Energy consumption in rock fragmentation at intermediate strain rate

来源期刊：中南大学学报(英文版)2009年第4期

论文作者：洪亮 周子龙 尹土兵 廖国燕 叶洲元

文章页码：677 - 683

Key words：rock; large-diameter SHPB test; intermediate strain rate; energy consumption density; fragment distribution; dynamic strength

Abstract: In order to determine the relationship among energy consumption of rock and its fragmentation, dynamic strength and strain rate, granite, sandstone and limestone specimens were chosen and tested on large-diameter split Hopkinson pressure bar (SHPB) equipment with half-sine waveform loading at the strain rates ranging from 40 to 150 s^-1. With recorded signals, the energy consumption, strain rate and dynamic strength were analyzed. And the fragmentation behaviors of specimens were investigated. The experimental results show that the energy consumption density of rock increases linearly with the total incident energy. The energy consumption density is of an exponent relationship with the average size of rock fragments. The higher the energy consumption density, the more serious the fragmentation, and the better the gradation of fragments. The energy consumption density takes a good logarithm relationship with the dynamic strength of rock. The dynamic strength of rock increases with the increase of strain rate, indicating higher strain rate sensitivity.

基金信息：the National Natural Science Foundation of China