Bored Of Pressure Relief Mechanism And A Reasonable Argument

With the increasing depth of coal mining, as the result of more roadway and stess of surrounding rock, Shock pressure disasters happen more easily. When the depth reaches a certain threshold,many of the mines in china has a certain degree of iMPact dangerous tendency. In recent years,impact has become more and more serious, turning into a major obstacle of safety production in coal mine.Pressure technology is a advanced technology.Which is helpful to reduce the range of the high stress value and the high stress area above and surrounding rock roadway, transfer the high stress area and high stress into the deep coal,and make the a Stress heighten area into stress by area.Therefore, researching diameter bored roof-floor giambi mechanism and reasonable parameters is very necessary.Mechanical analysis of the large diameter drilling pressure relief mechanism is to eliminate or reduce the risk of rock deformation in drilling methods Drilling around the coal can produce fracture and damage occurs under high-stress, and the fracture make a diameter larger than the rupture zone. So a larger internal pressure relief rupture zone forms,after the single ruptured zone connects between each other and then stress peaks reduces and transfers to deep coal,helping to reduce pressure.In this paper,I decide to make a research on relaxed parameters for large diameter,such as hole diameter, hole spacing, hole layout and drilling depth of the numerical simulation with FLAC,hoping to obtain reasonable relief drilling parameters and provide a reliable guide for the specific application of borehole pressure technology.With FLAC which is a large-scale simulation software, I simulate the depth of 600m and 1000m depth under two different depths and different drill hole diameter on the effect of pressure relief is obtained, drilling holes, the holes on both sides stress concentration around the hole damage, the formation of stress reduced area, regardless of the size of hole diameter, there is some relief to do with. As the hole diameter increases, the tunnel effect of getting better and better relief, more than 0.3m in diameter, the pressure relief area between the roadway began drilling interconnected into a larger relief area, can achieve better relief effect, but in reality, the hole diameter is too large, it will affect the integrity of surrounding rock, and when drilling the phenomenon of sticking more and more difficult to increase the construction and engineering costs.FLAC through the application of large-scale simulation software to simulate the depth of 600m and 1000m depth under two different depths, different hole spacing on the effect of pressure relief hole, draw, drill hole spacing of relief effect is an important parameter. And when the smaller drill hole spacing the better. As the depth increases, the pressure of coal, drilling relief effect of getting better.By numerical simulation of the Tang mouth km deep, typical roadway high stress relief drilling large diameter pressure relief mechanism and drilling reasonable parameters for the typical big mouth Don depth, high stress, the impact of the serious risk of dangerous roadway design provides the basis for discharge.Analysis and study of the pressure technology for large-diameter bored concrete practice of Dongtan Coal Mine, obtained relief as a bored tunnel lift the risk of high stress measures are feasible, and the advantages can drill down to the ten high-pressure zone, relief effective, flexible and reliable, the higher the pressure, relief the better. Coal seam in poor conditions apply.