section and a tunnel exit section simultaneously; and respectively constructing an inclined shaft auxiliary construction inlet section and an inclined shaft auxiliary construction outlet section through a tunnel inclined shaft when the tunnel entrance section and the tunnel exit section are constructed. The through landslide body loess tunnel construction method is reasonable in design, convenient to construct and good in using effect; the loess strata in the construction area where the tunnel entrance section is positioned is subjected to reinforcement treatment by using a cement soilmixing pile in advance before excavation, and the reinforcement length and the reinforcement depth are effectively limited; a loose soil body on a hole body of a tunnel hole is solidified in advance so as to ensure the safety and reliability of the construction process of a hole inlet section of the through landslide body loess tunnel; meanwhile, in the construction process of the tunnel by adopting a three-step excavation method, the construction process of track plates is completed synchronously, so that the construction process of the loess tunnel can be completed easily, conveniently and quickly; and the stability of an excavated and formed 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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