Large-scale karst cavity treatment method for karst tunnel

Abstract

The invention discloses a large-scale karst cavity treatment method for a karst tunnel. In the construction tunnel, the section traversing the interior of a large-scale karst cavity is a traversing karst cavity section, the left and right sides of which are suspended; and the size of the large-scale karst cavity is gradually increased from top to bottom, and the karst cavity is divided into an upper karst cavity and a lower karst cavity by the traversing karst cavity section. The treatment method comprises the following steps of: 1, digging a side slope, and performing reinforcing construction, namely digging the inner wall of the upper karst cavity to form the side slope; 2, backfilling rock slag, namely filling the lower karst cavity by adopting the rock slag to form a filling base layer; 3, grouting and reinforcing the filling base layer, namely reinforcing the filling base layer by using a stabilizing pile and obtaining a road cutting I; and 4, performing paving construction of the traversing karst cavity section on the road cutting I. The method is reasonable in design, simple and convenient in construction, safe and reliable in the construction process, short in construction period and good in treatment effect, and can solve the problems of high construction safety risk, high treatment and construction difficulty, long treatment time, poor treatment effect and the like in the conventional large-scale karst cavity treatment.

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, which has reasonable design, simple construction, safe and reliable construction process, short construction period, and good treatment effect. Effectively solve the practical problems existing in the existing large-scale dissolution cavity treatment process, such as greater construction safety and operation safety risks, difficulty in solution cavity treatment construction, long treatment time, and poor treatment effect

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