摘要
为得出顶板裂隙通道的演化过程和空间分布特征,以岩体力学和煤岩全应力-应变过程中瓦斯流动变化规律为理论基础,采用深部位移自动监测仪和裂隙通道巡回摄录仪,进行理论分析和现场测试研究,得出了瓦斯裂隙通道形成判据和分布特征。结果表明:煤岩分层成为瓦斯裂隙通道边界需要满足其变形小于下分层或大于上分层,同时其稳定跨距大于顶板悬露距离,据此判别出试验矿区顶板浅部主干裂隙通道位于顶板上方1.5,5.0 m处;随工作面推进,顶板裂隙通道经历原生裂隙通道主导阶段、裂隙通道产生、扩张、成熟和闭合阶段的演化过程,重新压实区至工作面前方原岩应力区距离与工作面日推进速度的比值为裂隙通道的演化周期,试验矿区演化周期为11～14 d。
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.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2012年第9期1451-1455,共5页
Journal of China Coal Society
基金
国家重点基础研究发展计划(973)资助项目(2011CB201204)
国家自然科学基金煤炭联合基金资助项目(51134018)
关键词
裂隙通道
演化规律
分布特征
自动监测仪
巡回摄录仪
变形判据
fracture channel
evolution law
distribution characteristic
automatic monitor
tour video recording instru-ment
deformation criterion
