Browsing by Subject "reducing rock-bump hazard with active methods"

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Access status: Open Access ,
Metoda udarowego hydraulicznego szczelinowania górotworu za pomocą strzelań odpalanych w otworach wypełnionych wodą pod ciśnieniem w aspekcie zwalczania zagrożenia tąpaniami
(Wydawnictwa AGH, 2005) Krawiec, Alfons
Ali methods of reducing rock-bump hazard in our coalmines are important and up-to-date and as such should be permanently and consistently developed and improved using the latest achievements in science and mining technology in this field. This applies particulary to combating rock-bump with active methods. The author discussed in details selected comments on methods of active rock-bump hazard reduction with shock blasting and infusion of water under pressure into the rock mass indicating their Iow effectiveness and reliability. Hence, the author proposed radical solution of this problem consisting in aggressive increase of applying technical means to rock mass. This aim was achieved by combining into one procedure two methods of active rock-bump hazard reduction that were used separately so far, that is shock blasting and forcing water under pressure. The original method of active reduction of rock-bump hazard established in this way was called the method of percussive hydraulic fracturing of rock mass with blasting fired in blast holes filled with water under pressure. The essence and mechanism of this method were described in details. The method under discussion applied for methane drainage of the seam 501/510 in »Wesoła« Coal Mine produced sensational results, that is fifteen fold increase of methane emission from methane drainage borehole, keeping the same conditions during the time of conducting the experiment. Therefore the author of this paper proposes to apply this method also to reducing rock-bump hazards.