bead face meaning in Chinese

胎圈正面

For avoiding the occurrence of explosion - related accidents , the author presents an introduction to the safety regulations that should be observed . these includes the check of gas concentration before charge and initiation and after blasting , the adoption of interlocked blasting system , indirect blasting , initiation by stages at coal and beading faces , use of water stemming , shallow - hole balsting , blasting earning and safety distance
为了防止在井下爆破中引起事故,对一炮三检制和联锁爆破制,反向爆破作业,采煤、掘进工作面的分次起爆作业,水炮泥的使用,浅眼爆破作业,爆破警戒和爆破安全距离等安全规定进行介绍和分析。