A Supporting Method for Extruded Expansive Rock Highway Tunnel

Abstract

The invention discloses a method for supporting swelling rock road tunnel, which comprises the following steps: a, excavating an upper step, erecting a first I-beam bracket of the upper step, carrying out bolt-spray support construction, and mounting a feet-lock bolt; b, erecting a second I-beam bracket of the upper step, and spraying a foamed concrete buffer layer of the upper step till the foamed concrete buffer layer is of a designed thickness; c, excavating a lower step, erecting a first I-beam bracket of the lower step, beating a resin anchor rod of the lower step, spraying concrete, beating the resin anchor rod of the lower step and inverting the feet-lock bolt or an anchor cable; d, pouring plastic concrete in an inverted manner; e, conducting secondary lining construction on the lower step, pouring and forming in one step, and adopting a vibration rod for layered tamping during the pouring process; f, refilling concrete in an inverted manner, and dismantling modules; and g, conducting secondary lining construction on the upper step, confirming the erection position of a mold plate through measuring and lofting, moving a trolley to an assigned position, cleaning the mold plate, and dismantling a plug mould. The method is simple, convenient, feasible, simple to operate, obvious in effect, and low in cost.

Description

technical field [0001] The invention relates to the technical field of highway tunnel construction, and more particularly relates to a support method for extruding expansive rock highway tunnels. Background technique [0002] The terrain and geological conditions in western China are complex. In recent years, long highway tunnels passing through areas of high ground stress and with harsh engineering geological environments have emerged, which has brought major challenges to the design and construction of expressway tunnels. [0003] The biggest problem in highway tunnel engineering with expansive surrounding rock is the structural design, construction and stability of the tunnel during operation. The prominent features of these tunnels are due to the expansion of the surrounding rock, poor lithology, large deformation and long duration. At present, conventional support measures are difficult to meet the large deformation requirements of expansive rock tunnels. During the co...

AI Technical Summary

Problems solved by technology

At present, conventional support measures are difficult to meet the large deformation requirements of expansive rock tunnels. During the construction process, cracking and damage of the primary lining and secondary lining often occur, and the deformation of the tunnel exceeds the limit, requiring continuous renovation.

Seriously affect the construction progress, increase the construction cost, and bring more safety hazards to the construction

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