Dynamic gangue concrete used for filling beside gob-side entry retaining

Abstract

The invention discloses a dynamic gangue concrete for filling beside gob-side entry retention, which is composed of 1000 parts of gangue with a particle size of less than 1.5 cm, 200 parts of ordinary Portland cement, 100 parts of fly ash from a power plant, and 3 hydration agents. part, 2 parts of internal curing agent, 50 parts of non-alkali liquid quick-setting agent and 500 parts of water are uniformly stirred and mixed; the above-mentioned parts all refer to parts by weight; The compressive strength is 6-9Mpa, and the uniaxial compressive strength at 28-day age is 16-24Mpa, which can fully meet the support requirements of gob-side entry retaining.

Description

technical field [0001] The invention relates to a kind of concrete, which is especially suitable for coal mine non-coal pillar mining-power gangue concrete used for filling beside gob-side entry retention. Background technique [0002] After the coal mining face has been mined, the roadway in the section (or lower section) on the original working face is reserved and used when the adjacent working face is mined. The remaining roadway is called gob-side entry retention. After the working face of the upper section of the mining area has been mined, the roadway left along the goaf can be used as a return airway when the working face of the lower section is mined. [0003] The gob-side roadway is located at the edge of the goaf, and the roadway will be affected by the mining of the upper section of the working face during the preservation of the roadway, and there must be roadside support on the side near the goaf. Therefore, in addition to the basic support of the roadway and ...

AI Technical Summary

Problems solved by technology

[0004] In addition, a large amount of gangue should be removed during the excavation of coal mining roadway (the output of gangue is about 10% of coal output, and the amount of gangue newly produced and piled on the surface every year is about 150-300 million cubic meters 3 ), waste rocks are discharged to the ground for disposal, and are often piled up in coal mines to form gangue hills, occupying a large area of ​​land, producing various toxic and harmful gases, polluting the atmospheric environment, and prone to landslides and other geological disasters during the rainy season