Tunnel supporting structure

Abstract

The invention relates to a tunnel supporting structure. The structure comprises an annular artificial blasting area formed by a complete rock mass around a collapse column at a certain height above ablasting tunnel, wherein the collapse column after blasting is in a nail shape, pipe shed pipes penetrating through the collapse column from a construction chamber and entering a front stable rock mass by a certain distance are further included, each pipe shed pipe comprises a grouting steel pipe and a common steel pipe, vertical grouting steel pipes are inserted into the above collapse column from annular gaps among the pipe shed pipes, the outer ends of the vertical grouting steel pipes are welded to the pipe shed pipes, meanwhile, the exposed ends of the plurality of adjacent vertical grouting steel pipes can intersect at one points to form intersection points correspondingly, every three intersection points are welded together to form triangular stable structures, steel arches are arranged in parallel along the axial direction of the tunnel, in addition, a drainage hole is constructed in the direction from the construction chamber to the collapse column, and the bottom end of the drainage hole is higher than a grouting reinforcement area. The stability of the tunnel collapse-column-passing supporting structure is higher than the stability of a structure in the prior art.

Description

Technical field [0001] The invention relates to the field of tunnel construction, in particular to a supporting structure for a tunnel passing through a karst column / sink column. Background technique [0002] Mountain tunnels are excavated in the mountains. During the excavation process, karst columns / collapsed columns and other unfavorable geological sections will be encountered. If the treatment measures are slightly improper, the gravel in the karst columns / collapsed columns will intrude into the tunnel, not only during tunnel construction. Brings various threats and also threatens the tunnel security during the operation period. The prior art mainly uses grouting to reinforce the gravel in the karst area / collapsed column to increase the strength of the tunnel support. There are problems such as weak grouting body and the technical problem that the karst column / collapsed column is easy to collapse again in the later stage. Summary of the invention [0003] In view of the above...

AI Technical Summary

Problems solved by technology

[0002] Mountain tunnels are excavated in the mountain body. During the excavation process, unfavorable geological areas such as karst pillars / collapsed pillars will be encountered. Slightly improper treatment measures will cause gravel in the karst pillars / collapsed pillars to break into the tunnel. Bring various threats, and also pose a threat to the tunnel security during the operation period

The existing technology mainly uses grouting to strengthen the gravel in the karst area / collapsed column and increase the support strength of the tunnel. There are problems such as the grouting body is not firm, and the technical problem that the karst column / collapsed column is easy to collapse again in the later stage

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