ENERGY ABSORPTION OF ROCK FRAGMENTATION UNDER IMPULSIVE LOADS WITH DIFFERENT WAE FORMS

来源期刊：中国有色金属学报(英文版)1993年第1期

论文作者：Li Xibing Lai Haihui Gu Desheng

文章页码：1 - 5

Key words：rock fragmentation; dynamics; stress wave; dissipation and economization of energy

Abstract: In order to investigate the effects of stress waveforms on energy dissipation and the degree of fragmentation of rock. SHPB experiments on rock using rams with different structures and geometries have been performed. The efficiency of energy absorption and post-fragmentation grain sizes under diffferent loading conditions have been determined. The results show that both energy absorption and the degree of fragmentation of rock are related to the shapes of incident stress waves. From the view of energy economization. the approximately symmetric bell-shaped pulse produced by a truncated cone ram is apparently superior to an exponentiallyattenuation pulse provided that the incident energy is great enough to fragment the rock. But no matter what the intensities and shapes of the loading pulses are. the maximum energy absorption of rock can not be more than 50％ of the incident energy.