Thin-layer limestone ground directional drilling horizontal multi-stage branch grouting drill hole

Abstract

The invention discloses a thin-layer limestone ground directional drilling horizontal multi-stage branch grouting drill hole. The thin-layer limestone ground directional drilling horizontal multi-stage branch grouting drill hole comprises a ground main hole. The ground main hole vertically extends to the underground, penetrates through a vertically-drilled straight hole section of a base rock layer from the ground to the underground and downwards penetrates through an ash consequently-drilled bedding section along a coal bed. A kickoff point is arranged at the end, away from the ground and close to the coal bed, of the straight hole section. Inclined drilling is conducted between the kickoff point and the middle of lime-cement-flyash below the coal bed, so that a directional inclination guide section is formed. The two ends of the directional inclination guide section communicate with the straight hole section and the bedding section correspondingly. The main hole bedding section is divided into a plurality of first and second stage branch holes distributed in a fan shape in the approximately horizontal direction of the bedding section. By adopting the technical scheme, compared with the former conventional water control technology, the safe reliability is greatly improved, deep mining bottom plate limestone water disaster governance is achieved, bottom plate water disaster accidents are avoided, and safety production is ensured.

Description

technical field [0001] The invention belongs to the field of coal mining, and more specifically, the invention relates to a horizontal multi-level branch grouting drilling hole for directional drilling on thin-bed limestone ground. Background technique [0002] In the prior art, the general method for preventing and controlling water damage is trial mining. According to the different hydrogeological conditions of a single working face, "drainage and depressurization, pressure-limited mining", "water-filling and utilization of water-resisting layer under pressure mining", and "floor grouting" were selected respectively. Various methods of water prevention and control such as "combined anti-pressure mining with water drainage and depressurization and grouting reinforcement", "full-scale grouting and reinforcement of the bottom plate and modified anti-pressure mining" were used for trial mining tests. The mining depth of the coal seam increases, the Taili karst water-bearing gr...

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Problems solved by technology

[0002] In the prior art, the general method for preventing and controlling water damage is trial mining. According to the different hydrogeological conditions of a single working face, "drainage and depressurization, pressure-limited mining", "water-filling and utilization of water-resisting layer under pressure mining", and "floor grouting" were selected respectively. Various methods of water prevention and control such as "combined anti-pressure mining with water drainage and depressurization and grouting reinforcement", "full-scale grouting and reinforcement of the bottom plate and modified anti-pressure mining" were used for trial mining tests. The mining depth of the coal seam increases, the Taili karst water-bearing group and the Austrian ash strong aquifer have strong water-richness and high water pressure, and it is difficult to find out the vertical strong runoff zones such as karst collapse columns and fault fracture zones. In mining practice, even It is also difficult to effectively prevent floor karst water damage by implementing full-section grouting reinforcement of the working face. During the mining process of floor karst, once a water seepage accident occurs, the working face will be completely shut down

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