Open AccessResearch on Characteristics and Laws of Fracturing Dust Production in Deep Coking Coal with Similar Material Structure
Author(s) -
Wenbin Zhao,
Liang Song,
Qing Liu,
Qiao Shancheng,
Lu Jiyu,
Jinfeng Wang
Publication year - 2019
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/371/4/042048
Subject(s) - coal , materials science , deformation (meteorology) , compressive strength , fracture (geology) , gypsum , composite material , waste management , engineering
The coking coal under the influence of the earth stress is easily broken in the mining process, the dust production is large, the particle size is small, and the dust is serious. Considering the characteristics of primary coal dust, the ratio of similar materials is determined by experiment of single axial compressive strength. By means of acoustic emission detection device, uniaxial compression test is carried out for the coking coal similar materials in different structural forms, and the characteristics of fracture development and dust production of the primary dust are studied. The experimental results show that: pulverized coal: gypsum: cement is 0.81:1:1 and 0.2:1:1 the compressive strength of similar materials is 3.5 mpa and 1.5mpa, which meets the test requirements. The regularity of structural pressure of similar material is shown, similar materials with smaller strength and heavy loading deformation, however, the fracture and fracture development, the primary dust production is large. When the axial pressure is low, the low-intensity similar coal test block is vulnerable to crushing deformation at the upper part, the lower high strength coal needs to be damaged when the force is larger.