Flexible coal powder foam concrete and preparation thereof

Abstract

The invention discloses a flexible coal dust foam concrete and a method for preparing the same, and in particular relates to a concrete. The concrete comprises the following main components by weight percentage: 10 to 15 percent of cement; 35 to 65 percent of coal dust; 20 to 45 percent of medium coarse sand; 3 to 4.5 percent of water; 0.1 to 0.3 percent of waterproofing agent; and 1 to 1.5 percent of foaming agent. A mode for blocking the wall surface of a heading by using the concrete is a concrete spraying mode, or a concrete lining mode, or a concrete curtain grouting mode. The flexible coal dust foam concrete is prepared from local materials, makes full use of the coal dust accumulated in the heading by underground drilling to reduce the transportation and construction cost of a supporting material and improve the efficiency and the progress of coal mining excavation, and has small impoverishment effect on coal products; a structural body has excellent impermeability, good leakproofness and integrity; besides, the concrete can be widely used for blocking and preventing seepage for the wall surface of a gas displacement coal-bed methane gas tunnel in coal mines, and also can be applied to supporting surrounding rocks of complex rock stratums or other dynamic pressure tunnels with the characteristics of softness, expansion, rheological performance and the like.

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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