Dam termite filling and permeating combined type grouting treatment method

Abstract

The invention discloses a dam termite filling and permeating combined type grouting treatment method. The method includes the steps of recognizing a termite nest group system, locating a main nest, and conducting first-order filling grouting and second-order permeating grouting. Slurry for the first-order filling grouting is a cement-bentonite mixture, and a portable grouting device is used for dry-method pore forming; slurry for the second-order permeating grouting is polyurethane-medicine mixed liquid, a grouting pouring pipe and a permeating grouting gun are adopted for the plum-blossom-shaped point distributing. By means of the filling and permeating combined type grouting technology, the grouting technology is created, the termite nest system is filled, the nest system and the surrounding combination part of the nest system are compacted, the structural integrity of a dam is improved, the leakage accident risk is reduced, termite is killed, and the reoccurrence of termite is prevented.

Description

technical field [0001] The invention relates to the technical field of maintenance and repair of earth-rock dams, in particular to a filling and infiltration combined grouting control method for termites in dams. Background technique [0002] There are 290,000 km of dikes and 98,000 reservoirs and dams in my country. Among them, most of them are homogeneous structures. Soil-dwelling termites damage homogeneous dams is an important safety hazard that has plagued water conservancy projects for a long time. More than 90% of the dikes and dams in the south of the Yellow River that have been in service for more than 15 years are damaged by soil-dwelling termites. After termites enter the interior of the embankment, they nest above the infiltration line of the normal water level and at a distance of 1 to 3 m from the top of the embankment. The diameter of the main nest can reach more than 1 m; ~7cm; numerous branches extending in all directions, forming a nest system. The nest...

AI Technical Summary

Problems solved by technology

[0004] 1. The nest group system still exists after the booby-trapping law treatment, and the safety hazards of the structure itself have not been eliminated

[0005] 2. Considering the complexity of the nest group system, the nest digging method is a large project, and the treatment effect is related to the thoroughness of the nest group

However, due to the limitation of viscosity, it is difficult for the slurry to completely fill the main nest and ant tunnel, and the filling space accounts for about 85% of the volume of the nest system, leaving gaps between the nest system and the surrounding soil.

[0009] 3) Due to factors such as strengthening the anti-seepage wall isolation, grouting slurry blockage and other factors will cause the existence of isolated nests, and the nest system of young nests is not developed enough, it is also easy to cause defects and hidden dangers left by grouting

[0010] Under the above circumstances, if re-irrigation is adopted, the effect will not be good.

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