1)Directional throw blasting定向抛掷爆破 1.And more,an example of directional throw blasting with the Line of least resistance-25m, near the country boundary is given.根据实际经验对影响大爆破抛掷效果的若干因素:如药包配置、地形条件、起爆顺序、最小抵抗线、爆破作用指数、药包间距和抛掷角等进行了论述...
This system combines memory logging with a novel deployment system that yields a cost effective approach to obtaining high quality formation evaluation data. Obtained post-drilling, the shuttle system conveys memory logging tools rapidly to TD inside the drillpipe as part of a wiper trip or check ...
This system combinesrnmemory logging with a novel deployment system that yields arncost effective approach to obtaining high quality formationrnevaluation data. Obtained post-drilling, the shuttle systemrnconveys memory logging tools rapidly to TD inside therndrillpipe as part of a wiper trip or ...
Directional long drilling on the roof is an effective gas control measure in the goaf, but there is little research on the stability of the surrounding rock. In this study, the geological conditions of the #4 coal seam in the Tingnan Coal Mine, Shaanxi Province, China taken as the applicat...