Flexible pulverized coal foam concrete and its preparation method

Abstract

The invention discloses a flexible pulverized coal foam concrete and a preparation method thereof, relating to concrete. The main components of this concrete include: (by weight percentage) cement, 10-15; coal powder, 35-65; medium coarse sand, 20-45; water, 3-4.5; , 1~1.5. The method of using the concrete to block the wall of the coal seam roadway is either a shotcrete method, a lining concrete method, or a concrete curtain grouting method. The invention obtains materials locally, makes full use of the pulverized coal accumulated in the roadway drilled underground, reduces the transportation and construction costs of supporting materials, improves the efficiency and progress of coal mine excavation, and has little impact on the dilution of coal products; the structure is impermeable Good performance, good sealing and integrity; can be widely used in gas displacement coalbed methane roadway wall sealing and anti-seepage in coal mines, and complex rock formations or other dynamic pressure roadways with characteristics of softness, expansion, rheology, etc. Surrounding rock support.

Description

technical field [0001] The invention relates to concrete, in particular to a flexible pulverized coal foam concrete and a preparation method thereof. Background technique [0002] Gas displacement CBM technology is to inject gas (CO 2 , nitrogen, air, flue gas, etc.), use the injected gas to replace, drive, maintain pressure and increase permeability to promote the desorption of coalbed methane and drive the coalbed gas to the extraction borehole. The gas displacement coalbed methane technology can greatly increase the gas recovery rate, has the multiple effects of preventing and controlling gas disasters, reducing gas emissions, improving the utilization rate of coalbed methane, and increasing the efficiency of coal mining. It has important practical significance and long-term strategic significance. [0003] The migration of gas in the coal body requires two conditions, namely the pressure difference and the existence of fracture channels. The gas pressure difference con...

AI Technical Summary

Problems solved by technology

However, for the above-mentioned measures for the recovery roadway, the wall support of the blocked roadway will inevitably interfere with the mining, and the quality of the coal seam will be reduced.

Moreover, underground coal mines are often difficult to transport, and for conventional support processes, the cost of plugging is high, and it interferes with the progress of excavation or mining

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