Non-closed borehole sealing process and structure

Abstract

The invention discloses a non-closed borehole sealing process and structure. All designed grouting hole tracks are mutually overlapped and surrounded in space, a sand-clock-type grouting-hole-series model which is of a structure with two thick ends and a thin middle can be formed, the part, with the thin middle, of the grouting-hole-series model corresponds to a sealing position top plate, the stratum of the sealing position top plate is an intensely weathered zone, the extension range of fractures is small, and therefore, the horizontal diffusion range of slurry is small; the part, with the thick lower end, of the grouting-hole-series model corresponds to a sealing position bottom plate, and is generally a weak weathering zone, unweathered protolith or a transitional zone between the weakweathering zone and unweathered protolith, the extension range of the fractures is large, and the horizontal diffusion range of the slurry is large. By means of the non-closed borehole sealing process and structure, slurry diffusion features in different stratas are fully utilized, the slurry diffusion superposition rate within a certain sealing range is increased, a cone-shaped waterproof curtain can be obtained based on the structures, and boreholes are effectively sealed.

Description

technical field [0001] The application belongs to the technical field of borehole plugging, and in particular relates to an unsealed borehole plugging process and structure. Background technique [0002] The Quaternary is the second period of the Cenozoic Era. The stratum formed in the Quaternary is called the Quaternary, and the Quaternary sediments are widely distributed. Except for the steep hillsides with exposed rocks, almost all parts of the world are covered by Quaternary sediments. The Quaternary sediments were formed relatively late, most of them were not cemented, and they were relatively well preserved. Quaternary deposits mainly include glacial deposits, fluvial deposits, lacustrine deposits, eolian deposits, cave deposits and marine deposits. Followed by ice-water deposits, residual deposits, slope deposits, flood deposits, biological deposits and volcanic deposits. Quaternary formations are highly permeable and water-rich, consisting of thick gravel pebbles,...

AI Technical Summary

Problems solved by technology

However, due to various reasons, some boreholes have not been sealed after the final hole, and are in an unsealed state. During mine infrastructure and mining, once these boreholes are exposed, they will form direct hydraulic pressure between the Quaternary water and the stope. channel, forming a major hidden danger of water inrush in the mine pit, which needs to be blocked and treated in advance

[0004] However, due to the long history, the Quaternary formation section of the borehole has collapsed, and the parameters of the borehole trajectory are incomplete, the position and orientation of the borehole opening have not been measured, the actual trajectory of the borehole is unknown, and the borehole within the pre-plugging range cannot be determined. The actual location, greatly increasing the difficulty of drilling plugging

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