DOI: 10.11799/ce201704014
Parameter optimization design of roof-weakening blastingbased on PPV safety criteria
XU Xuan
XU Ying
FU Ju-gen
WANG Hai-bo
ZHENG Zhi-tao
Abstract：Aiming at the problem of hard roof weakening in fully mechanized coal mining face under high geostress,LS-DYNA was applied to simulate the explosive stress wave in rock mass and the time history curve of blasting vibration with a initial geostress of 20MPa and the lateral pressure coefficient of 0.5,based on the engineering background of 3245 working face in Qidong Coal Mine.And the peak stress and velocity with the attenuation law of pitch was studied.With the introduction of the initial stress correction coefficient of PPV safety criteria of fracture zone radius,the result shows that damage effect of roof rock is favorable when the blasthole spacing is less than 13.4m blasting,and the research conclusion is verified through field application.
Keywords：PPV safety criteriaroof weakeningblasting parametersinitial geostressnumerical simulation
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：3( 43-45 )