School of Civil and Resource Engineering;
University of Science and Technology Beijing;
Beijing 100083;
China;
Key Laboratory of High-Efficient Mining and Safety of Metal Mines(Ministry of Education of China);
University of Science and Technology Beijing;
Beijing 100083;
China;
Beijing Key Laboratory of Urban Underground Space Engineering;
University of Science and Technology Beijing;
Beijing 100083;
China;
rock; mechanics; circular; opening; opening; size; uniaxial; compression; acoustic; emission;