Construction method of consolidating horizontal directional drilling hole by grouting coal seam baseboard

Abstract

The invention relates to a construction method of consolidating horizontal directional drilling holes by grouting a coal seam baseboard. Along with the continuous extension of coal mining depth and the continuous enlargement of the mining range, crustal stress is enlarged, and the number of abnormal geologic bodies is gradually increased, water pressure is gradually enhanced, hydrogeologic conditions become more and more complex, and water-inrush threat becomes more and more serious. The construction method provided by the invention comprises the following steps of: drilling holes in a coal seam by developing a drill field in a coal heading of a working surface, wherein the drilling direction points to a water resisting layer and a water bearing layer of the coal seam baseboard; rotatably drilling the coal seam baseboard for a certain depth to carry out hoist drilling and broaching, installing a primary hole sealing sleeve to seal the hole by grouting, cleaning the bottom of the hole after the grout is solidified; and then consolidating the hole by a primary sleeve, consolidating the hole by a secondary sleeve, and carrying out directional drilling to make the drilling hole extend along a preset consolidating layer according to the designed track to finally form the drilling hole. In the invention, the entire consolidation of the coal seam baseboard of the regional working surface is realized through designing the drilling hole track, determining the drilling hole consolidating radius and reasonably arranging the directional drilling according to the analysis to the water resisting layer and the water bearing layer.

Description

technical field [0001] The invention belongs to the field of mining, and in particular relates to a construction method for grouting and reinforcing horizontal directional drilling on a coal seam floor. Background technique [0002] With the continuous extension of coal mining depth and the continuous expansion of mining area, the ground stress increases, geological anomalies also gradually increase, water pressure gradually increases, hydrogeological conditions become more and more complex, and the threat of water inrush becomes more and more serious . If the water inrush is frequent and the amount of water inrush is large, it will seriously affect the safe production of coal mines. [0003] The water prevention and control technology of grouting in the coal seam floor aquifer is mainly to detect the water-proof and weak areas of the aquifer in the coal seam floor, to strengthen the floor aquifer by grouting, to block the water inrush channel of the floor, to strengthen th...

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Problems solved by technology

[0004] The existing coal seam floor reinforcement technology adopts ordinary rotary drilling, the inclination angle and azimuth angle of the opening are fixed, the holes are basically straight holes, and the drilling trajectory is uncontrollable, so the distance through the aquifer is short The grouting section is short, resulting in poor grouting effect, low utilization rate of the borehole, high construction cost, and when the borehole encounters an aquifer, the coordinates of the borehole trajectory cannot be calculated, and the location of the aquifer cannot be determined. location, which seriously affects the effect of drilling and grouting reinforcement

The patent application number is 200810050051.X, and the Chinese patent publication number is CN 101608552A: a method for strengthening the aquifer of the coal seam floor and protecting the water-resisting layer during the reinforcement process, using high-inclination drilling, and the included angle α is 20°-90°, At the same time, the pressure of the grouting final hole is controlled below 2 times of the hydraulic pressure of L8 limestone to minimize the damage to the aquifer. A good floor reinforcement effect requires intensive drilling, which results in a large amount of drilling work and high construction costs. At the same time, it increases the alternate time of mining in the coal mine working face, which seriously affects the production progress of the coal mine.

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