The numerical modelling of slotted drilling in single coal seam based on DDA
Abstract：In order to carry out a further study on effect of ＂drilling-slotting-extraction＂ technology,based on the discontinuous analysis（DDA） method and the large deformation theory,the model of drilling-slotting-extracting was established.The ＂bottlenet effect＂ was further interpreted;the effect of slot height,slot width and tectonic stress was investigated.It shows that the effect of slot width can be ignored;as the increasing of slot height,the area of high ratio pressure relief will increase;and the increasing of tectonic stress may result in the ratio of pressure relief decreasing,so as the increasing of the tectonic stress,and the height can be increased.The multi-slot case was also computed.
Keywords：slotted drillingpressure reliefdiscontinuous deformation analysisslot
Publication Date：2011-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)