A method for controlling the collapse of the fractured zone in the process of tunnel construction

Abstract

The invention discloses a treatment method for fault fracture zone collapse in the tunnel construction process. The method includes the steps that firstly, arch reinforcement is conducted on every two adjacent surrounding rocks in a collapse segment; secondly, a collapse body is removed, and concrete is jetted to the collapse tunnel face after the collapse body is removed to close the collapse segment; thirdly, a lifting jack acts on the four corners of each bottom of racks of formworks, the interval identical to the width of a steel arch is reserved between the formworks, formwork erection is conducted in time, and the formworks and the steel arch jointly form a supporting layer; fourthly, through holes reserved in the formworks in advance, an arch apex concrete layer is formed in a high-pressure grouting mode, and small grouting guide pipes are punched into arch springs and the side walls of the steel arch; fifthly, the front end of a bottom die composed of the formworks and the steel arch is grouted and reinforced through the small guide pipes, operation of the next construction circulation stage of the collapse segment is conducted, and the first step, the second step, the third step and the fourth step are specifically repeated; sixthly, after second circulation is finished, supports of arch protecting layer concrete are formed through conveying ports embedded through the second step.

Description

technical field [0001] The invention relates to a method for treating the collapse of a fractured fault zone during tunnel construction. Background technique [0002] Landslide disasters frequently occur during tunnel construction. When the tunnel construction reaches the fault fracture zone, due to the sudden drop in the surrounding rock grade and the fact that the fault fracture zone is often rich in groundwater, the original initial support design is difficult to maintain the stability of the surrounding rock, and a large-scale landslide occurs. Tunnel landslides will cause delays in the construction period, damage to machinery and equipment, increase in investment costs, and pose a huge threat to the safety of construction personnel on site. [0003] At present, the main technical means to control landslides are the advanced small conduit method and the advanced support method of pipe shed. Because the landslides in the fault fracture zone have the characteristics of l...

AI Technical Summary

Problems solved by technology

After the small conduit is grouted to consolidate the landslide body, during the construction of the pipe shed advance support, drilling difficulties, hole collapse, drill sticking, surrounding rock settlement and deformation are often serious, and the pipe shed cannot be installed

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