A Construction Method of Segmented Grouting for Water Leakage in Karst Tunnel

Abstract

The invention provides a sectional grouting construction method for karst tunnel water leakage. Construction is conducted according to the principle of obvious stream-shaped water leakage point drainage and apron grouting control, and construction is conducted on a karst tunnel sequentially from bottom to top in the radial direction. The construction method comprises the following steps that (1) one or two water drainage holes are formed with an obvious stream-shaped water leakage point serving as the center according to actual conditions, the hole diameter is not smaller than 70 mm, and hole packers are mounted in the water drainage holes and reinforced to collect water; (2) in terms of regional apron control, grouting drilled holes adopt a quincuncial shallow-deep hole combined layout mode; (3) grouting holes are flushed; (4) grouting pipes are inserted into the grouting holes; (5) hole opening waterproof plugs are arranged in the openings of the grouting holes; (6) sectional grouted grout is compacted in a controlled mode; and (7) the hole openings are blocked off through plain concrete after grouting is completed. According to the sectional grouting construction method, the grouting holes are subjected to grouting sectionally, the process of repeated drilling, grouting and hole bottom cleaning is avoided, drilling and grouting can be operated simultaneously, the construction efficiency is greatly improved, and the sectional grouting construction method is suitable for emergency construction.

Description

technical field [0001] The invention relates to a tunnel water leakage grouting reinforcement method, in particular to a karst tunnel water leakage segmental grouting construction method, which belongs to the technical field of underground and tunnel engineering. Background technique [0002] At present, with the continuous development of underground and tunnel technology, some large tunnels need to be built in remote areas, and some even need to be built in karst development areas. Construction of tunnels in karst-developed areas often causes excessive deformation or even collapse of surrounding rock due to water leakage in karst tunnels, which poses a great threat to the safety of technicians and equipment. In order to reduce the impact of water leakage in karst tunnels on construction safety, grouting reinforcement for karst and water leakage is widely used at home and abroad. [0003] The traditional grouting reinforcement technology generally uses different depths of g...

AI Technical Summary

Problems solved by technology

[0004] (1) Large amount of engineering: multiple grouting holes need to be constructed at different depths at the same section position;

[0005] (2) Low grouting efficiency and long construction period: repeated drilling, grouting and sweeping are required;

[0006] (3) The sealing effect of the grouting hole is poor: the upper grout cannot reach sufficient strength and then the lower grout is injected;

[0007] (4) The effect of grouting reinforcement is not ideal: synchronous grouting cannot be realized, drainage cannot be achieved in adjacent grouting holes, the effect of compaction cannot be guaranteed, and the anti-seepage ability cannot be improved

Images