A large-scale solution cavity treatment method for karst tunnels

Abstract

The invention discloses a karst tunnel large-scale cavern processing method. A cavern traversing tunnel section penetrating through a cavern comprises a tunnel section I, a tunnel section II and a tunnel section III according to the distribution positions, wherein two sides of the tunnel section I are suspended in midair and the top of the tunnel section I is at a smaller distance away from a cavern top plate, one side of the tunnel section II is suspended in midair, and two sides of the tunnel section III are suspended in midair and the top of the tunnel section III is at a larger distance away from the cavern top plate. The processing method comprises the steps of: 1, excavating a bypass pilot tunnel; 2, protecting inside of the cavern; 3, processing the bottom of the tunnel: filling the cavern below the tunnel section I with rock residues and grouting for reinforcing, and then distributing an armoured concrete slab girder, filling the cavern below the tunnel section III with concrete and then distributing an armoured concrete slab girder, filling the cavern below the tunnel section II with hard fillers; 4, constructing a gravity retaining wall at the suspending side of the tunnel section II; 5, constructing the tunnel section I with an open cut tunnel process; 6, constructing the tunnel section III with the open cut tunnel process after the bypass pilot tunnel bypasses; and 7, constructing the tunnel section II. The karst tunnel large-scale cavern processing method has the advantages of reasonable design, convenience for construction, safe and reliable construction process and short construction period, good processing effect on the large-scale cavern.

Description

technical field [0001] The invention relates to a method for treating dissolved cavities, in particular to a method for treating large-scale dissolved cavities of karst tunnels. Background technique [0002] The problem of karst is a major problem in tunnel engineering. The impact of karst on tunnel engineering is mainly manifested in deformation and instability around the tunnel, which often leads to local collapse, falling blocks and rockfall during tunnel excavation; It not only affects the construction safety, but also directly endangers the safety of personnel and mechanical equipment. The tunnels built in the west and southwest of my country often encounter karst problems. Karst areas are generally characterized by undulating topography, and water basins are easy to form in low-lying places. The long-term dissolution and erosion of surface water forms karst depressions or valleys of various shapes. The repeated circulation of surface water and groundwater forms karst p...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a large-scale solution cavity treatment method for karst tunnels in view of the deficiencies in the above-mentioned prior art, which has reasonable design, simple construction, safe and reliable construction process, short construction period, good treatment effect, and can Solve practical problems in the existing large-scale dissolution cavity treatment process, such as relatively large construction safety and operation safety risks, difficult construction of solution cavity treatment, long treatment time, and poor treatment effect

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