Mining coal dust based hole-sealing and grouting material, and preparation hole-sealing process

Abstract

The invention relates to a mining coal dust based hole-sealing and grouting material. The mining coal dust based hole-sealing and grouting material consists of the following materials in parts by mass: 15.87 to 28.65 percent of coal dust, 28.65 to 31.75 percent of an adhesive, 0.48 to 0.93 percent of a crosslinking agent, 3.17 to 6.17 percent of an enhancer, 0.32 to 0.62 percent of an expanding agent, 0.14 to 0.63 percent of a flexibilizer, 0.16 to 0.57 percent of a coupling agent and the balance of water. The preparation hole-sealing process comprises four steps of screening the coal dust, mixing the materials primarily, mixing for the second time and performing hole-sealing operation. According to the grouting material, on one hand, the whole combining property of the structure, the compaction, blockage and leak blocking effects, and the weather tolerance of the grouting material are effectively improved, and on the other hand, the pulverized coal at the periphery of a drill hole can adhere to each other again to form a continuous whole body, the drilling stability is improved, the construction process of the drilling hole-sealing construction is greatly retarded while the dust pollution in the drilling construction operation field can be reduced, on-site construction operation is facilitated, the flexibility and the reliability of the drilling hole-sealing operation are improved, and wide application prospect is achieved.

Description

technical field [0001] The invention relates to a mining coal dust-based sealing grouting material and a preparation sealing process, belonging to the technical field of grouting materials. Background technique [0002] Borehole gas drainage can quickly reduce coal seam gas pressure and gas content, and eliminate the risk of coal seam outburst. It is the most effective technical measure to control coal mine gas disasters, and the extracted gas can also be used as clean fuel. The quality of borehole sealing is the key to determine the effect of gas drainage. If the sealing material cannot fully seal the borehole, it will lead to gas leakage in the borehole drainage, reduce the efficiency of gas drainage, and even have the hidden danger of gas drainage pipeline explosion. . Because of the traditional sealing materials, the cement mortar material is easy to shrink and crack after curing; the polyurethane material foams too fast, the operation is not easy to control, and it sof...

AI Technical Summary

Problems solved by technology

The quality of borehole sealing is the key to determine the effect of gas drainage. If the sealing material cannot fully seal the borehole, it will lead to gas leakage in the borehole drainage, reduce the efficiency of gas drainage, and even have the hidden danger of gas drainage pipeline explosion.

Because of the traditional sealing materials, the cement mortar material is easy to shrink and crack after curing; the polyurethane material foams too fast, the operation is not easy to control, and it softens and shrinks when it meets water after curing; the mucus sealing material is easy to leak through the cracks around the drilling hole, and the sealing hole cost is higher

Due to the above defects of traditional sealing materials, the sealing effect is not ideal, and it is difficult to fully pre-pump the gas existing in the coal seam, which still has hidden dangers to the safe production of coal mines. Therefore, to solve this problem, it is urgent to develop a new Drilling plugging grouting material and corresponding preparation sealing process to meet the needs of actual use

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