Partly bright partly dark holed construction method for highway tunnel

Abstract

The invention discloses a partly bright partly dark holed construction method for a highway tunnel. The method comprises the following steps: a, building a catchwater system on the roof of the tunnel;b, excavating and supporting a side slope of a tunnel opening; c, building an unsymmetrical retaining wall on the outer side of the tunnel opening; d, supporting an open cut tunnel on the outer sideand constructing a protecting arch; and e, excavating and supporting a dark tunnel on the inner side and filling the dark tunnel with an inverted arch. By building a catchwater on the roof o the tunnel, rainwater can be prevented from scouring a slope surface for a long time; the side slope on the tunnel opening is excavated and supported to enhance the stability of the side slope of the tunnel opening, and by building the unsymmetrical retaining wall on the outer side, influence of unsymmetry to the structure is reduced. The open cut tunnel on the outer side is supported and the protecting arch is constructed, and finally, the dark tunnel on the inner side is excavated and supported, and the dark tunnel is filled with the inverted arch. The method can balance loads of rocks around the tunnel effectively to make sure that a holed construction environment of the tunnel is stable, so that the problem of difficulty in tunnel holed construction is solved effectively.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a half-light and half-dark entry construction method for a highway tunnel. Background technique [0002] With the speeding up of expressway construction, the design requirements for lines are also increasing. Since most lines will inevitably pass through mountainous areas, it is necessary to build tunnels to cross the mountain. Affected by the mountain, the entrance of the mountain road tunnel is prone to oblique intersection of the tunnel entrance axis and the topographic line of the mountain. Unavoidable bias and shallow burial at the entrance section, and the rock mass at the entrance section is generally broken and poor in stability. When there is a construction Under the influence of disturbance and rainwater environment, the rock mass in the front section of the tunnel is prone to great changes in physical and mechanical aspects, which will lead to difficulties in tunnel ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a road tunnel for the problems that when the entrance axis of the road tunnel intersects obliquely with the topographic line of the mountain, there is bias and shallow burial at the entrance section, and the stability of the surrounding rock at the entrance section is poor, which may easily cause difficulties in the construction of the tunnel. The half-light and semi-dark tunnel entry construction method can ensure the stability of the tunnel entry construction environment, effectively solve the problem of difficult tunnel entry construction, and also provide a basic entry safety guarantee for subsequent tunnel construction

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