Research On Deep-hole Blasting Rockburst Prevention Technique In NO.11Coal Mine Of Pingdingshan

As coal mining transfer to deep area day by day， the rockburst dynamicphenomenon caused by high stress in stope appears more frequently。The mining depthof main active coal seam has reached900m in NO.11coal mine，and during process ofcoal winning，it’s very easily to engender high stress area when the weight of hangingrock move to the coal above working face。Therefore，this thesis on the basis ofclassical blasting theory and intensity weakening theory for rockburst，analysed therockburst prevention mechanism of relieving shot by deep-hole blasting，and putforward using the deep-hole blasting technology to eliminate local stress concentrationconditions in front of working face。According to this research，the beneficialachievements were obtained as follow：（1）By way of gathering the dynamic phenomenon materials in the past yearsabout NO.11coal mine in Pingdingshan，and analysing the reason why the dynamicphenomenon will come about and various impact factors。（2）By way of testing the coal seam rockburst tendency in working face，theresults concluded that the coal seam have weak rockburst tendency。Combined thecomprehensive index method to evaluate the shock hazard of JI16-17-22161，the resultsshowed that it has moderate rockburst dangerous。Meanwhile，measured the position ofadvance supporting pressure peak in working face，and differentiated the range of highstress dangerous area。（3）The numerical simulation software has been applied to simulate the influenceabout values and positions of advance supporting pressure peak in working face，andfixed the rational charge position was behind advance supporting pressure peak in coalface。Then simulated blasting effect under the condition of different charge weight，andfind out that the reasonable charge weight was1.5times of basic model。On this basis，work out the rockburst prevention scheme of relieving shot by deep-hole blasting。（4）The drilling method and electromagnetic radiation method has been applied toverify the effect of relieving shot by deep-hole blasting，and the results indicated thatthe programme obtained a very well effect。Simultaneously，it proved that the computersimulation and testing scene results were congruity，and the computer simulation research could provide beneficial guidance for testing scene work。...