Open AccessExperimental Study on Presplitting Blasting of Roof Cutting Along Goaf with Thick and Hard Roof Plate
Author(s) -
Jianquan Tang,
Hongliang Liu,
Anfa Chen
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/692/2/022089
Subject(s) - roof , rock blasting , drilling , geotechnical engineering , coal mining , mining engineering , coal , structural engineering , engineering , geology , mechanical engineering , waste management
In order to explore the reasonable blasting parameters of the gob-side entry retaining technology under the specific conditions of thick and hard roof, and realize successful roof cutting and safe roadway retaining, the thick and hard roof of the XV1306 working face in the first panel of Yixin Coal Mine is used as the research background. The drilling parameters of blasting are analyzed, which contains the depth of slitting, angle of slitting and spacing of blasting holes. And the influence of charge structure and charge amount on the effect of presplitting blasting was studied through underground blasting tests. The results show that when the blast hole depth is 10m, the drilling angle is 15°, and the blast hole spacing is 500 mm, with adopting the “2+3+4+4+3+2” method to the deep-hole charge structure, the top-cut crack rate is more than 90%. the penetration effect of top-cut crack is good, which can meet the needs of roof cutting for pressure relief and control of surrounding rock in roadway retaining.