动静组合载荷破岩声发射能量与破岩效果试验研究

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Abstract Crushing tests of brittle rock(granite) under different dynamic and static loads are conducted on multi-functional static-dynamic coupling loading testing apparatus. The acoustic emission system AEwin is applied to collect the acoustic emission data in the rock crushing process. Based on the measured data，the relationship between total acoustic emission energy and rock crushing volume under different loading patterns is analyzed. The rock crushing volume and rock-breaking specific energy are used as parameters which can characterize the rock breaking effect to synthetically analyse the effect of rock fragmentation under various kinds of loading patterns. The results show that：(1) There exists a close correlation between the total acoustic emission energy and crushing volume，and the relation of acoustic emission energy per breaking volume under dynamic loading，static loading and static-dynamic coupling loading is WD＜WS+D＜WS，where，WD，WS and WS+D are the acoustic emission energy per breaking volume under dynamic loading，static loading and static-dynamic coupling loading，respectively. (2) The total acoustic emission energy and crushing volume under static-dynamic coupling loading are more larger than that of dynamic loading or static loading；and there is an optimal loading combination which can make the total acoustic emission energy and rock-breaking volume both reach to the maximum but the rock-breaking specific energy to the minimum.

Key words： rock mechanics static-dynamic coupling loading fragmentation acoustic emission(AE) rock crushing effect

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http://www.rockmech.org/EN/Y2012/V31/I7/1363

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