期刊
SAFETY SCIENCE
卷 115, 期 -, 页码 215-228出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ssci.2019.02.011
关键词
Mine safety; Rockburst; Laboratory test; Acoustic emission; Safety control
资金
- National Natural Science Foundation of China [51474207]
As one of coal mine dynamic disasters, rockbursts generally result in abrupt displacements and unpredictable coal rock failures with disastrous consequences and pose serious threats to mine health and safety all over the world. To improve mine safety, this work investigated the disaster-inducing mechanism and safety-control measures of rockburst. Laboratory dynamic cyclic loading tests were used along with a high-speed camera to capture the bursting failure of coal which was used to characterize this disaster evolution. Acoustic emission data were acquired. By adopting the velocity tomography technique, these data were used to inverse the spatial stress distribution inside the coal at different loading stages. It was found that there are many localised areas with different degrees of stress concentration inside the coal. The failure process of coal consists of several stages of bursting damage with violent ejection of broken coal material. The bursting damage is likely to occur in areas characterized by high stress concentration and dense micro-cracks, and is attributed to the inhomogeneous accumulation and unstable release of elastic energy. Rockbursts can be weakened or avoided by reducing stress concentration and controlling energy release intensity. Application of safety-control measures including destress boreholes and destress blasting have achieved good prevention effects.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据