A static rock breaking flexible sleeve charging method
A flexible sleeve and rock-breaking technology, which is applied in earth-moving drilling, discharging machinery, etc., can solve the problems of static cracking agent slurry leakage and water conduction, and achieves light weight, good rock-breaking effect, and enhanced applicability. Effect
Active Publication Date: 2019-06-25
TAIYUAN UNIV OF TECH
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Problems solved by technology
[0006] The present invention aims at the problem that the prepared static cracking agent slurry will leak water through cracks when the static cracking agent static rock breaking technology is used on the broken rock mass with developed cracks, and provides a method that is applied to underground coal mines that are disturbed by excavation. A flexible sleeve charging method using static expansion cracking agent static rock breaking technology for broken rock masses with cracks that penetrate each other and extend to free space
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[0034] The present invention is further described in conjunction with examples.
[0035] In a mine, the 15# coal seam with an average thickness of 6.5m was mined using the fully mechanized top coal caving process. The strike length of the working face is 1329m, the dip length is 180m, and the average burial depth is 480m. The false roof of the 15# coal seam is thinner carbonaceous mudstone; the immediate roof is gray-black mudstone with an average thickness of 0.79m; the old roof is thicker, mainly composed of dark gray K2 limestone with an average thickness of 7.18m The compressive strength is about 50MPa. The excavation sections of the air inlet roadway and the air return roadway of the working face are both width×height=4700mm×4500mm, and the support form of “full anchor cable + anchor net” is adopted, and the arc-shaped triangular area at the end of the working face is temporarily supported by a single hydraulic prop form. When the fully-mechanized mining face is mined, ...
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The invention discloses a charging method for static force rock breaking by a flexible sleeve, and belongs to the technical field of a charging method for rock breaking with a static blasting agent. The problem of grout leakage and guiding water of broken rock mass with fracture development encountered in the practical rock breaking application of the static blasting agent in a coal mine shaft canbe solved. The charging method comprises the steps that a roll-shaped flexible sleeve is placed in a drill hole, the exposed end of the flexible sleeve is opened and a hole sealing device is put intothe flexible sleeve, and the exposed end of the flexible sleeve and the exposed end of the hole sealing device are flush with the hole opening of the drill hole; and after the hole sealing device seals the opening, the prepared static blasting agent slurry is injected into the flexible sleeve, the roll-shaped flexible sleeve is automatically expanded under the action of the static blasting agentslurry, the flexible sleeve fits perfectly with the wall of the drill hole in the radial direction, and the flexible sleeve extends axially towards the direction of the hole bottom of the drill hole until the reel end of the flexible sleeve reaches the hole bottom and the drill hole is filled with the static blasting agent slurry. The charging method for static force rock breaking by the flexiblesleeve solves the problem of grout leakage and guiding water of the broken rock mass with the fracture development encountered in the practical rock breaking application of the static blasting agent in the coal mine shaft, and the purpose of preventing fracture from leaking grout and guiding water is achieved.
Description
technical field [0001] The invention belongs to the technical field of static expansion cracking agent rock-breaking charging method, and in particular relates to a static rock-breaking flexible sleeve charging method used for poor integrity of borehole walls and preventing slurry leakage and water conduction in fissures of borehole walls. Background technique [0002] The static expansion cracking agent rock breaking process is to drill holes in the broken rock mass according to the design requirements, and fill the holes with the static expansion cracking agent slurry prepared according to the optimal water-cement ratio. The principle of action is the main component of the static expansion cracking agent The hydration reaction between CaO and water in the slurry produces Ca(OH) 2 After the reaction, the volume increases by about 2 to 3 times, and condenses in the borehole to form an elastic cylinder with expansion pressure. The expansion pressure generated by the volume ex...
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IPC IPC(8): E21C37/12
CPCE21C37/12
Inventor 郝兵元任兴云李丰亮李强王峰
Owner TAIYUAN UNIV OF TECH
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