Evolution and distribution characteristics of roof shallow fissure channel
Abstract：In order to figure out evolutionary process of roof fissure channel and spatial distribution characteristics, based on rock mechanics and gas flow variation of coal and rock stress-strain process, using deep displacement auto- matic monitor and fissure channel itinerant video camera, theoretrieal analysis and field testing were done and the for- mation criterion of gas fissure channel and distribution characteristics were obtained. The results show that the coal- rock stratification becomes gas fissure channel when the transformation is smaller than lower stratification or bigger than upper stratification and the stable span must be bigger than roof exposure length, according to this, the roof shal- low fissure channel of test mine is located 1.5 m and 5.0 m above the roof;with working face promoting,roof fissure channel goes through an evolutionary process:pre-existing fissures channel dominant stage and fissure channel pro- duce-expand-mature-close stage, the evolutionary cycle of fissure channel is the ratio of the distance between re-com- paction area and initial stress area in front of working face and the promoting speed per day, and the evolutionary cycle of test mine is 11-14 days.
Keywords：fracture channelevolution lawdistribution characteristicautomatic monitortour video recording instru-mentdeformation criterion
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 1451-1455 )